Built 2026-10-16 (16 October 2026)

Hartwell Weather Records (USC00094133)

Record envelope, standing records and threshold days for Hartwell (USC00094133), Georgia, United States, with 119 years of record.

Key Facts for Hartwell

  • Hartwell (USC00094133) is a weather station in Georgia, United States at 34.35 latitude and -82.93 longitude, 245 m (805 ft) above sea level.
  • The station reports from 1908 to 2026, 119 years of record.
  • 1,464 records set at Hartwell still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Hartwell tied a daily record high minimum temperature of 22.8 C (73.0 F) on 4 September 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Georgia, United States, 34.35 latitude, -82.93 longitude.
  • Elevation: 245 m (805 ft).
  • Period of record: 1908 to 2026, 119 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

3 days at or beyond a record
Daily record high and record low at Hartwell, with 2026 drawn through them The band shows the record high and record low for each calendar day at Hartwell. The lines show the 2026 daily maximum and minimum. 3 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 Hartwell. The lines show the 2026 daily maximum and minimum. 3 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Hartwell, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan26.7 C (80.1 F)-20.6 C (-5.1 F)21.7 C (71.1 F)-9.4 C (15.1 F)
Feb27.8 C (82.0 F)-15.6 C (3.9 F)26.1 C (79.0 F)-10.0 C (14.0 F)
Mar32.8 C (91.0 F)-12.2 C (10.0 F)30.0 C (86.0 F)-2.2 C (28.0 F)
Apr35.6 C (96.1 F)-3.9 C (25.0 F)30.6 C (87.1 F)3.9 C (39.0 F)
May38.9 C (102.0 F)1.1 C (34.0 F)31.7 C (89.1 F)5.6 C (42.1 F)
Jun41.1 C (106.0 F)7.2 C (45.0 F)33.9 C (93.0 F)13.3 C (55.9 F)
Jul42.8 C (109.0 F)10.6 C (51.1 F)35.6 C (96.1 F)20.0 C (68.0 F)
Aug42.2 C (108.0 F)11.7 C (53.1 F)36.7 C (98.1 F)18.3 C (64.9 F)
Sep42.8 C (109.0 F)3.9 C (39.0 F)37.8 C (100.0 F)8.9 C (48.0 F)
Oct37.8 C (100.0 F)-3.3 C (26.1 F)30.6 C (87.1 F)12.8 C (55.0 F)
Nov30.0 C (86.0 F)-13.9 C (7.0 F)n/an/a
Dec27.8 C (82.0 F)-16.1 C (3.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Hartwell by the year they were set 1,464 records at Hartwell still stand. 1925 holds the most, with 58. 02040601908: 101909: 91910: 371911: 101912: 81913: 161914: 211915: 91916: 61917: 321918: 271919: 91920: 91921: 101922: 151923: 131924: 171925: 581926: 201927: 231928: 161929: 201930: 221931: 121932: 91933: 211934: 61935: 131936: 191937: 241938: 121939: 121940: 231941: 151942: 51943: 171944: 161945: 91946: 61947: 151948: 141949: 81950: 201951: 101952: 271953: 111954: 341955: 111956: 151957: 141958: 81959: 61960: 121961: 31962: 101963: 131964: 131965: 91966: 91967: 181968: 81969: 51970: 211971: 101972: 51973: 61974: 201975: 51976: 131977: 141978: 51979: 141980: 131981: 41982: 21983: 131984: 161985: 201986: 171987: 31988: 51989: 111990: 31991: 81992: 91993: 141994: 151995: 111996: 151997: 151998: 81999: 102000: 92001: 52002: 122003: 62004: 42005: 62006: 32007: 82009: 52010: 112011: 92012: 42013: 92014: 122015: 142016: 32017: 112018: 92019: 82020: 132021: 62022: 82023: 62024: 32025: 172026: 91908192019321944195619681980199220042017
1,464 records at Hartwell still stand. 1925 holds the most, with 58.
Standing records at Hartwell by the year they were set
Year setStanding records
190810
19099
191037
191110
19128
191316
191421
19159
19166
191732
191827
19199
19209
192110
192215
192313
192417
192558
192620
192723
192816
192920
193022
193112
19329
193321
19346
193513
193619
193724
193812
193912
194023
194115
19425
194317
194416
19459
19466
194715
194814
19498
195020
195110
195227
195311
195434
195511
195615
195714
19588
19596
196012
19613
196210
196313
196413
19659
19669
196718
19688
19695
197021
197110
19725
19736
197420
19755
197613
197714
19785
197914
198013
19814
19822
198313
198416
198520
198617
19873
19885
198911
19903
19918
19929
199314
199415
199511
199615
199715
19988
199910
20009
20015
200212
20036
20044
20056
20063
20078
20095
201011
20119
20124
20139
201412
201514
20163
201711
20189
20198
202013
20216
20228
20236
20243
202517
20269

All-Time Record Progression

2 new records
When Hartwell set new all-time records 2 all-time records were set at Hartwell between 26 January 1940 and 16 August 1994. Each dot is a new record. Record low minimum temperatureRecord daily precipitation26 January 1940: Record low minimum temperature -20.6 C (-5.1 F)16 August 1994: Record daily precipitation 182.9 mm (7.2 in)194019501960197019801990
2 all-time records were set at Hartwell between 26 January 1940 and 16 August 1994. Each dot is a new record.
When Hartwell set new all-time records
DateKindDetail
1940-01-26Record low minimum temperatureRecord low minimum temperature -20.6 C (-5.1 F)
1994-08-16Record daily precipitationRecord daily precipitation 182.9 mm (7.2 in)

Wettest Day of Each Month

Aug: 182.9 mm (7.2 in)
Record daily precipitation for each month at Hartwell The wettest day on record for each calendar month at Hartwell. The most was 182.9 mm (7.2 in) on 16 August 1994. 050100150200 Jan: 111.5 mm (4.4 in), 18 January 1943 Jan Feb: 91.7 mm (3.6 in), 7 February 2020 Feb Mar: 127.0 mm (5.0 in), 15 March 1990 Mar Apr: 92.2 mm (3.6 in), 13 April 1979 Apr May: 82.6 mm (3.3 in), 7 May 2026 May Jun: 142.5 mm (5.6 in), 4 June 1967 Jun Jul: 152.4 mm (6.0 in), 19 July 1964 Jul Aug: 182.9 mm (7.2 in), 16 August 1994 Aug Sep: 165.1 mm (6.5 in), 8 September 2014 Sep Oct: 123.7 mm (4.9 in), 4 October 2015 Oct Nov: 130.8 mm (5.1 in), 11 November 2009 Nov Dec: 115.1 mm (4.5 in), 16 December 1992 Dec
The wettest day on record for each calendar month at Hartwell. The most was 182.9 mm (7.2 in) on 16 August 1994.
Record daily precipitation for each month at Hartwell
MonthRecord daily precipitation (mm)Date
Jan111.5 mm (4.4 in)18 January 1943
Feb91.7 mm (3.6 in)7 February 2020
Mar127.0 mm (5.0 in)15 March 1990
Apr92.2 mm (3.6 in)13 April 1979
May82.6 mm (3.3 in)7 May 2026
Jun142.5 mm (5.6 in)4 June 1967
Jul152.4 mm (6.0 in)19 July 1964
Aug182.9 mm (7.2 in)16 August 1994
Sep165.1 mm (6.5 in)8 September 2014
Oct123.7 mm (4.9 in)4 October 2015
Nov130.8 mm (5.1 in)11 November 2009
Dec115.1 mm (4.5 in)16 December 1992

Period of Record Coverage

1908 to 2026
Days with data per year at Hartwell 119 years of record at Hartwell, 1908 to 2026. 17 years have data for under 90 percent of days and are left out of rankings: 1908, 1910, 1911, 1912, 1913, 1916, 1918, 1919 and others. 1908: 235 of 366 days1909: 365 of 365 days1910: 298 of 365 days1911: 170 of 365 days1912: 181 of 366 days1913: 265 of 365 days1914: 348 of 365 days1915: 361 of 365 days1916: 302 of 366 days1917: 362 of 365 days1918: 302 of 365 days1919: 272 of 365 days1920: 364 of 366 days1921: 361 of 365 days1922: 364 of 365 days1923: 361 of 365 days1924: 303 of 366 days1925: 361 of 365 days1926: 360 of 365 days1927: 364 of 365 days1928: 354 of 366 days1929: 363 of 365 days1930: 359 of 365 days1931: 351 of 365 days1932: 364 of 366 days1933: 361 of 365 days1934: 363 of 365 days1935: 362 of 365 days1936: 361 of 366 days1937: 365 of 365 days1938: 363 of 365 days1939: 364 of 365 days1940: 365 of 366 days1941: 365 of 365 days1942: 363 of 365 days1943: 364 of 365 days1944: 365 of 366 days1945: 364 of 365 days1946: 357 of 365 days1947: 354 of 365 days1948: 349 of 366 days1949: 324 of 365 days1950: 349 of 365 days1951: 360 of 365 days1952: 366 of 366 days1953: 365 of 365 days1954: 363 of 365 days1955: 364 of 365 days1956: 365 of 366 days1957: 365 of 365 days1958: 365 of 365 days1959: 364 of 365 days1960: 364 of 366 days1961: 82 of 365 days1962: 305 of 365 days1963: 360 of 365 days1964: 350 of 366 days1965: 364 of 365 days1966: 364 of 365 days1967: 357 of 365 days1968: 354 of 366 days1969: 360 of 365 days1970: 363 of 365 days1971: 362 of 365 days1972: 365 of 366 days1973: 358 of 365 days1974: 355 of 365 days1975: 358 of 365 days1976: 362 of 366 days1977: 364 of 365 days1978: 353 of 365 days1979: 340 of 365 days1980: 297 of 366 days1981: 356 of 365 days1982: 355 of 365 days1983: 357 of 365 days1984: 365 of 366 days1985: 362 of 365 days1986: 362 of 365 days1987: 332 of 365 days1988: 257 of 366 days1989: 304 of 365 days1990: 340 of 365 days1991: 258 of 365 days1992: 350 of 366 days1993: 354 of 365 days1994: 360 of 365 days1995: 335 of 365 days1996: 361 of 366 days1997: 349 of 365 days1998: 355 of 365 days1999: 346 of 365 days2000: 356 of 366 days2001: 361 of 365 days2002: 357 of 365 days2003: 364 of 365 days2004: 364 of 366 days2005: 348 of 365 days2006: 354 of 365 days2007: 351 of 365 days2008: 351 of 366 days2009: 358 of 365 days2010: 347 of 365 days2011: 333 of 365 days2012: 334 of 366 days2013: 355 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 365 of 365 days2022: 362 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 269 of 365 days19201935195019651980199520102025
119 years of record at Hartwell, 1908 to 2026. 17 years have data for under 90 percent of days and are left out of rankings: 1908, 1910, 1911, 1912, 1913, 1916, 1918, 1919 and others.
Days with data per year at Hartwell
YearDays with dataShare of yearComplete
190823564%No
1909365100%Yes
191029882%No
191117047%No
191218149%No
191326573%No
191434895%Yes
191536199%Yes
191630283%No
191736299%Yes
191830283%No
191927275%No
192036499%Yes
192136199%Yes
1922364100%Yes
192336199%Yes
192430383%No
192536199%Yes
192636099%Yes
1927364100%Yes
192835497%Yes
192936399%Yes
193035998%Yes
193135196%Yes
193236499%Yes
193336199%Yes
193436399%Yes
193536299%Yes
193636199%Yes
1937365100%Yes
193836399%Yes
1939364100%Yes
1940365100%Yes
1941365100%Yes
194236399%Yes
1943364100%Yes
1944365100%Yes
1945364100%Yes
194635798%Yes
194735497%Yes
194834995%Yes
194932489%No
195034996%Yes
195136099%Yes
1952366100%Yes
1953365100%Yes
195436399%Yes
1955364100%Yes
1956365100%Yes
1957365100%Yes
1958365100%Yes
1959364100%Yes
196036499%Yes
19618222%No
196230584%No
196336099%Yes
196435096%Yes
1965364100%Yes
1966364100%Yes
196735798%Yes
196835497%Yes
196936099%Yes
197036399%Yes
197136299%Yes
1972365100%Yes
197335898%Yes
197435597%Yes
197535898%Yes
197636299%Yes
1977364100%Yes
197835397%Yes
197934093%Yes
198029781%No
198135698%Yes
198235597%Yes
198335798%Yes
1984365100%Yes
198536299%Yes
198636299%Yes
198733291%Yes
198825770%No
198930483%No
199034093%Yes
199125871%No
199235096%Yes
199335497%Yes
199436099%Yes
199533592%Yes
199636199%Yes
199734996%Yes
199835597%Yes
199934695%Yes
200035697%Yes
200136199%Yes
200235798%Yes
2003364100%Yes
200436499%Yes
200534895%Yes
200635497%Yes
200735196%Yes
200835196%Yes
200935898%Yes
201034795%Yes
201133391%Yes
201233491%Yes
201335597%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
202236299%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202626974%No

Latest Records

20
Latest records at Hartwell
DateStationRecordValueBeat old record byOld record stoodSignificance
4 September 2026Hartwell, USdaily high min (Tie, Provisional)22.8 C (73.0 F)tie5 years2 of 100 (Routine)
25 July 2026Hartwell, USdaily low max23.3 C (73.9 F)2.8 C (5.0 F)107 years48 of 100 (Notable)
2 July 2026Hartwell, USdaily high min (Tie)23.9 C (75.0 F)tie29 years4 of 100 (Routine)
12 June 2026Hartwell, USdaily high min (Tie)22.8 C (73.0 F)tie112 years10 of 100 (Routine)
23 May 2026Hartwell, USdaily rain48.3 mm (1.9 in)6.1 mm (0.24 in)92 years41 of 100 (Notable)
22 May 2026Hartwell, USdaily high min (Tie)21.1 C (70.0 F)tie29 years4 of 100 (Routine)
7 May 2026Hartwell, USmonthly rain82.6 mm (3.3 in)13.3 mm (0.5 in)5 years31 of 100 (Routine)
11 March 2026Hartwell, USdaily high max28.3 C (82.9 F)0.5 C (0.9 F)36 years20 of 100 (Routine)
11 March 2026Hartwell, USdaily high min14.4 C (57.9 F)0.5 C (0.9 F)25 years17 of 100 (Routine)
10 March 2026Hartwell, USdaily high min14.4 C (57.9 F)0.5 C (0.9 F)116 years40 of 100 (Notable)
9 March 2026Hartwell, USdaily high min (Tie)14.4 C (57.9 F)tie52 years6 of 100 (Routine)
8 March 2026Hartwell, USdaily high min16.1 C (61.0 F)1.1 C (2.0 F)80 years36 of 100 (Notable)
20 February 2026Hartwell, USdaily high min14.4 C (57.9 F)1.1 C (2.0 F)87 years38 of 100 (Notable)
20 February 2026Hartwell, USdaily high max25.6 C (78.1 F)1.2 C (2.2 F)40 years24 of 100 (Routine)
1 February 2026Hartwell, USdaily snowfall8.9 cm (3.5 in)8.9 cm (3.5 in)116 years57 of 100 (Notable)
1 February 2026Hartwell, USdaily low max-1.1 C (30.0 F)3.3 C (5.9 F)90 years43 of 100 (Notable)
26 January 2026Hartwell, USdaily low max (Tie)1.1 C (34.0 F)tie88 years9 of 100 (Routine)
8 January 2026Hartwell, USdaily high max21.7 C (71.1 F)0.6 C (1.1 F)87 years37 of 100 (Notable)
28 December 2025Hartwell, USdaily high max24.4 C (75.9 F)0.5 C (0.9 F)40 years22 of 100 (Routine)
26 December 2025Hartwell, USdaily high max25.0 C (77.0 F)1.7 C (3.1 F)70 years34 of 100 (Routine)

Climate Trend

95 complete years, 1909 to 2025
Annual mean temperature at Hartwell as warming stripes, 1909 to 2025 One stripe for each of 95 complete years at Hartwell, 1909 to 2025. Blue stripes are years cooler than the station's own mean of 16.7 C (62.0 F); red stripes are warmer. The coolest year was 1996, at 15.2 C (59.4 F), and the warmest was 1986, at 18.0 C (64.5 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1909: 16.9 C, +0.2 C from the station mean1917: 15.7 C, -1.0 C from the station mean1920: 15.8 C, -0.9 C from the station mean1921: 17.7 C, +1.1 C from the station mean1922: 17.2 C, +0.5 C from the station mean1923: 16.9 C, +0.2 C from the station mean1925: 17.8 C, +1.1 C from the station mean1926: 16.7 C, 0.0 C from the station mean1927: 17.5 C, +0.8 C from the station mean1928: 16.2 C, -0.5 C from the station mean1929: 16.6 C, -0.1 C from the station mean1930: 16.7 C, 0.0 C from the station mean1931: 17.1 C, +0.5 C from the station mean1932: 17.0 C, +0.4 C from the station mean1933: 17.6 C, +0.9 C from the station mean1934: 16.5 C, -0.2 C from the station mean1935: 16.7 C, 0.0 C from the station mean1936: 16.7 C, 0.0 C from the station mean1937: 16.3 C, -0.4 C from the station mean1938: 17.1 C, +0.5 C from the station mean1939: 17.1 C, +0.5 C from the station mean1940: 15.4 C, -1.3 C from the station mean1941: 16.8 C, +0.2 C from the station mean1942: 16.5 C, -0.2 C from the station mean1943: 16.5 C, -0.2 C from the station mean1944: 16.5 C, -0.1 C from the station mean1945: 16.6 C, -0.1 C from the station mean1946: 17.0 C, +0.3 C from the station mean1947: 16.1 C, -0.6 C from the station mean1948: 16.7 C, 0.0 C from the station mean1950: 16.9 C, +0.2 C from the station mean1951: 17.0 C, +0.3 C from the station mean1952: 17.6 C, +0.9 C from the station mean1953: 17.7 C, +1.0 C from the station mean1954: 17.7 C, +1.0 C from the station mean1955: 17.2 C, +0.6 C from the station mean1956: 17.5 C, +0.8 C from the station mean1957: 17.5 C, +0.8 C from the station mean1958: 16.3 C, -0.4 C from the station mean1959: 17.1 C, +0.5 C from the station mean1960: 16.2 C, -0.5 C from the station mean1963: 16.5 C, -0.2 C from the station mean1965: 17.3 C, +0.7 C from the station mean1966: 16.3 C, -0.3 C from the station mean1967: 16.6 C, -0.1 C from the station mean1969: 16.4 C, -0.2 C from the station mean1970: 17.0 C, +0.3 C from the station mean1971: 17.0 C, +0.3 C from the station mean1972: 17.1 C, +0.4 C from the station mean1973: 16.8 C, +0.1 C from the station mean1974: 17.2 C, +0.6 C from the station mean1975: 17.1 C, +0.4 C from the station mean1976: 15.7 C, -0.9 C from the station mean1977: 16.8 C, +0.1 C from the station mean1978: 16.5 C, -0.2 C from the station mean1979: 15.9 C, -0.7 C from the station mean1981: 16.3 C, -0.4 C from the station mean1982: 17.0 C, +0.4 C from the station mean1983: 16.4 C, -0.3 C from the station mean1984: 16.6 C, -0.1 C from the station mean1985: 17.3 C, +0.6 C from the station mean1986: 18.0 C, +1.4 C from the station mean1990: 17.7 C, +1.0 C from the station mean1993: 16.5 C, -0.2 C from the station mean1994: 15.9 C, -0.8 C from the station mean1996: 15.2 C, -1.5 C from the station mean1997: 15.5 C, -1.2 C from the station mean1998: 17.2 C, +0.6 C from the station mean1999: 16.7 C, 0.0 C from the station mean2000: 16.0 C, -0.7 C from the station mean2001: 16.1 C, -0.5 C from the station mean2002: 16.2 C, -0.5 C from the station mean2003: 15.5 C, -1.2 C from the station mean2004: 16.2 C, -0.5 C from the station mean2005: 16.0 C, -0.7 C from the station mean2006: 16.4 C, -0.3 C from the station mean2007: 16.5 C, -0.1 C from the station mean2008: 15.7 C, -1.0 C from the station mean2009: 15.4 C, -1.2 C from the station mean2010: 15.7 C, -1.0 C from the station mean2011: 16.5 C, -0.2 C from the station mean2012: 17.2 C, +0.5 C from the station mean2013: 15.5 C, -1.2 C from the station mean2014: 15.6 C, -1.1 C from the station mean2015: 16.8 C, +0.1 C from the station mean2016: 17.4 C, +0.8 C from the station mean2017: 17.2 C, +0.5 C from the station mean2018: 16.6 C, 0.0 C from the station mean2019: 17.3 C, +0.6 C from the station mean2020: 16.7 C, 0.0 C from the station mean2021: 16.5 C, -0.1 C from the station mean2022: 16.6 C, -0.1 C from the station mean2023: 16.9 C, +0.3 C from the station mean2024: 17.4 C, +0.7 C from the station mean2025: 16.9 C, +0.2 C from the station mean190919201930194019501960197019801990200020102020
One stripe for each of 95 complete years at Hartwell, 1909 to 2025. Blue stripes are years cooler than the station's own mean of 16.7 C (62.0 F); red stripes are warmer. The coolest year was 1996, at 15.2 C (59.4 F), and the warmest was 1986, at 18.0 C (64.5 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Hartwell as warming stripes, 1909 to 2025
YearAnnual mean temperatureDifference from the station mean
190916.9 C+0.22 C
191715.7 C-1.02 C
192015.8 C-0.90 C
192117.7 C+1.07 C
192217.2 C+0.48 C
192316.9 C+0.23 C
192517.8 C+1.14 C
192616.7 C+0.01 C
192717.5 C+0.80 C
192816.2 C-0.48 C
192916.6 C-0.05 C
193016.7 C+0.02 C
193117.1 C+0.46 C
193217.0 C+0.36 C
193317.6 C+0.93 C
193416.5 C-0.19 C
193516.7 C+0.01 C
193616.7 C-0.01 C
193716.3 C-0.37 C
193817.1 C+0.47 C
193917.1 C+0.47 C
194015.4 C-1.28 C
194116.8 C+0.17 C
194216.5 C-0.16 C
194316.5 C-0.16 C
194416.5 C-0.13 C
194516.6 C-0.05 C
194617.0 C+0.29 C
194716.1 C-0.62 C
194816.7 C+0.02 C
195016.9 C+0.23 C
195117.0 C+0.29 C
195217.6 C+0.89 C
195317.7 C+1.05 C
195417.7 C+0.99 C
195517.2 C+0.56 C
195617.5 C+0.83 C
195717.5 C+0.85 C
195816.3 C-0.38 C
195917.1 C+0.47 C
196016.2 C-0.47 C
196316.5 C-0.18 C
196517.3 C+0.67 C
196616.3 C-0.33 C
196716.6 C-0.06 C
196916.4 C-0.24 C
197017.0 C+0.31 C
197117.0 C+0.34 C
197217.1 C+0.39 C
197316.8 C+0.12 C
197417.2 C+0.56 C
197517.1 C+0.41 C
197615.7 C-0.94 C
197716.8 C+0.10 C
197816.5 C-0.20 C
197915.9 C-0.74 C
198116.3 C-0.40 C
198217.0 C+0.36 C
198316.4 C-0.25 C
198416.6 C-0.08 C
198517.3 C+0.64 C
198618.0 C+1.37 C
199017.7 C+1.05 C
199316.5 C-0.22 C
199415.9 C-0.78 C
199615.2 C-1.46 C
199715.5 C-1.16 C
199817.2 C+0.56 C
199916.7 C-0.01 C
200016.0 C-0.66 C
200116.1 C-0.53 C
200216.2 C-0.48 C
200315.5 C-1.21 C
200416.2 C-0.46 C
200516.0 C-0.65 C
200616.4 C-0.27 C
200716.5 C-0.14 C
200815.7 C-1.02 C
200915.4 C-1.24 C
201015.7 C-1.02 C
201116.5 C-0.19 C
201217.2 C+0.53 C
201315.5 C-1.19 C
201415.6 C-1.07 C
201516.8 C+0.10 C
201617.4 C+0.76 C
201717.2 C+0.55 C
201816.6 C-0.04 C
201917.3 C+0.63 C
202016.7 C+0.03 C
202116.5 C-0.14 C
202216.6 C-0.12 C
202316.9 C+0.26 C
202417.4 C+0.68 C
202516.9 C+0.18 C

The annual mean temperature here has fallen by 0.04 C (0.00 to 0.08) per decade over 1909 to 2025. In Fahrenheit: 0.08 F (0.01 to 0.15) per decade. The slope is a straight line fitted to 95 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Hartwell
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.04 C (-0.08 to 0.00) per decade-0.08 F (-0.15 to -0.01) per decade1909 to 202595Fall
Mean daily maximum-0.2 C (-0.2 to -0.1) per decade-0.3 F (-0.4 to -0.2) per decade1909 to 202595Fall
Mean daily minimum0.1 C (0.1 to 0.1) per decade0.2 F (0.1 to 0.2) per decade1909 to 202595Rise

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

1908 to 2026
Yearly extremes at Hartwell: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.8 C (109.0 F)192537.8 C (100.0 F)119
Coldest night (TNn)-20.6 C (-5.1 F)1940-10.0 C (14.0 F)119
Wettest day (Rx1day)182.9 mm (7.2 in)199477.5 mm (3.1 in)119
Wettest five days (Rx5day)262.1 mm (10.3 in)1908121.2 mm (4.8 in)119
Longest dry spell (CDD)60 days195422 days119

Hottest day (TXx)

Hottest day (TXx) at Hartwell by year The hottest day of the year at Hartwell, 1908 to 2026. The record is 42.8 C (109.0 F) in 1925, marked on the chart; the median year is 37.8 C (100.0 F). 2530354045192019401960198020002020Record: 42.8 C (109.0 F) in 1925
The hottest day of the year at Hartwell, 1908 to 2026. The record is 42.8 C (109.0 F) in 1925, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Hartwell by year
YearHottest day (TXx)
190837.8 C (100.0 F)
190937.8 C (100.0 F)
191037.2 C (99.0 F)
191136.7 C (98.1 F)
191235.0 C (95.0 F)
191338.3 C (100.9 F)
191440.6 C (105.1 F)
191540.6 C (105.1 F)
191637.2 C (99.0 F)
191737.8 C (100.0 F)
191838.9 C (102.0 F)
191936.7 C (98.1 F)
192037.2 C (99.0 F)
192138.9 C (102.0 F)
192236.7 C (98.1 F)
192337.8 C (100.0 F)
192440.0 C (104.0 F)
192542.8 C (109.0 F)
192642.2 C (108.0 F)
192738.3 C (100.9 F)
192836.7 C (98.1 F)
192937.8 C (100.0 F)
193041.7 C (107.1 F)
193140.0 C (104.0 F)
193240.0 C (104.0 F)
193340.0 C (104.0 F)
193438.3 C (100.9 F)
193537.2 C (99.0 F)
193640.0 C (104.0 F)
193738.3 C (100.9 F)
193838.3 C (100.9 F)
193939.4 C (102.9 F)
194038.3 C (100.9 F)
194137.8 C (100.0 F)
194237.2 C (99.0 F)
194338.3 C (100.9 F)
194439.4 C (102.9 F)
194538.9 C (102.0 F)
194636.7 C (98.1 F)
194737.2 C (99.0 F)
194837.8 C (100.0 F)
194937.2 C (99.0 F)
195037.8 C (100.0 F)
195138.9 C (102.0 F)
195242.8 C (109.0 F)
195339.4 C (102.9 F)
195441.1 C (106.0 F)
195538.9 C (102.0 F)
195638.9 C (102.0 F)
195739.4 C (102.9 F)
195837.8 C (100.0 F)
195940.0 C (104.0 F)
196037.8 C (100.0 F)
196127.8 C (82.0 F)
196240.6 C (105.1 F)
196337.2 C (99.0 F)
196439.4 C (102.9 F)
196537.2 C (99.0 F)
196640.0 C (104.0 F)
196735.0 C (95.0 F)
196840.0 C (104.0 F)
196938.3 C (100.9 F)
197040.6 C (105.1 F)
197138.3 C (100.9 F)
197237.8 C (100.0 F)
197335.6 C (96.1 F)
197434.4 C (93.9 F)
197538.9 C (102.0 F)
197636.1 C (97.0 F)
197740.6 C (105.1 F)
197837.8 C (100.0 F)
197935.6 C (96.1 F)
198040.0 C (104.0 F)
198138.3 C (100.9 F)
198236.7 C (98.1 F)
198342.2 C (108.0 F)
198437.8 C (100.0 F)
198537.2 C (99.0 F)
198639.4 C (102.9 F)
198737.8 C (100.0 F)
198836.7 C (98.1 F)
198935.6 C (96.1 F)
199037.2 C (99.0 F)
199137.2 C (99.0 F)
199235.6 C (96.1 F)
199338.3 C (100.9 F)
199433.9 C (93.0 F)
199537.8 C (100.0 F)
199635.6 C (96.1 F)
199735.6 C (96.1 F)
199836.1 C (97.0 F)
199937.8 C (100.0 F)
200036.7 C (98.1 F)
200132.8 C (91.0 F)
200236.1 C (97.0 F)
200331.7 C (89.1 F)
200433.3 C (91.9 F)
200534.4 C (93.9 F)
200636.7 C (98.1 F)
200737.8 C (100.0 F)
200836.7 C (98.1 F)
200935.0 C (95.0 F)
201036.1 C (97.0 F)
201136.7 C (98.1 F)
201240.0 C (104.0 F)
201334.4 C (93.9 F)
201435.6 C (96.1 F)
201536.7 C (98.1 F)
201637.2 C (99.0 F)
201735.0 C (95.0 F)
201835.0 C (95.0 F)
201936.1 C (97.0 F)
202034.4 C (93.9 F)
202134.4 C (93.9 F)
202237.8 C (100.0 F)
202336.1 C (97.0 F)
202437.8 C (100.0 F)
202536.7 C (98.1 F)
202637.8 C (100.0 F)

Coldest night (TNn)

Coldest night (TNn) at Hartwell by year The coldest night of the year at Hartwell, 1908 to 2026. The record is -20.6 C (-5.1 F) in 1940, marked on the chart; the median year is -10.0 C (14.0 F). -25-20-15-10-50192019401960198020002020Record: -20.6 C (-5.1 F) in 1940
The coldest night of the year at Hartwell, 1908 to 2026. The record is -20.6 C (-5.1 F) in 1940, marked on the chart; the median year is -10.0 C (14.0 F).
Coldest night (TNn) at Hartwell by year
YearColdest night (TNn)
1908-2.8 C (27.0 F)
1909-12.2 C (10.0 F)
1910-11.7 C (10.9 F)
1911-5.6 C (21.9 F)
1912-12.2 C (10.0 F)
1913-5.6 C (21.9 F)
1914-8.9 C (16.0 F)
1915-4.4 C (24.1 F)
1916-7.8 C (18.0 F)
1917-14.4 C (6.1 F)
1918-15.0 C (5.0 F)
1919-12.2 C (10.0 F)
1920-12.8 C (9.0 F)
1921-4.4 C (24.1 F)
1922-7.8 C (18.0 F)
1923-8.9 C (16.0 F)
1924-9.4 C (15.1 F)
1925-13.3 C (8.1 F)
1926-6.7 C (19.9 F)
1927-12.2 C (10.0 F)
1928-16.1 C (3.0 F)
1929-9.4 C (15.1 F)
1930-8.9 C (16.0 F)
1931-8.3 C (17.1 F)
1932-8.9 C (16.0 F)
1933-11.7 C (10.9 F)
1934-12.8 C (9.0 F)
1935-11.1 C (12.0 F)
1936-14.4 C (6.1 F)
1937-12.2 C (10.0 F)
1938-9.4 C (15.1 F)
1939-8.3 C (17.1 F)
1940-20.6 C (-5.1 F)
1941-7.8 C (18.0 F)
1942-12.2 C (10.0 F)
1943-12.2 C (10.0 F)
1944-9.4 C (15.1 F)
1945-10.0 C (14.0 F)
1946-8.9 C (16.0 F)
1947-9.4 C (15.1 F)
1948-12.8 C (9.0 F)
1949-5.6 C (21.9 F)
1950-13.9 C (7.0 F)
1951-11.1 C (12.0 F)
1952-10.0 C (14.0 F)
1953-10.0 C (14.0 F)
1954-7.8 C (18.0 F)
1955-10.6 C (12.9 F)
1956-6.7 C (19.9 F)
1957-12.2 C (10.0 F)
1958-15.6 C (3.9 F)
1959-12.2 C (10.0 F)
1960-12.8 C (9.0 F)
1961-12.2 C (10.0 F)
1962-15.6 C (3.9 F)
1963-14.4 C (6.1 F)
1964-8.9 C (16.0 F)
1965-9.4 C (15.1 F)
1966-18.9 C (-2.0 F)
1967-13.9 C (7.0 F)
1968-9.4 C (15.1 F)
1969-9.4 C (15.1 F)
1970-17.2 C (1.0 F)
1971-12.2 C (10.0 F)
1972-12.2 C (10.0 F)
1973-9.4 C (15.1 F)
1974-8.9 C (16.0 F)
1975-11.7 C (10.9 F)
1976-11.1 C (12.0 F)
1977-14.4 C (6.1 F)
1978-11.1 C (12.0 F)
1979-12.2 C (10.0 F)
1980-11.7 C (10.9 F)
1981-11.7 C (10.9 F)
1982-17.8 C (0.0 F)
1983-16.1 C (3.0 F)
1984-10.0 C (14.0 F)
1985-20.6 C (-5.1 F)
1986-14.4 C (6.1 F)
1987-5.6 C (21.9 F)
1988-8.3 C (17.1 F)
1989-11.7 C (10.9 F)
1990-5.0 C (23.0 F)
1991-11.7 C (10.9 F)
1992-6.7 C (19.9 F)
1993-7.8 C (18.0 F)
1994-13.9 C (7.0 F)
1995-11.7 C (10.9 F)
1996-13.9 C (7.0 F)
1997-8.9 C (16.0 F)
1998-7.2 C (19.0 F)
1999-10.0 C (14.0 F)
2000-10.0 C (14.0 F)
2001-8.3 C (17.1 F)
2002-7.8 C (18.0 F)
2003-12.2 C (10.0 F)
2004-8.9 C (16.0 F)
2005-8.9 C (16.0 F)
2006-6.7 C (19.9 F)
2007-8.3 C (17.1 F)
2008-9.4 C (15.1 F)
2009-10.0 C (14.0 F)
2010-10.0 C (14.0 F)
2011-7.8 C (18.0 F)
2012-7.2 C (19.0 F)
2013-5.6 C (21.9 F)
2014-14.4 C (6.1 F)
2015-12.2 C (10.0 F)
2016-7.2 C (19.0 F)
2017-8.3 C (17.1 F)
2018-11.1 C (12.0 F)
2019-5.6 C (21.9 F)
2020-7.2 C (19.0 F)
2021-7.2 C (19.0 F)
2022-13.3 C (8.1 F)
2023-5.0 C (23.0 F)
2024-11.1 C (12.0 F)
2025-7.8 C (18.0 F)
2026-10.0 C (14.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Hartwell by year The wettest day of the year at Hartwell, 1908 to 2026. The record is 182.9 mm (7.2 in) in 1994, marked on the chart; the median year is 77.5 mm (3.1 in). 050100150200192019401960198020002020Record: 182.9 mm (7.2 in) in 1994
The wettest day of the year at Hartwell, 1908 to 2026. The record is 182.9 mm (7.2 in) in 1994, marked on the chart; the median year is 77.5 mm (3.1 in).
Wettest day (Rx1day) at Hartwell by year
YearWettest day (Rx1day)
1908182.1 mm (7.2 in)
190955.9 mm (2.2 in)
191050.8 mm (2.0 in)
191150.5 mm (2.0 in)
1912108.0 mm (4.3 in)
191358.2 mm (2.3 in)
191450.0 mm (2.0 in)
191572.1 mm (2.8 in)
191647.8 mm (1.9 in)
191747.0 mm (1.9 in)
191872.4 mm (2.9 in)
191996.0 mm (3.8 in)
192065.0 mm (2.6 in)
192183.8 mm (3.3 in)
192255.9 mm (2.2 in)
192357.2 mm (2.3 in)
192456.4 mm (2.2 in)
192549.5 mm (1.9 in)
192654.6 mm (2.1 in)
192764.5 mm (2.5 in)
192847.2 mm (1.9 in)
1929100.3 mm (3.9 in)
193056.6 mm (2.2 in)
1931110.5 mm (4.4 in)
1932123.2 mm (4.9 in)
193381.0 mm (3.2 in)
193455.9 mm (2.2 in)
193583.8 mm (3.3 in)
1936109.2 mm (4.3 in)
1937101.6 mm (4.0 in)
193852.6 mm (2.1 in)
1939111.8 mm (4.4 in)
1940161.8 mm (6.4 in)
194155.1 mm (2.2 in)
194276.7 mm (3.0 in)
1943111.5 mm (4.4 in)
194485.1 mm (3.4 in)
194555.6 mm (2.2 in)
194678.5 mm (3.1 in)
194755.9 mm (2.2 in)
194867.3 mm (2.6 in)
194957.2 mm (2.3 in)
195080.0 mm (3.1 in)
195149.0 mm (1.9 in)
195287.6 mm (3.4 in)
195358.4 mm (2.3 in)
195459.7 mm (2.4 in)
195557.2 mm (2.3 in)
1956161.3 mm (6.4 in)
1957129.5 mm (5.1 in)
195862.2 mm (2.4 in)
195969.9 mm (2.8 in)
196087.6 mm (3.4 in)
196161.2 mm (2.4 in)
196278.7 mm (3.1 in)
196399.6 mm (3.9 in)
1964152.4 mm (6.0 in)
1965114.0 mm (4.5 in)
196686.4 mm (3.4 in)
1967142.5 mm (5.6 in)
196888.9 mm (3.5 in)
196990.9 mm (3.6 in)
197061.0 mm (2.4 in)
197157.9 mm (2.3 in)
197297.0 mm (3.8 in)
1973109.2 mm (4.3 in)
197486.4 mm (3.4 in)
197583.8 mm (3.3 in)
197671.1 mm (2.8 in)
197790.4 mm (3.6 in)
197867.3 mm (2.6 in)
197992.2 mm (3.6 in)
198076.2 mm (3.0 in)
198191.4 mm (3.6 in)
198287.6 mm (3.4 in)
198354.6 mm (2.1 in)
198459.7 mm (2.4 in)
198563.5 mm (2.5 in)
198678.7 mm (3.1 in)
198783.8 mm (3.3 in)
198847.8 mm (1.9 in)
1989106.7 mm (4.2 in)
1990127.0 mm (5.0 in)
199176.2 mm (3.0 in)
1992115.1 mm (4.5 in)
199395.5 mm (3.8 in)
1994182.9 mm (7.2 in)
199571.1 mm (2.8 in)
199668.6 mm (2.7 in)
199777.5 mm (3.1 in)
199878.0 mm (3.1 in)
199988.9 mm (3.5 in)
200069.3 mm (2.7 in)
200191.4 mm (3.6 in)
200261.7 mm (2.4 in)
2003102.9 mm (4.1 in)
2004149.9 mm (5.9 in)
200571.4 mm (2.8 in)
200673.2 mm (2.9 in)
200759.2 mm (2.3 in)
2008101.6 mm (4.0 in)
2009130.8 mm (5.1 in)
201063.5 mm (2.5 in)
201148.8 mm (1.9 in)
201251.3 mm (2.0 in)
201388.9 mm (3.5 in)
2014165.1 mm (6.5 in)
2015123.7 mm (4.9 in)
201650.5 mm (2.0 in)
201763.5 mm (2.5 in)
2018106.7 mm (4.2 in)
201958.4 mm (2.3 in)
202091.7 mm (3.6 in)
202161.0 mm (2.4 in)
202264.5 mm (2.5 in)
202395.3 mm (3.8 in)
2024134.6 mm (5.3 in)
202557.2 mm (2.3 in)
202682.6 mm (3.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Hartwell by year The wettest five days of the year at Hartwell, 1908 to 2026. The record is 262.1 mm (10.3 in) in 1908, marked on the chart; the median year is 121.2 mm (4.8 in). 50100150200250300192019401960198020002020Record: 262.1 mm (10.3 in) in 1908
The wettest five days of the year at Hartwell, 1908 to 2026. The record is 262.1 mm (10.3 in) in 1908, marked on the chart; the median year is 121.2 mm (4.8 in).
Wettest five days (Rx5day) at Hartwell by year
YearWettest five days (Rx5day)
1908262.1 mm (10.3 in)
1909118.4 mm (4.7 in)
191084.6 mm (3.3 in)
191175.9 mm (3.0 in)
1912123.0 mm (4.8 in)
1913100.1 mm (3.9 in)
191483.0 mm (3.3 in)
191579.5 mm (3.1 in)
191687.6 mm (3.4 in)
1917101.7 mm (4.0 in)
1918110.9 mm (4.4 in)
1919192.3 mm (7.6 in)
1920116.7 mm (4.6 in)
1921171.9 mm (6.8 in)
1922118.9 mm (4.7 in)
192388.4 mm (3.5 in)
192492.4 mm (3.6 in)
1925120.4 mm (4.7 in)
1926117.3 mm (4.6 in)
1927121.4 mm (4.8 in)
1928102.0 mm (4.0 in)
1929142.2 mm (5.6 in)
1930112.3 mm (4.4 in)
1931146.1 mm (5.8 in)
1932194.1 mm (7.6 in)
1933135.6 mm (5.3 in)
1934112.3 mm (4.4 in)
1935193.6 mm (7.6 in)
1936182.4 mm (7.2 in)
1937128.7 mm (5.1 in)
1938145.6 mm (5.7 in)
1939149.7 mm (5.9 in)
1940221.0 mm (8.7 in)
1941101.6 mm (4.0 in)
194293.4 mm (3.7 in)
1943121.7 mm (4.8 in)
1944119.4 mm (4.7 in)
194598.0 mm (3.9 in)
194698.4 mm (3.9 in)
1947108.8 mm (4.3 in)
1948148.3 mm (5.8 in)
1949136.1 mm (5.4 in)
1950138.1 mm (5.4 in)
1951100.4 mm (4.0 in)
1952156.3 mm (6.2 in)
1953114.8 mm (4.5 in)
195481.8 mm (3.2 in)
195584.6 mm (3.3 in)
1956180.4 mm (7.1 in)
1957211.2 mm (8.3 in)
195892.8 mm (3.7 in)
1959132.5 mm (5.2 in)
1960148.0 mm (5.8 in)
1961182.8 mm (7.2 in)
1962120.2 mm (4.7 in)
1963165.1 mm (6.5 in)
1964220.9 mm (8.7 in)
1965164.3 mm (6.5 in)
1966129.0 mm (5.1 in)
1967146.6 mm (5.8 in)
1968107.6 mm (4.2 in)
1969213.4 mm (8.4 in)
1970114.3 mm (4.5 in)
1971134.1 mm (5.3 in)
1972165.6 mm (6.5 in)
1973171.5 mm (6.8 in)
1974108.1 mm (4.3 in)
1975151.1 mm (5.9 in)
1976127.0 mm (5.0 in)
1977125.4 mm (4.9 in)
1978142.1 mm (5.6 in)
1979113.5 mm (4.5 in)
1980176.6 mm (7.0 in)
1981125.7 mm (4.9 in)
1982118.1 mm (4.6 in)
1983161.3 mm (6.4 in)
1984105.1 mm (4.1 in)
1985108.0 mm (4.3 in)
198695.3 mm (3.8 in)
1987123.4 mm (4.9 in)
198866.9 mm (2.6 in)
1989172.8 mm (6.8 in)
1990216.0 mm (8.5 in)
1991111.7 mm (4.4 in)
1992182.0 mm (7.2 in)
1993112.9 mm (4.4 in)
1994111.9 mm (4.4 in)
1995126.6 mm (5.0 in)
1996137.2 mm (5.4 in)
1997103.4 mm (4.1 in)
1998141.0 mm (5.6 in)
1999111.8 mm (4.4 in)
2000101.6 mm (4.0 in)
2001148.3 mm (5.8 in)
2002159.7 mm (6.3 in)
2003115.8 mm (4.6 in)
2004202.5 mm (8.0 in)
2005120.4 mm (4.7 in)
2006107.7 mm (4.2 in)
200780.8 mm (3.2 in)
2008104.6 mm (4.1 in)
2009140.5 mm (5.5 in)
201087.1 mm (3.4 in)
201183.3 mm (3.3 in)
201292.7 mm (3.6 in)
2013199.8 mm (7.9 in)
2014255.3 mm (10.1 in)
2015176.5 mm (6.9 in)
201698.6 mm (3.9 in)
2017110.3 mm (4.3 in)
2018131.4 mm (5.2 in)
201984.1 mm (3.3 in)
2020172.9 mm (6.8 in)
2021200.5 mm (7.9 in)
2022103.4 mm (4.1 in)
2023112.3 mm (4.4 in)
2024206.8 mm (8.1 in)
2025101.6 mm (4.0 in)
2026121.2 mm (4.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Hartwell by year The longest dry spell of the year at Hartwell, 1908 to 2026. The record is 60 days in 1954, marked on the chart; the median year is 22 days. 0204060192019401960198020002020Record: 60 days in 1954
The longest dry spell of the year at Hartwell, 1908 to 2026. The record is 60 days in 1954, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Hartwell by year
YearLongest dry spell (CDD)
190821 days
190939 days
191027 days
191116 days
191217 days
191311 days
191427 days
191522 days
191635 days
191720 days
191818 days
191920 days
192032 days
192126 days
192217 days
192317 days
192420 days
192528 days
192619 days
192729 days
192821 days
192923 days
193024 days
193119 days
193214 days
193333 days
193418 days
193538 days
193622 days
193715 days
193835 days
193923 days
194025 days
194126 days
194224 days
194321 days
194428 days
194515 days
194615 days
194717 days
194817 days
194918 days
195026 days
195126 days
195230 days
195324 days
195460 days
195523 days
195620 days
195720 days
195828 days
195924 days
196016 days
196112 days
196220 days
196321 days
196422 days
196520 days
196614 days
196729 days
196821 days
196920 days
197025 days
197124 days
197247 days
197329 days
197425 days
197520 days
197628 days
197723 days
197838 days
197923 days
198031 days
198131 days
198223 days
198326 days
198423 days
198528 days
198618 days
198736 days
198817 days
198934 days
199023 days
199116 days
199219 days
199326 days
19944 days
199518 days
199615 days
199726 days
199821 days
199923 days
200039 days
200129 days
200217 days
200319 days
200412 days
200543 days
200621 days
200719 days
200819 days
200914 days
201016 days
201118 days
201216 days
201314 days
201432 days
201518 days
201635 days
201726 days
201818 days
201924 days
202012 days
202115 days
202231 days
202324 days
202429 days
202516 days
202619 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

95 years with a frost

Across 95 years with a frost, the median last spring frost at Hartwell falls on 25 March and the median first autumn frost on 9 November, which leaves a median of 226 days between them.

In 1996 to 2025 the median growing season was 238 days. That is 22 days more than in 1909 to 1948.

Fitted over all years, the growing season changes by +3.1 days per decade at this station.

Frost dates and growing season at Hartwell
MeasureMedian, all yearsEarliest period (1909 to 1948)Recent period (1996 to 2025)Recent against earliestFitted trend
Last spring frost25 March30 March23 March7 days earlier-1.1 days per decade
First autumn frost9 November2 November17 November15 days later+1.9 days per decade
Growing days226 days216 days238 days22 days more+3.1 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

101 years, 1909 to 2025

A day with at least 76.4 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 187.0 mm (7.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Hartwell: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years76.4 mm (3.0 in)
5 years101.7 mm (4.0 in)
10 years120.1 mm (4.7 in)
25 years145.3 mm (5.7 in)
50 years165.5 mm (6.5 in)
100 years187.0 mm (7.4 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 101 years of values from 1909 to 2025.

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: 165.1 mm (6.5 in) in 2014; 161.8 mm (6.4 in) in 1940; 161.3 mm (6.4 in) in 1956.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Climate Twins

2011 to 2025 against 1961 to 1990

Over 2011 to 2025, Hartwell had a mean temperature of 16.7 C (62.1 F) and 1,281.4 mm (50.4 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are W Pt (United States, 265 km away), Warrenton (United States, 109 km away) and Pelion 0.8 NW (United States, 167 km away).

Climate twins of Hartwell: stations whose 1961 to 1990 climate is closest to its 2011 to 2025 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
W PtUnited States265 km (165 mi)16.8 C (62.2 F)1,323.9 mm (52.1 in)0.44
WarrentonUnited States109 km (68 mi)16.8 C (62.3 F)1,279.0 mm (50.4 in)0.46
Pelion 0.8 NWUnited States167 km (104 mi)16.9 C (62.4 F)1,269.8 mm (50.0 in)0.47

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

  • Data for Hartwell standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Hartwell 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).