Built 2026-10-18 (18 October 2026)

Harrisburg Weather Records (USC00113879)

Record envelope, standing records and threshold days for Harrisburg (USC00113879), Illinois, United States, with 129 years of record.

Key Facts for Harrisburg

  • Harrisburg (USC00113879) is a weather station in Illinois, United States at 37.74 latitude and -88.52 longitude, 111 m (365 ft) above sea level.
  • The station reports from 1898 to 2026, 129 years of record.
  • 1,464 records set at Harrisburg still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Harrisburg set a daily record precipitation of 36.8 mm (1.4 in) on 10 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Illinois, United States, 37.74 latitude, -88.52 longitude.
  • Elevation: 111 m (365 ft).
  • Period of record: 1898 to 2026, 129 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

1 days at or beyond a record
Daily record high and record low at Harrisburg, with 2026 drawn through them The band shows the record high and record low for each calendar day at Harrisburg. The lines show the 2026 daily maximum and minimum. 1 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Harrisburg. The lines show the 2026 daily maximum and minimum. 1 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Harrisburg, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan25.6 C (78.1 F)-30.0 C (-22.0 F)19.4 C (66.9 F)-17.8 C (0.0 F)
Feb26.7 C (80.1 F)-30.6 C (-23.1 F)22.8 C (73.0 F)-14.4 C (6.1 F)
Mar34.4 C (93.9 F)-22.2 C (-8.0 F)31.1 C (88.0 F)-7.2 C (19.0 F)
Apr35.6 C (96.1 F)-5.6 C (21.9 F)29.4 C (84.9 F)1.7 C (35.1 F)
May37.8 C (100.0 F)-2.2 C (28.0 F)30.6 C (87.1 F)2.2 C (36.0 F)
Jun41.1 C (106.0 F)4.4 C (39.9 F)33.3 C (91.9 F)11.1 C (52.0 F)
Jul45.0 C (113.0 F)7.2 C (45.0 F)35.6 C (96.1 F)15.0 C (59.0 F)
Aug43.9 C (111.0 F)5.0 C (41.0 F)36.7 C (98.1 F)13.3 C (55.9 F)
Sep42.8 C (109.0 F)-5.0 C (23.0 F)n/an/a
Oct36.7 C (98.1 F)-7.8 C (18.0 F)n/an/a
Nov30.6 C (87.1 F)-19.4 C (-2.9 F)n/an/a
Dec25.6 C (78.1 F)-23.9 C (-11.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Harrisburg by the year they were set 1,464 records at Harrisburg still stand. 1925 holds the most, with 36. 0102030401898: 171899: 331900: 111901: 301902: 171903: 171904: 111905: 101906: 181907: 191908: 61909: 161910: 161911: 331912: 101913: 251914: 201915: 201916: 101917: 271918: 251919: 41920: 61921: 71922: 101923: 141924: 211925: 361926: 81927: 241928: 171929: 171930: 341931: 161932: 101933: 151934: 211935: 121936: 311937: 91938: 111939: 121940: 181941: 41942: 101943: 151944: 51945: 91946: 61947: 71948: 81949: 61950: 211951: 151952: 221953: 211954: 111955: 141956: 71957: 71958: 51959: 61960: 191961: 61962: 141963: 161964: 161965: 81966: 141967: 151968: 71969: 51970: 81971: 41972: 91973: 41974: 111975: 51976: 131977: 61978: 41979: 71980: 111981: 51982: 141983: 121984: 61985: 131986: 141987: 31988: 51990: 41991: 121992: 101993: 91994: 91995: 71996: 161997: 151998: 81999: 52000: 82001: 112002: 52003: 52004: 82005: 12006: 72007: 32008: 102009: 122010: 32011: 52012: 102013: 22020: 12021: 112022: 112023: 52024: 112025: 132026: 101898191119241937195019631976199020032022
1,464 records at Harrisburg still stand. 1925 holds the most, with 36.
Standing records at Harrisburg by the year they were set
Year setStanding records
189817
189933
190011
190130
190217
190317
190411
190510
190618
190719
19086
190916
191016
191133
191210
191325
191420
191520
191610
191727
191825
19194
19206
19217
192210
192314
192421
192536
19268
192724
192817
192917
193034
193116
193210
193315
193421
193512
193631
19379
193811
193912
194018
19414
194210
194315
19445
19459
19466
19477
19488
19496
195021
195115
195222
195321
195411
195514
19567
19577
19585
19596
196019
19616
196214
196316
196416
19658
196614
196715
19687
19695
19708
19714
19729
19734
197411
19755
197613
19776
19784
19797
198011
19815
198214
198312
19846
198513
198614
19873
19885
19904
199112
199210
19939
19949
19957
199616
199715
19988
19995
20008
200111
20025
20035
20048
20051
20067
20073
200810
200912
20103
20115
201210
20132
20201
202111
202211
20235
202411
202513
202610

All-Time Record Progression

6 new records
When Harrisburg set new all-time records 6 all-time records were set at Harrisburg between 19 July 1930 and 18 March 2008. Each dot is a new record. Record high minimum temperatureRecord high maximum temperatureRecord daily snowfallRecord low minimum temperatureRecord daily precipitation19 July 1930: Record high minimum temperature 31.7 C (89.1 F)13 July 1936: Record high maximum temperature 45.0 C (113.0 F)27 March 1947: Record daily snowfall 38.1 cm (15.0 in)2 February 1951: Record low minimum temperature -30.6 C (-23.1 F)22 May 1957: Record daily precipitation 187.5 mm (7.4 in)18 March 2008: Record daily precipitation 254.0 mm (10.0 in)19301940195019601970198019902000
6 all-time records were set at Harrisburg between 19 July 1930 and 18 March 2008. Each dot is a new record.
When Harrisburg set new all-time records
DateKindDetail
1930-07-19Record high minimum temperatureRecord high minimum temperature 31.7 C (89.1 F)
1936-07-13Record high maximum temperatureRecord high maximum temperature 45.0 C (113.0 F)
1947-03-27Record daily snowfallRecord daily snowfall 38.1 cm (15.0 in)
1951-02-02Record low minimum temperatureRecord low minimum temperature -30.6 C (-23.1 F)
1957-05-22Record daily precipitationRecord daily precipitation 187.5 mm (7.4 in)
2008-03-18Record daily precipitationRecord daily precipitation 254.0 mm (10.0 in)

Wettest Day of Each Month

Mar: 254.0 mm (10.0 in)
Record daily precipitation for each month at Harrisburg The wettest day on record for each calendar month at Harrisburg. The most was 254.0 mm (10.0 in) on 18 March 2008. 0100200300 Jan: 97.5 mm (3.8 in), 14 January 1937 Jan Feb: 86.4 mm (3.4 in), 6 February 2008 Feb Mar: 254.0 mm (10.0 in), 18 March 2008 Mar Apr: 146.1 mm (5.8 in), 29 April 1996 Apr May: 187.5 mm (7.4 in), 22 May 1957 May Jun: 125.7 mm (4.9 in), 26 June 2011 Jun Jul: 109.2 mm (4.3 in), 21 July 1905 Jul Aug: 171.5 mm (6.8 in), 17 August 1959 Aug Sep: 108.5 mm (4.3 in), 23 September 2006 Sep Oct: 138.9 mm (5.5 in), 5 October 1910 Oct Nov: 114.3 mm (4.5 in), 17 November 1921 Nov Dec: 135.1 mm (5.3 in), 3 December 1982 Dec
The wettest day on record for each calendar month at Harrisburg. The most was 254.0 mm (10.0 in) on 18 March 2008.
Record daily precipitation for each month at Harrisburg
MonthRecord daily precipitation (mm)Date
Jan97.5 mm (3.8 in)14 January 1937
Feb86.4 mm (3.4 in)6 February 2008
Mar254.0 mm (10.0 in)18 March 2008
Apr146.1 mm (5.8 in)29 April 1996
May187.5 mm (7.4 in)22 May 1957
Jun125.7 mm (4.9 in)26 June 2011
Jul109.2 mm (4.3 in)21 July 1905
Aug171.5 mm (6.8 in)17 August 1959
Sep108.5 mm (4.3 in)23 September 2006
Oct138.9 mm (5.5 in)5 October 1910
Nov114.3 mm (4.5 in)17 November 1921
Dec135.1 mm (5.3 in)3 December 1982

Period of Record Coverage

1898 to 2026
Days with data per year at Harrisburg 123 years of record at Harrisburg, 1898 to 2026. 19 years have data for under 90 percent of days and are left out of rankings: 1898, 1916, 1919, 1988, 1990, 2002, 2003, 2004 and others. 1898: 304 of 365 days1899: 362 of 365 days1900: 363 of 365 days1901: 365 of 365 days1902: 365 of 365 days1903: 365 of 365 days1904: 365 of 366 days1905: 365 of 365 days1906: 365 of 365 days1907: 361 of 365 days1908: 365 of 366 days1909: 364 of 365 days1910: 365 of 365 days1911: 365 of 365 days1912: 361 of 366 days1913: 364 of 365 days1914: 363 of 365 days1915: 364 of 365 days1916: 308 of 366 days1917: 335 of 365 days1918: 359 of 365 days1919: 251 of 365 days1920: 335 of 366 days1921: 360 of 365 days1922: 353 of 365 days1923: 362 of 365 days1924: 364 of 366 days1925: 355 of 365 days1926: 362 of 365 days1927: 360 of 365 days1928: 362 of 366 days1929: 359 of 365 days1930: 345 of 365 days1931: 349 of 365 days1932: 359 of 366 days1933: 364 of 365 days1934: 365 of 365 days1935: 365 of 365 days1936: 335 of 366 days1937: 365 of 365 days1938: 364 of 365 days1939: 365 of 365 days1940: 366 of 366 days1941: 365 of 365 days1942: 365 of 365 days1943: 365 of 365 days1944: 366 of 366 days1945: 365 of 365 days1946: 364 of 365 days1947: 365 of 365 days1948: 366 of 366 days1949: 364 of 365 days1950: 358 of 365 days1951: 363 of 365 days1952: 366 of 366 days1953: 364 of 365 days1954: 364 of 365 days1955: 360 of 365 days1956: 366 of 366 days1957: 365 of 365 days1958: 364 of 365 days1959: 363 of 365 days1960: 365 of 366 days1961: 365 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 365 of 366 days1965: 364 of 365 days1966: 364 of 365 days1967: 363 of 365 days1968: 365 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 365 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 364 of 365 days1976: 365 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 364 of 366 days1981: 364 of 365 days1982: 362 of 365 days1983: 362 of 365 days1984: 363 of 366 days1985: 363 of 365 days1986: 362 of 365 days1987: 344 of 365 days1988: 260 of 366 days1990: 151 of 365 days1991: 365 of 365 days1992: 356 of 366 days1993: 358 of 365 days1994: 360 of 365 days1995: 359 of 365 days1996: 361 of 366 days1997: 358 of 365 days1998: 352 of 365 days1999: 358 of 365 days2000: 349 of 366 days2001: 345 of 365 days2002: 326 of 365 days2003: 302 of 365 days2004: 267 of 366 days2005: 186 of 365 days2006: 306 of 365 days2007: 349 of 365 days2008: 241 of 366 days2009: 327 of 365 days2010: 321 of 365 days2011: 252 of 365 days2012: 112 of 366 days2013: 67 of 365 days2019: 17 of 365 days2020: 101 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 360 of 365 days2024: 366 of 366 days2025: 332 of 365 days2026: 243 of 365 days1900192019401960198020002020
123 years of record at Harrisburg, 1898 to 2026. 19 years have data for under 90 percent of days and are left out of rankings: 1898, 1916, 1919, 1988, 1990, 2002, 2003, 2004 and others.
Days with data per year at Harrisburg
YearDays with dataShare of yearComplete
189830483%No
189936299%Yes
190036399%Yes
1901365100%Yes
1902365100%Yes
1903365100%Yes
1904365100%Yes
1905365100%Yes
1906365100%Yes
190736199%Yes
1908365100%Yes
1909364100%Yes
1910365100%Yes
1911365100%Yes
191236199%Yes
1913364100%Yes
191436399%Yes
1915364100%Yes
191630884%No
191733592%Yes
191835998%Yes
191925169%No
192033592%Yes
192136099%Yes
192235397%Yes
192336299%Yes
192436499%Yes
192535597%Yes
192636299%Yes
192736099%Yes
192836299%Yes
192935998%Yes
193034595%Yes
193134996%Yes
193235998%Yes
1933364100%Yes
1934365100%Yes
1935365100%Yes
193633592%Yes
1937365100%Yes
1938364100%Yes
1939365100%Yes
1940366100%Yes
1941365100%Yes
1942365100%Yes
1943365100%Yes
1944366100%Yes
1945365100%Yes
1946364100%Yes
1947365100%Yes
1948366100%Yes
1949364100%Yes
195035898%Yes
195136399%Yes
1952366100%Yes
1953364100%Yes
1954364100%Yes
195536099%Yes
1956366100%Yes
1957365100%Yes
1958364100%Yes
195936399%Yes
1960365100%Yes
1961365100%Yes
1962365100%Yes
1963365100%Yes
1964365100%Yes
1965364100%Yes
1966364100%Yes
196736399%Yes
1968365100%Yes
1969365100%Yes
1970365100%Yes
1971365100%Yes
1972365100%Yes
1973365100%Yes
1974365100%Yes
1975364100%Yes
1976365100%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
198036499%Yes
1981364100%Yes
198236299%Yes
198336299%Yes
198436399%Yes
198536399%Yes
198636299%Yes
198734494%Yes
198826071%No
199015141%No
1991365100%Yes
199235697%Yes
199335898%Yes
199436099%Yes
199535998%Yes
199636199%Yes
199735898%Yes
199835296%Yes
199935898%Yes
200034995%Yes
200134595%Yes
200232689%No
200330283%No
200426773%No
200518651%No
200630684%No
200734996%Yes
200824166%No
200932790%No
201032188%No
201125269%No
201211231%No
20136718%No
2019175%No
202010128%No
2021365100%Yes
2022365100%Yes
202336099%Yes
2024366100%Yes
202533291%Yes
202624367%No

Latest Records

20
Latest records at Harrisburg
DateStationRecordValueBeat old record byOld record stoodSignificance
10 September 2026Harrisburg, USdaily rain (Provisional)36.8 mm (1.4 in)9.4 mm (0.37 in)33 years26 of 100 (Routine)
12 August 2026Harrisburg, USdaily high min25.6 C (78.1 F)0.6 C (1.1 F)85 years36 of 100 (Notable)
12 June 2026Harrisburg, USdaily rain (Tie)35.6 mm (1.4 in)tie96 years9 of 100 (Routine)
14 April 2026Harrisburg, USdaily high min19.4 C (66.9 F)1.1 C (2.0 F)113 years41 of 100 (Notable)
4 April 2026Harrisburg, USdaily high min19.4 C (66.9 F)2.7 C (4.9 F)116 years44 of 100 (Notable)
1 April 2026Harrisburg, USdaily high min18.9 C (66.0 F)2.8 C (5.0 F)85 years40 of 100 (Notable)
11 March 2026Harrisburg, USdaily high min18.3 C (64.9 F)1.6 C (2.9 F)59 years29 of 100 (Routine)
5 March 2026Harrisburg, USdaily rain45.7 mm (1.8 in)2.8 mm (0.11 in)87 years37 of 100 (Notable)
20 February 2026Harrisburg, USdaily high max22.8 C (73.0 F)0.6 C (1.1 F)43 years22 of 100 (Routine)
27 January 2026Harrisburg, USdaily low max-11.1 C (12.0 F)1.7 C (3.1 F)90 years39 of 100 (Notable)
26 January 2026Harrisburg, USdaily low max-11.1 C (12.0 F)1.1 C (2.0 F)122 years41 of 100 (Notable)
25 January 2026Harrisburg, USdaily low max-11.7 C (10.9 F)2.3 C (4.1 F)120 years43 of 100 (Notable)
9 January 2026Harrisburg, USdaily high min8.9 C (48.0 F)1.1 C (2.0 F)91 years38 of 100 (Notable)
29 December 2025Harrisburg, USdaily high max (Tie)21.1 C (70.0 F)tie40 years5 of 100 (Routine)
28 December 2025Harrisburg, USdaily high min8.9 C (48.0 F)0.6 C (1.1 F)4 years11 of 100 (Routine)
26 December 2025Harrisburg, USdaily high min15.0 C (59.0 F)1.1 C (2.0 F)54 years27 of 100 (Routine)
25 December 2025Harrisburg, USdaily high min11.7 C (53.1 F)1.1 C (2.0 F)4 years12 of 100 (Routine)
4 December 2025Harrisburg, USdaily low max (Tie)-1.1 C (30.0 F)tie0 years2 of 100 (Routine)
3 December 2025Harrisburg, USdaily low max (Tie)-3.9 C (25.0 F)tie83 years8 of 100 (Routine)
8 September 2025Harrisburg, USdaily low min (Tie)5.0 C (41.0 F)tie72 years7 of 100 (Routine)

Climate Trend

97 complete years, 1899 to 2024
Annual mean temperature at Harrisburg as warming stripes, 1899 to 2024 One stripe for each of 97 complete years at Harrisburg, 1899 to 2024. Blue stripes are years cooler than the station's own mean of 14.2 C (57.5 F); red stripes are warmer. The coolest year was 1997, at 11.8 C (53.3 F), and the warmest was 1921, at 16.2 C (61.2 F). The strongest colour marks a difference of 2.4 C (4.3 F). 1899: 13.4 C, -0.8 C from the station mean1900: 14.9 C, +0.7 C from the station mean1901: 13.8 C, -0.4 C from the station mean1902: 13.6 C, -0.6 C from the station mean1903: 13.6 C, -0.6 C from the station mean1904: 13.3 C, -0.9 C from the station mean1905: 14.0 C, -0.2 C from the station mean1906: 14.3 C, +0.1 C from the station mean1907: 14.3 C, +0.1 C from the station mean1908: 15.1 C, +0.9 C from the station mean1909: 14.8 C, +0.6 C from the station mean1910: 14.1 C, -0.1 C from the station mean1911: 15.4 C, +1.2 C from the station mean1912: 13.7 C, -0.5 C from the station mean1913: 15.6 C, +1.4 C from the station mean1914: 14.7 C, +0.5 C from the station mean1915: 14.3 C, +0.1 C from the station mean1917: 12.8 C, -1.4 C from the station mean1918: 14.3 C, +0.1 C from the station mean1921: 16.2 C, +2.0 C from the station mean1923: 14.6 C, +0.5 C from the station mean1924: 13.3 C, -0.8 C from the station mean1925: 15.1 C, +0.9 C from the station mean1926: 14.2 C, 0.0 C from the station mean1927: 15.1 C, +0.9 C from the station mean1928: 14.5 C, +0.3 C from the station mean1929: 14.1 C, -0.1 C from the station mean1933: 15.6 C, +1.4 C from the station mean1934: 15.1 C, +0.9 C from the station mean1935: 14.4 C, +0.3 C from the station mean1937: 13.8 C, -0.3 C from the station mean1938: 15.5 C, +1.3 C from the station mean1939: 15.1 C, +0.9 C from the station mean1940: 13.4 C, -0.7 C from the station mean1941: 15.1 C, +0.9 C from the station mean1942: 14.1 C, -0.1 C from the station mean1943: 14.1 C, 0.0 C from the station mean1944: 14.4 C, +0.2 C from the station mean1945: 13.4 C, -0.7 C from the station mean1946: 15.4 C, +1.2 C from the station mean1947: 13.9 C, -0.2 C from the station mean1948: 13.7 C, -0.4 C from the station mean1949: 14.8 C, +0.6 C from the station mean1950: 13.5 C, -0.7 C from the station mean1951: 13.5 C, -0.7 C from the station mean1952: 14.8 C, +0.6 C from the station mean1953: 15.3 C, +1.1 C from the station mean1954: 15.4 C, +1.2 C from the station mean1955: 14.6 C, +0.5 C from the station mean1956: 14.9 C, +0.7 C from the station mean1957: 14.3 C, +0.1 C from the station mean1958: 12.9 C, -1.3 C from the station mean1959: 14.5 C, +0.3 C from the station mean1960: 13.4 C, -0.8 C from the station mean1961: 13.9 C, -0.3 C from the station mean1962: 14.2 C, 0.0 C from the station mean1963: 13.8 C, -0.4 C from the station mean1964: 14.7 C, +0.6 C from the station mean1965: 14.8 C, +0.6 C from the station mean1966: 13.6 C, -0.6 C from the station mean1967: 14.0 C, -0.2 C from the station mean1968: 13.8 C, -0.4 C from the station mean1969: 13.6 C, -0.6 C from the station mean1970: 14.1 C, -0.1 C from the station mean1971: 14.4 C, +0.3 C from the station mean1972: 13.9 C, -0.2 C from the station mean1973: 15.0 C, +0.8 C from the station mean1974: 14.6 C, +0.4 C from the station mean1975: 14.6 C, +0.4 C from the station mean1976: 13.6 C, -0.6 C from the station mean1977: 14.3 C, +0.1 C from the station mean1978: 13.1 C, -1.1 C from the station mean1979: 12.9 C, -1.2 C from the station mean1980: 14.2 C, 0.0 C from the station mean1981: 13.9 C, -0.3 C from the station mean1982: 13.5 C, -0.7 C from the station mean1983: 13.3 C, -0.9 C from the station mean1984: 13.5 C, -0.7 C from the station mean1985: 13.4 C, -0.8 C from the station mean1986: 14.7 C, +0.5 C from the station mean1987: 14.8 C, +0.6 C from the station mean1991: 14.6 C, +0.4 C from the station mean1993: 12.8 C, -1.4 C from the station mean1994: 13.1 C, -1.0 C from the station mean1995: 13.2 C, -1.0 C from the station mean1996: 12.5 C, -1.7 C from the station mean1997: 11.8 C, -2.4 C from the station mean1998: 14.7 C, +0.6 C from the station mean1999: 14.3 C, +0.2 C from the station mean2000: 13.7 C, -0.5 C from the station mean2001: 14.4 C, +0.2 C from the station mean2002: 14.3 C, +0.1 C from the station mean2007: 14.7 C, +0.5 C from the station mean2021: 14.1 C, -0.1 C from the station mean2022: 13.7 C, -0.5 C from the station mean2023: 14.8 C, +0.7 C from the station mean2024: 15.0 C, +0.8 C from the station mean1899191019201930194019501960197019801990200020102020
One stripe for each of 97 complete years at Harrisburg, 1899 to 2024. Blue stripes are years cooler than the station's own mean of 14.2 C (57.5 F); red stripes are warmer. The coolest year was 1997, at 11.8 C (53.3 F), and the warmest was 1921, at 16.2 C (61.2 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Harrisburg as warming stripes, 1899 to 2024
YearAnnual mean temperatureDifference from the station mean
189913.4 C-0.79 C
190014.9 C+0.67 C
190113.8 C-0.43 C
190213.6 C-0.58 C
190313.6 C-0.56 C
190413.3 C-0.93 C
190514.0 C-0.23 C
190614.3 C+0.11 C
190714.3 C+0.12 C
190815.1 C+0.94 C
190914.8 C+0.57 C
191014.1 C-0.06 C
191115.4 C+1.19 C
191213.7 C-0.52 C
191315.6 C+1.37 C
191414.7 C+0.54 C
191514.3 C+0.14 C
191712.8 C-1.37 C
191814.3 C+0.08 C
192116.2 C+2.02 C
192314.6 C+0.46 C
192413.3 C-0.84 C
192515.1 C+0.93 C
192614.2 C+0.04 C
192715.1 C+0.89 C
192814.5 C+0.32 C
192914.1 C-0.06 C
193315.6 C+1.43 C
193415.1 C+0.90 C
193514.4 C+0.26 C
193713.8 C-0.35 C
193815.5 C+1.31 C
193915.1 C+0.89 C
194013.4 C-0.74 C
194115.1 C+0.94 C
194214.1 C-0.09 C
194314.1 C-0.04 C
194414.4 C+0.24 C
194513.4 C-0.74 C
194615.4 C+1.23 C
194713.9 C-0.24 C
194813.7 C-0.45 C
194914.8 C+0.61 C
195013.5 C-0.71 C
195113.5 C-0.72 C
195214.8 C+0.63 C
195315.3 C+1.08 C
195415.4 C+1.17 C
195514.6 C+0.46 C
195614.9 C+0.67 C
195714.3 C+0.08 C
195812.9 C-1.26 C
195914.5 C+0.27 C
196013.4 C-0.79 C
196113.9 C-0.31 C
196214.2 C-0.02 C
196313.8 C-0.42 C
196414.7 C+0.56 C
196514.8 C+0.63 C
196613.6 C-0.62 C
196714.0 C-0.22 C
196813.8 C-0.36 C
196913.6 C-0.59 C
197014.1 C-0.08 C
197114.4 C+0.26 C
197213.9 C-0.25 C
197315.0 C+0.83 C
197414.6 C+0.39 C
197514.6 C+0.43 C
197613.6 C-0.62 C
197714.3 C+0.09 C
197813.1 C-1.13 C
197912.9 C-1.24 C
198014.2 C+0.00 C
198113.9 C-0.31 C
198213.5 C-0.67 C
198313.3 C-0.89 C
198413.5 C-0.68 C
198513.4 C-0.82 C
198614.7 C+0.53 C
198714.8 C+0.57 C
199114.6 C+0.44 C
199312.8 C-1.41 C
199413.1 C-1.04 C
199513.2 C-0.96 C
199612.5 C-1.69 C
199711.8 C-2.36 C
199814.7 C+0.55 C
199914.3 C+0.15 C
200013.7 C-0.53 C
200114.4 C+0.17 C
200214.3 C+0.12 C
200714.7 C+0.47 C
202114.1 C-0.09 C
202213.7 C-0.47 C
202314.8 C+0.65 C
202415.0 C+0.82 C

The annual mean temperature here has fallen by 0.05 C (0.00 to 0.10) per decade over 1899 to 2024. In Fahrenheit: 0.09 F (0.00 to 0.17) per decade. The slope is a straight line fitted to 97 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Harrisburg
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.05 C (-0.09 to 0.00) per decade-0.09 F (-0.17 to 0.00) per decade1899 to 202497Fall
Mean daily maximum-0.06 C (-0.12 to -0.01) per decade-0.12 F (-0.22 to -0.02) per decade1899 to 202497Fall
Mean daily minimum-0.03 C (-0.08 to 0.02) per decade-0.06 F (-0.14 to 0.03) per decade1899 to 202497Not clearly different from zero

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1898 to 2026
Yearly extremes at Harrisburg: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.0 C (113.0 F)193637.8 C (100.0 F)123
Coldest night (TNn)-30.6 C (-23.1 F)1951-18.3 C (-0.9 F)123
Wettest day (Rx1day)254.0 mm (10.0 in)200871.1 mm (2.8 in)123
Wettest five days (Rx5day)323.8 mm (12.7 in)1910110.7 mm (4.4 in)121
Longest dry spell (CDD)49 days196421 days123

Hottest day (TXx)

Hottest day (TXx) at Harrisburg by year The hottest day of the year at Harrisburg, 1898 to 2026. The record is 45.0 C (113.0 F) in 1936, marked on the chart; the median year is 37.8 C (100.0 F). 25303540451900192019401960198020002020Record: 45.0 C (113.0 F) in 1936
The hottest day of the year at Harrisburg, 1898 to 2026. The record is 45.0 C (113.0 F) in 1936, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Harrisburg by year
YearHottest day (TXx)
189836.7 C (98.1 F)
189938.9 C (102.0 F)
190042.2 C (108.0 F)
190144.4 C (111.9 F)
190240.0 C (104.0 F)
190337.8 C (100.0 F)
190437.2 C (99.0 F)
190537.2 C (99.0 F)
190636.7 C (98.1 F)
190739.4 C (102.9 F)
190837.2 C (99.0 F)
190940.6 C (105.1 F)
191036.7 C (98.1 F)
191140.0 C (104.0 F)
191238.3 C (100.9 F)
191342.8 C (109.0 F)
191440.6 C (105.1 F)
191538.3 C (100.9 F)
191637.2 C (99.0 F)
191737.2 C (99.0 F)
191843.3 C (109.9 F)
191938.9 C (102.0 F)
192037.2 C (99.0 F)
192139.4 C (102.9 F)
192238.3 C (100.9 F)
192338.3 C (100.9 F)
192437.8 C (100.0 F)
192542.8 C (109.0 F)
192640.6 C (105.1 F)
192738.3 C (100.9 F)
192836.7 C (98.1 F)
192937.2 C (99.0 F)
193044.4 C (111.9 F)
193141.1 C (106.0 F)
193239.4 C (102.9 F)
193339.4 C (102.9 F)
193442.2 C (108.0 F)
193539.4 C (102.9 F)
193645.0 C (113.0 F)
193737.2 C (99.0 F)
193838.3 C (100.9 F)
193940.0 C (104.0 F)
194039.4 C (102.9 F)
194138.9 C (102.0 F)
194237.8 C (100.0 F)
194339.4 C (102.9 F)
194438.3 C (100.9 F)
194537.2 C (99.0 F)
194636.7 C (98.1 F)
194740.0 C (104.0 F)
194837.8 C (100.0 F)
194940.0 C (104.0 F)
195036.1 C (97.0 F)
195139.4 C (102.9 F)
195242.8 C (109.0 F)
195340.0 C (104.0 F)
195441.1 C (106.0 F)
195542.8 C (109.0 F)
195639.4 C (102.9 F)
195736.7 C (98.1 F)
195836.1 C (97.0 F)
195936.7 C (98.1 F)
196037.8 C (100.0 F)
196138.9 C (102.0 F)
196240.6 C (105.1 F)
196338.9 C (102.0 F)
196441.7 C (107.1 F)
196538.9 C (102.0 F)
196641.1 C (106.0 F)
196736.7 C (98.1 F)
196838.3 C (100.9 F)
196937.8 C (100.0 F)
197038.3 C (100.9 F)
197138.3 C (100.9 F)
197236.7 C (98.1 F)
197337.2 C (99.0 F)
197437.8 C (100.0 F)
197536.1 C (97.0 F)
197638.3 C (100.9 F)
197737.8 C (100.0 F)
197838.9 C (102.0 F)
197935.6 C (96.1 F)
198040.6 C (105.1 F)
198136.1 C (97.0 F)
198236.1 C (97.0 F)
198340.0 C (104.0 F)
198436.1 C (97.0 F)
198536.1 C (97.0 F)
198637.2 C (99.0 F)
198738.3 C (100.9 F)
198838.3 C (100.9 F)
199037.8 C (100.0 F)
199138.3 C (100.9 F)
199234.4 C (93.9 F)
199335.6 C (96.1 F)
199435.6 C (96.1 F)
199536.7 C (98.1 F)
199635.0 C (95.0 F)
199737.2 C (99.0 F)
199836.1 C (97.0 F)
199938.9 C (102.0 F)
200037.8 C (100.0 F)
200136.1 C (97.0 F)
200237.8 C (100.0 F)
200335.6 C (96.1 F)
200435.0 C (95.0 F)
200536.7 C (98.1 F)
200637.2 C (99.0 F)
200739.4 C (102.9 F)
200836.1 C (97.0 F)
200936.1 C (97.0 F)
201039.4 C (102.9 F)
201137.2 C (99.0 F)
201241.1 C (106.0 F)
201333.9 C (93.0 F)
201932.2 C (90.0 F)
202027.8 C (82.0 F)
202136.1 C (97.0 F)
202237.2 C (99.0 F)
202337.8 C (100.0 F)
202437.8 C (100.0 F)
202536.1 C (97.0 F)
202636.7 C (98.1 F)

Coldest night (TNn)

Coldest night (TNn) at Harrisburg by year The coldest night of the year at Harrisburg, 1898 to 2026. The record is -30.6 C (-23.1 F) in 1951, marked on the chart; the median year is -18.3 C (-0.9 F). -40-30-20-100101900192019401960198020002020Record: -30.6 C (-23.1 F) in 1951
The coldest night of the year at Harrisburg, 1898 to 2026. The record is -30.6 C (-23.1 F) in 1951, marked on the chart; the median year is -18.3 C (-0.9 F).
Coldest night (TNn) at Harrisburg by year
YearColdest night (TNn)
1898-16.1 C (3.0 F)
1899-30.0 C (-22.0 F)
1900-23.3 C (-9.9 F)
1901-22.8 C (-9.0 F)
1902-16.7 C (1.9 F)
1903-20.0 C (-4.0 F)
1904-25.0 C (-13.0 F)
1905-23.3 C (-9.9 F)
1906-22.2 C (-8.0 F)
1907-15.0 C (5.0 F)
1908-12.8 C (9.0 F)
1909-19.4 C (-2.9 F)
1910-22.2 C (-8.0 F)
1911-17.8 C (0.0 F)
1912-28.9 C (-20.0 F)
1913-15.0 C (5.0 F)
1914-21.7 C (-7.1 F)
1915-15.0 C (5.0 F)
1916-20.6 C (-5.1 F)
1917-23.9 C (-11.0 F)
1918-27.8 C (-18.0 F)
1919-17.8 C (0.0 F)
1920-15.0 C (5.0 F)
1921-8.3 C (17.1 F)
1922-11.7 C (10.9 F)
1923-13.9 C (7.0 F)
1924-23.3 C (-9.9 F)
1925-18.3 C (-0.9 F)
1926-20.6 C (-5.1 F)
1927-18.9 C (-2.0 F)
1928-19.4 C (-2.9 F)
1929-21.1 C (-6.0 F)
1930-26.7 C (-16.1 F)
1931-13.9 C (7.0 F)
1932-16.7 C (1.9 F)
1933-18.3 C (-0.9 F)
1934-25.6 C (-14.1 F)
1935-18.3 C (-0.9 F)
1936-23.3 C (-9.9 F)
1937-13.9 C (7.0 F)
1938-15.0 C (5.0 F)
1939-18.3 C (-0.9 F)
1940-23.3 C (-9.9 F)
1941-11.7 C (10.9 F)
1942-23.9 C (-11.0 F)
1943-18.9 C (-2.0 F)
1944-15.6 C (3.9 F)
1945-16.1 C (3.0 F)
1946-13.3 C (8.1 F)
1947-14.4 C (6.1 F)
1948-20.6 C (-5.1 F)
1949-14.4 C (6.1 F)
1950-18.9 C (-2.0 F)
1951-30.6 C (-23.1 F)
1952-13.3 C (8.1 F)
1953-16.1 C (3.0 F)
1954-21.7 C (-7.1 F)
1955-17.2 C (1.0 F)
1956-15.0 C (5.0 F)
1957-15.6 C (3.9 F)
1958-19.4 C (-2.9 F)
1959-20.0 C (-4.0 F)
1960-22.2 C (-8.0 F)
1961-24.4 C (-11.9 F)
1962-21.7 C (-7.1 F)
1963-27.2 C (-17.0 F)
1964-22.8 C (-9.0 F)
1965-21.7 C (-7.1 F)
1966-21.1 C (-6.0 F)
1967-19.4 C (-2.9 F)
1968-19.4 C (-2.9 F)
1969-14.4 C (6.1 F)
1970-20.6 C (-5.1 F)
1971-16.7 C (1.9 F)
1972-20.6 C (-5.1 F)
1973-19.4 C (-2.9 F)
1974-16.1 C (3.0 F)
1975-12.8 C (9.0 F)
1976-21.1 C (-6.0 F)
1977-30.0 C (-22.0 F)
1978-21.7 C (-7.1 F)
1979-23.3 C (-9.9 F)
1980-21.1 C (-6.0 F)
1981-17.8 C (0.0 F)
1982-27.8 C (-18.0 F)
1983-23.3 C (-9.9 F)
1984-27.2 C (-17.0 F)
1985-22.2 C (-8.0 F)
1986-18.3 C (-0.9 F)
1987-14.4 C (6.1 F)
1988-15.6 C (3.9 F)
1990-16.7 C (1.9 F)
1991-13.3 C (8.1 F)
1992-14.4 C (6.1 F)
1993-19.4 C (-2.9 F)
1994-28.3 C (-18.9 F)
1995-16.1 C (3.0 F)
1996-22.2 C (-8.0 F)
1997-18.3 C (-0.9 F)
1998-11.7 C (10.9 F)
1999-16.7 C (1.9 F)
2000-16.1 C (3.0 F)
2001-17.8 C (0.0 F)
2002-16.1 C (3.0 F)
2003-21.7 C (-7.1 F)
2004-17.8 C (0.0 F)
2005-7.2 C (19.0 F)
2006-13.9 C (7.0 F)
2007-13.9 C (7.0 F)
2008-14.4 C (6.1 F)
2009-18.3 C (-0.9 F)
2010-20.6 C (-5.1 F)
2011-15.6 C (3.9 F)
2012-8.3 C (17.1 F)
2013-11.7 C (10.9 F)
20199.4 C (48.9 F)
2020-12.2 C (10.0 F)
2021-19.4 C (-2.9 F)
2022-17.8 C (0.0 F)
2023-8.3 C (17.1 F)
2024-17.2 C (1.0 F)
2025-17.2 C (1.0 F)
2026-17.8 C (0.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Harrisburg by year The wettest day of the year at Harrisburg, 1898 to 2026. The record is 254.0 mm (10.0 in) in 2008, marked on the chart; the median year is 71.1 mm (2.8 in). 01002003001900192019401960198020002020Record: 254.0 mm (10.0 in) in 2008
The wettest day of the year at Harrisburg, 1898 to 2026. The record is 254.0 mm (10.0 in) in 2008, marked on the chart; the median year is 71.1 mm (2.8 in).
Wettest day (Rx1day) at Harrisburg by year
YearWettest day (Rx1day)
189866.0 mm (2.6 in)
189984.6 mm (3.3 in)
190078.2 mm (3.1 in)
190188.9 mm (3.5 in)
190245.5 mm (1.8 in)
190375.2 mm (3.0 in)
190499.3 mm (3.9 in)
1905109.2 mm (4.3 in)
190666.0 mm (2.6 in)
190755.9 mm (2.2 in)
190866.5 mm (2.6 in)
190961.0 mm (2.4 in)
1910138.9 mm (5.5 in)
191176.2 mm (3.0 in)
191274.7 mm (2.9 in)
191376.7 mm (3.0 in)
1914109.0 mm (4.3 in)
191583.8 mm (3.3 in)
191657.2 mm (2.3 in)
191775.7 mm (3.0 in)
1918101.6 mm (4.0 in)
191949.3 mm (1.9 in)
192075.7 mm (3.0 in)
1921114.3 mm (4.5 in)
192283.3 mm (3.3 in)
192373.2 mm (2.9 in)
192450.3 mm (2.0 in)
192567.6 mm (2.7 in)
192648.0 mm (1.9 in)
192777.0 mm (3.0 in)
192886.4 mm (3.4 in)
192961.5 mm (2.4 in)
193046.7 mm (1.8 in)
193171.1 mm (2.8 in)
1932108.2 mm (4.3 in)
193361.5 mm (2.4 in)
193459.7 mm (2.4 in)
1935111.5 mm (4.4 in)
193643.9 mm (1.7 in)
193797.5 mm (3.8 in)
193848.3 mm (1.9 in)
193960.2 mm (2.4 in)
194052.1 mm (2.1 in)
194197.3 mm (3.8 in)
194256.1 mm (2.2 in)
1943111.8 mm (4.4 in)
194466.5 mm (2.6 in)
194577.7 mm (3.1 in)
194677.7 mm (3.1 in)
194759.7 mm (2.4 in)
1948111.3 mm (4.4 in)
194958.4 mm (2.3 in)
195073.7 mm (2.9 in)
195157.7 mm (2.3 in)
195269.9 mm (2.8 in)
195341.7 mm (1.6 in)
195474.9 mm (2.9 in)
195563.0 mm (2.5 in)
195650.8 mm (2.0 in)
1957187.5 mm (7.4 in)
195840.1 mm (1.6 in)
1959171.5 mm (6.8 in)
196051.3 mm (2.0 in)
196192.7 mm (3.6 in)
196260.5 mm (2.4 in)
196351.8 mm (2.0 in)
1964140.5 mm (5.5 in)
196552.3 mm (2.1 in)
196671.1 mm (2.8 in)
196760.2 mm (2.4 in)
196885.1 mm (3.4 in)
1969158.8 mm (6.3 in)
197071.6 mm (2.8 in)
197149.5 mm (1.9 in)
197267.8 mm (2.7 in)
197386.4 mm (3.4 in)
197487.9 mm (3.5 in)
197566.3 mm (2.6 in)
197680.0 mm (3.1 in)
197796.5 mm (3.8 in)
197883.8 mm (3.3 in)
197971.1 mm (2.8 in)
198050.3 mm (2.0 in)
198166.0 mm (2.6 in)
1982135.1 mm (5.3 in)
198381.3 mm (3.2 in)
198481.0 mm (3.2 in)
198587.1 mm (3.4 in)
198648.3 mm (1.9 in)
198763.5 mm (2.5 in)
198851.3 mm (2.0 in)
199064.0 mm (2.5 in)
199167.3 mm (2.6 in)
199266.5 mm (2.6 in)
199362.2 mm (2.4 in)
199481.5 mm (3.2 in)
199550.8 mm (2.0 in)
1996146.1 mm (5.8 in)
1997104.1 mm (4.1 in)
199871.4 mm (2.8 in)
199971.9 mm (2.8 in)
2000107.7 mm (4.2 in)
200193.7 mm (3.7 in)
200252.1 mm (2.1 in)
200358.4 mm (2.3 in)
200457.9 mm (2.3 in)
200569.9 mm (2.8 in)
2006108.5 mm (4.3 in)
200795.3 mm (3.8 in)
2008254.0 mm (10.0 in)
200971.1 mm (2.8 in)
201066.0 mm (2.6 in)
2011125.7 mm (4.9 in)
201238.6 mm (1.5 in)
201322.6 mm (0.9 in)
201941.1 mm (1.6 in)
202044.5 mm (1.8 in)
2021101.6 mm (4.0 in)
2022111.8 mm (4.4 in)
202363.5 mm (2.5 in)
202476.2 mm (3.0 in)
202545.7 mm (1.8 in)
202645.7 mm (1.8 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Harrisburg by year The wettest five days of the year at Harrisburg, 1898 to 2026. The record is 323.8 mm (12.7 in) in 1910, marked on the chart; the median year is 110.7 mm (4.4 in). 01002003004001900192019401960198020002020Record: 323.8 mm (12.7 in) in 1910
The wettest five days of the year at Harrisburg, 1898 to 2026. The record is 323.8 mm (12.7 in) in 1910, marked on the chart; the median year is 110.7 mm (4.4 in).
Wettest five days (Rx5day) at Harrisburg by year
YearWettest five days (Rx5day)
1898103.4 mm (4.1 in)
1899164.6 mm (6.5 in)
1900105.6 mm (4.2 in)
1901104.1 mm (4.1 in)
190268.2 mm (2.7 in)
1903141.5 mm (5.6 in)
1904103.1 mm (4.1 in)
1905123.0 mm (4.8 in)
1906179.3 mm (7.1 in)
1907137.4 mm (5.4 in)
190892.1 mm (3.6 in)
1909137.5 mm (5.4 in)
1910323.8 mm (12.7 in)
1911124.4 mm (4.9 in)
1912100.8 mm (4.0 in)
1913115.9 mm (4.6 in)
1914146.1 mm (5.8 in)
1915120.9 mm (4.8 in)
1916160.4 mm (6.3 in)
191794.5 mm (3.7 in)
1918180.1 mm (7.1 in)
191988.7 mm (3.5 in)
192093.2 mm (3.7 in)
1921198.2 mm (7.8 in)
1922105.5 mm (4.2 in)
1923108.7 mm (4.3 in)
192475.2 mm (3.0 in)
1925119.2 mm (4.7 in)
192670.3 mm (2.8 in)
1927130.7 mm (5.1 in)
1928142.8 mm (5.6 in)
192993.7 mm (3.7 in)
193079.8 mm (3.1 in)
193177.2 mm (3.0 in)
1932118.1 mm (4.6 in)
1933118.1 mm (4.6 in)
193489.4 mm (3.5 in)
1935155.7 mm (6.1 in)
193663.7 mm (2.5 in)
1937175.5 mm (6.9 in)
193881.6 mm (3.2 in)
193998.0 mm (3.9 in)
194075.5 mm (3.0 in)
194197.3 mm (3.8 in)
194288.6 mm (3.5 in)
1943131.4 mm (5.2 in)
1944119.6 mm (4.7 in)
1945121.4 mm (4.8 in)
1946182.1 mm (7.2 in)
194793.2 mm (3.7 in)
1948137.0 mm (5.4 in)
1949110.7 mm (4.4 in)
1950173.7 mm (6.8 in)
195177.2 mm (3.0 in)
1952104.4 mm (4.1 in)
195365.8 mm (2.6 in)
1954104.9 mm (4.1 in)
195588.4 mm (3.5 in)
195686.3 mm (3.4 in)
1957276.4 mm (10.9 in)
195877.7 mm (3.1 in)
1959171.5 mm (6.8 in)
196053.4 mm (2.1 in)
1961241.7 mm (9.5 in)
1962112.3 mm (4.4 in)
196386.9 mm (3.4 in)
1964188.2 mm (7.4 in)
196598.3 mm (3.9 in)
196696.5 mm (3.8 in)
196788.4 mm (3.5 in)
196895.3 mm (3.8 in)
1969162.6 mm (6.4 in)
1970124.7 mm (4.9 in)
197176.9 mm (3.0 in)
1972129.5 mm (5.1 in)
1973142.5 mm (5.6 in)
1974103.6 mm (4.1 in)
197588.7 mm (3.5 in)
1976112.6 mm (4.4 in)
1977133.3 mm (5.2 in)
1978105.4 mm (4.1 in)
1979123.9 mm (4.9 in)
198079.3 mm (3.1 in)
1981119.3 mm (4.7 in)
1982183.4 mm (7.2 in)
1983223.0 mm (8.8 in)
1984119.2 mm (4.7 in)
1985130.0 mm (5.1 in)
198682.6 mm (3.3 in)
1987105.7 mm (4.2 in)
198871.9 mm (2.8 in)
1990106.0 mm (4.2 in)
1991113.0 mm (4.4 in)
1992115.3 mm (4.5 in)
1993107.7 mm (4.2 in)
1994100.3 mm (3.9 in)
1995115.1 mm (4.5 in)
1996158.0 mm (6.2 in)
1997152.8 mm (6.0 in)
1998116.9 mm (4.6 in)
199985.1 mm (3.4 in)
2000173.9 mm (6.8 in)
2001155.8 mm (6.1 in)
200299.1 mm (3.9 in)
2003108.9 mm (4.3 in)
200481.3 mm (3.2 in)
200596.6 mm (3.8 in)
2006194.1 mm (7.6 in)
2007128.3 mm (5.1 in)
2008298.3 mm (11.7 in)
2009106.4 mm (4.2 in)
2010150.1 mm (5.9 in)
2011200.7 mm (7.9 in)
2012n/a
201345.5 mm (1.8 in)
2019n/a
202053.4 mm (2.1 in)
2021121.9 mm (4.8 in)
2022111.8 mm (4.4 in)
202378.8 mm (3.1 in)
2024135.8 mm (5.3 in)
202593.9 mm (3.7 in)
202659.7 mm (2.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Harrisburg by year The longest dry spell of the year at Harrisburg, 1898 to 2026. The record is 49 days in 1964, marked on the chart; the median year is 21 days. 02040601900192019401960198020002020Record: 49 days in 1964
The longest dry spell of the year at Harrisburg, 1898 to 2026. The record is 49 days in 1964, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Harrisburg by year
YearLongest dry spell (CDD)
189820 days
189918 days
190020 days
190118 days
190231 days
190324 days
190433 days
190514 days
190615 days
190722 days
190840 days
190923 days
191036 days
191118 days
191222 days
191321 days
191441 days
191523 days
191616 days
191728 days
191818 days
191921 days
192026 days
192119 days
192219 days
192315 days
192432 days
192527 days
192614 days
192720 days
192833 days
192915 days
193022 days
193122 days
193216 days
193340 days
193425 days
193521 days
193621 days
193719 days
193830 days
193936 days
194019 days
194119 days
194224 days
194326 days
194429 days
194517 days
194627 days
194721 days
194819 days
194925 days
195020 days
195114 days
195233 days
195322 days
195417 days
195523 days
195618 days
195722 days
195820 days
195916 days
196018 days
196122 days
196219 days
196345 days
196449 days
196520 days
196613 days
196722 days
196824 days
196923 days
197014 days
197119 days
197214 days
197315 days
197416 days
197517 days
197626 days
197718 days
197818 days
197913 days
198022 days
198132 days
198214 days
198328 days
198412 days
198518 days
198623 days
198721 days
198818 days
199013 days
199127 days
199219 days
199318 days
199419 days
199536 days
199612 days
199724 days
199820 days
199943 days
200021 days
200125 days
200222 days
200327 days
200437 days
200521 days
200621 days
200722 days
200820 days
200926 days
201025 days
20111 day
20121 day
201313 days
20194 days
202014 days
202122 days
202218 days
202318 days
202422 days
202522 days
202611 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

97 years with a frost

Across 97 years with a frost, the median last spring frost at Harrisburg falls on 12 April and the median first autumn frost on 18 October, which leaves a median of 188 days between them.

In 1974 to 2024 the median growing season was 191 days. That is 5 days more than in 1899 to 1935.

Fitted over all years, the growing season changes by +0.4 days per decade at this station.

Frost dates and growing season at Harrisburg
MeasureMedian, all yearsEarliest period (1899 to 1935)Recent period (1974 to 2024)Recent against earliestFitted trend
Last spring frost12 April14 April8 April6 days earlier-0.5 days per decade
First autumn frost18 October21 October16 October5 days earlier-0.1 days per decade
Growing days188 days186 days191 days5 days more+0.4 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

104 years, 1899 to 2021

A day with at least 72.8 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 179.2 mm (7.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Harrisburg: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years72.8 mm (2.9 in)
5 years96.5 mm (3.8 in)
10 years114.0 mm (4.5 in)
25 years138.2 mm (5.4 in)
50 years158.0 mm (6.2 in)
100 years179.2 mm (7.1 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 104 years of values from 1899 to 2021.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 187.5 mm (7.4 in) in 1957; 171.5 mm (6.8 in) in 1959; 158.8 mm (6.3 in) in 1969.

Station Changes

2 suspected

2 changes were suspected in the annual mean temperature of Harrisburg, at 1933 and 1962. Each is measured against neighbouring stations.

  • Relative to 5 neighbouring stations, the station's annual mean temperature from 1933 ran 0.2 C (0.4 F) lower than in the years before (likely change).
  • Relative to 5 neighbouring stations, the station's annual mean temperature from 1962 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Harrisburg, against neighbouring stations
YearShift (C)Shift (F)StrengthNeighbours
1933-0.2-0.4likely5
1962+0.4+0.7likely5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

  • Data for Harrisburg standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Harrisburg threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-16).