Built 2026-10-15 (15 October 2026)

Louisa Weather Records (USC00445050)

Record envelope, standing records and threshold days for Louisa (USC00445050), Virginia, United States, with 111 years of record.

Key Facts for Louisa

  • Louisa (USC00445050) is a weather station in Virginia, United States at 38.04 latitude and -78.01 longitude, 128 m (420 ft) above sea level.
  • The station reports from 1916 to 2026, 111 years of record.
  • 1,464 records set at Louisa still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Louisa set a daily record high minimum temperature of 22.2 C (72.0 F) on 13 September 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Virginia, United States, 38.04 latitude, -78.01 longitude.
  • Elevation: 128 m (420 ft).
  • Period of record: 1916 to 2026, 111 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

18 days at or beyond a record
Daily record high and record low at Louisa, with 2026 drawn through them The band shows the record high and record low for each calendar day at Louisa. The lines show the 2026 daily maximum and minimum. 18 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 Louisa. The lines show the 2026 daily maximum and minimum. 18 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Louisa, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan26.7 C (80.1 F)-28.9 C (-20.0 F)21.1 C (70.0 F)-13.9 C (7.0 F)
Feb27.8 C (82.0 F)-29.4 C (-20.9 F)20.6 C (69.1 F)-16.7 C (1.9 F)
Mar31.7 C (89.1 F)-20.6 C (-5.1 F)31.1 C (88.0 F)-5.6 C (21.9 F)
Apr35.6 C (96.1 F)-10.6 C (12.9 F)33.3 C (91.9 F)-3.9 C (25.0 F)
May37.2 C (99.0 F)-3.3 C (26.1 F)36.1 C (97.0 F)2.2 C (36.0 F)
Jun38.3 C (100.9 F)2.2 C (36.0 F)36.1 C (97.0 F)6.7 C (44.1 F)
Jul42.2 C (108.0 F)2.8 C (37.0 F)38.9 C (102.0 F)14.4 C (57.9 F)
Aug40.6 C (105.1 F)2.2 C (36.0 F)34.4 C (93.9 F)12.8 C (55.0 F)
Sep40.0 C (104.0 F)-1.7 C (28.9 F)36.7 C (98.1 F)6.7 C (44.1 F)
Oct36.7 C (98.1 F)-7.8 C (18.0 F)32.2 C (90.0 F)-0.6 C (30.9 F)
Nov31.1 C (88.0 F)-15.6 C (3.9 F)n/an/a
Dec26.1 C (79.0 F)-22.8 C (-9.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Louisa by the year they were set 1,464 records at Louisa still stand. 1930 holds the most, with 46. 02040601916: 91917: 241918: 261919: 171920: 91921: 161922: 141923: 201924: 141925: 371926: 221927: 251928: 131929: 401930: 461931: 131932: 161933: 201934: 201935: 101936: 141937: 171938: 101939: 251940: 161941: 241942: 191943: 141944: 111945: 181946: 61947: 161948: 101949: 91950: 201951: 141952: 141953: 131954: 261955: 51956: 171957: 121958: 71959: 101960: 171961: 141962: 81963: 171964: 131965: 101966: 121967: 101968: 51969: 81970: 101971: 141972: 121973: 61974: 121975: 61976: 81977: 91978: 41979: 121980: 111981: 91982: 131983: 161984: 161985: 121986: 151987: 41988: 201989: 211990: 161991: 141992: 91993: 91994: 121995: 51996: 131997: 131998: 141999: 32000: 52001: 162002: 192003: 72004: 72005: 42006: 82007: 52008: 102009: 102010: 122011: 122012: 102013: 102014: 52015: 162016: 62017: 122018: 142019: 32020: 72021: 52022: 62023: 52024: 112025: 92026: 201916192819401952196419761988200020122024
1,464 records at Louisa still stand. 1930 holds the most, with 46.
Standing records at Louisa by the year they were set
Year setStanding records
19169
191724
191826
191917
19209
192116
192214
192320
192414
192537
192622
192725
192813
192940
193046
193113
193216
193320
193420
193510
193614
193717
193810
193925
194016
194124
194219
194314
194411
194518
19466
194716
194810
19499
195020
195114
195214
195313
195426
19555
195617
195712
19587
195910
196017
196114
19628
196317
196413
196510
196612
196710
19685
19698
197010
197114
197212
19736
197412
19756
19768
19779
19784
197912
198011
19819
198213
198316
198416
198512
198615
19874
198820
198921
199016
199114
19929
19939
199412
19955
199613
199713
199814
19993
20005
200116
200219
20037
20047
20054
20068
20075
200810
200910
201012
201112
201210
201310
20145
201516
20166
201712
201814
20193
20207
20215
20226
20235
202411
20259
202620

All-Time Record Progression

7 new records
When Louisa set new all-time records 7 all-time records were set at Louisa between 26 January 1961 and 19 December 2009. Each dot is a new record. Record low maximum temperatureRecord daily precipitationRecord daily snowfallRecord low minimum temperature26 January 1961: Record low maximum temperature -9.4 C (15.1 F)20 August 1969: Record daily precipitation 284.0 mm (11.2 in)9 January 1970: Record low maximum temperature -11.1 C (12.0 F)22 January 1987: Record daily snowfall 39.4 cm (15.5 in)7 January 1996: Record daily snowfall 40.6 cm (16.0 in)5 February 1996: Record low minimum temperature -29.4 C (-20.9 F)19 December 2009: Record daily snowfall 45.2 cm (17.8 in)19701980199020002010
7 all-time records were set at Louisa between 26 January 1961 and 19 December 2009. Each dot is a new record.
When Louisa set new all-time records
DateKindDetail
1961-01-26Record low maximum temperatureRecord low maximum temperature -9.4 C (15.1 F)
1969-08-20Record daily precipitationRecord daily precipitation 284.0 mm (11.2 in)
1970-01-09Record low maximum temperatureRecord low maximum temperature -11.1 C (12.0 F)
1987-01-22Record daily snowfallRecord daily snowfall 39.4 cm (15.5 in)
1996-01-07Record daily snowfallRecord daily snowfall 40.6 cm (16.0 in)
1996-02-05Record low minimum temperatureRecord low minimum temperature -29.4 C (-20.9 F)
2009-12-19Record daily snowfallRecord daily snowfall 45.2 cm (17.8 in)

Wettest Day of Each Month

Aug: 284.0 mm (11.2 in)
Record daily precipitation for each month at Louisa The wettest day on record for each calendar month at Louisa. The most was 284.0 mm (11.2 in) on 20 August 1969. 0100200300 Jan: 63.5 mm (2.5 in), 24 January 1940 Jan Feb: 101.1 mm (4.0 in), 14 February 1984 Feb Mar: 99.1 mm (3.9 in), 4 March 1993 Mar Apr: 97.3 mm (3.8 in), 26 April 1937 Apr May: 67.3 mm (2.6 in), 9 May 2008 May Jun: 165.4 mm (6.5 in), 26 June 1975 Jun Jul: 131.6 mm (5.2 in), 22 July 1956 Jul Aug: 284.0 mm (11.2 in), 20 August 1969 Aug Sep: 116.6 mm (4.6 in), 6 September 1996 Sep Oct: 143.0 mm (5.6 in), 22 October 1929 Oct Nov: 146.3 mm (5.8 in), 28 November 1993 Nov Dec: 80.8 mm (3.2 in), 10 December 1992 Dec
The wettest day on record for each calendar month at Louisa. The most was 284.0 mm (11.2 in) on 20 August 1969.
Record daily precipitation for each month at Louisa
MonthRecord daily precipitation (mm)Date
Jan63.5 mm (2.5 in)24 January 1940
Feb101.1 mm (4.0 in)14 February 1984
Mar99.1 mm (3.9 in)4 March 1993
Apr97.3 mm (3.8 in)26 April 1937
May67.3 mm (2.6 in)9 May 2008
Jun165.4 mm (6.5 in)26 June 1975
Jul131.6 mm (5.2 in)22 July 1956
Aug284.0 mm (11.2 in)20 August 1969
Sep116.6 mm (4.6 in)6 September 1996
Oct143.0 mm (5.6 in)22 October 1929
Nov146.3 mm (5.8 in)28 November 1993
Dec80.8 mm (3.2 in)10 December 1992

Period of Record Coverage

1916 to 2026
Days with data per year at Louisa 111 years of record at Louisa, 1916 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1916, 1917, 1919, 1920, 1922, 1928, 1934, 1940 and others. 1916: 231 of 366 days1917: 320 of 365 days1918: 342 of 365 days1919: 328 of 365 days1920: 328 of 366 days1921: 351 of 365 days1922: 323 of 365 days1923: 356 of 365 days1924: 360 of 366 days1925: 358 of 365 days1926: 355 of 365 days1927: 353 of 365 days1928: 327 of 366 days1929: 361 of 365 days1930: 350 of 365 days1931: 349 of 365 days1932: 356 of 366 days1933: 354 of 365 days1934: 327 of 365 days1935: 344 of 365 days1936: 360 of 366 days1937: 347 of 365 days1938: 356 of 365 days1939: 347 of 365 days1940: 259 of 366 days1941: 330 of 365 days1942: 363 of 365 days1943: 361 of 365 days1944: 364 of 366 days1945: 360 of 365 days1946: 360 of 365 days1947: 362 of 365 days1948: 365 of 366 days1949: 363 of 365 days1950: 365 of 365 days1951: 365 of 365 days1952: 366 of 366 days1953: 365 of 365 days1954: 364 of 365 days1955: 365 of 365 days1956: 365 of 366 days1957: 364 of 365 days1958: 365 of 365 days1959: 363 of 365 days1960: 366 of 366 days1961: 365 of 365 days1962: 363 of 365 days1963: 365 of 365 days1964: 365 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 334 of 366 days1969: 365 of 365 days1970: 364 of 365 days1971: 364 of 365 days1972: 365 of 366 days1973: 362 of 365 days1974: 365 of 365 days1975: 362 of 365 days1976: 361 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 363 of 365 days1980: 363 of 366 days1981: 362 of 365 days1982: 359 of 365 days1983: 360 of 365 days1984: 355 of 366 days1985: 356 of 365 days1986: 348 of 365 days1987: 346 of 365 days1988: 344 of 366 days1989: 348 of 365 days1990: 360 of 365 days1991: 363 of 365 days1992: 365 of 366 days1993: 363 of 365 days1994: 359 of 365 days1995: 362 of 365 days1996: 357 of 366 days1997: 349 of 365 days1998: 352 of 365 days1999: 364 of 365 days2000: 355 of 366 days2001: 359 of 365 days2002: 363 of 365 days2003: 363 of 365 days2004: 365 of 366 days2005: 362 of 365 days2006: 361 of 365 days2007: 364 of 365 days2008: 366 of 366 days2009: 364 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 364 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 282 of 365 days19201935195019651980199520102025
111 years of record at Louisa, 1916 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1916, 1917, 1919, 1920, 1922, 1928, 1934, 1940 and others.
Days with data per year at Louisa
YearDays with dataShare of yearComplete
191623163%No
191732088%No
191834294%Yes
191932890%No
192032890%No
192135196%Yes
192232388%No
192335698%Yes
192436098%Yes
192535898%Yes
192635597%Yes
192735397%Yes
192832789%No
192936199%Yes
193035096%Yes
193134996%Yes
193235697%Yes
193335497%Yes
193432790%No
193534494%Yes
193636098%Yes
193734795%Yes
193835698%Yes
193934795%Yes
194025971%No
194133090%Yes
194236399%Yes
194336199%Yes
194436499%Yes
194536099%Yes
194636099%Yes
194736299%Yes
1948365100%Yes
194936399%Yes
1950365100%Yes
1951365100%Yes
1952366100%Yes
1953365100%Yes
1954364100%Yes
1955365100%Yes
1956365100%Yes
1957364100%Yes
1958365100%Yes
195936399%Yes
1960366100%Yes
1961365100%Yes
196236399%Yes
1963365100%Yes
1964365100%Yes
1965365100%Yes
1966365100%Yes
1967365100%Yes
196833491%Yes
1969365100%Yes
1970364100%Yes
1971364100%Yes
1972365100%Yes
197336299%Yes
1974365100%Yes
197536299%Yes
197636199%Yes
1977365100%Yes
1978365100%Yes
197936399%Yes
198036399%Yes
198136299%Yes
198235998%Yes
198336099%Yes
198435597%Yes
198535698%Yes
198634895%Yes
198734695%Yes
198834494%Yes
198934895%Yes
199036099%Yes
199136399%Yes
1992365100%Yes
199336399%Yes
199435998%Yes
199536299%Yes
199635798%Yes
199734996%Yes
199835296%Yes
1999364100%Yes
200035597%Yes
200135998%Yes
200236399%Yes
200336399%Yes
2004365100%Yes
200536299%Yes
200636199%Yes
2007364100%Yes
2008366100%Yes
2009364100%Yes
2010365100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018364100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628277%No

Latest Records

20
Latest records at Louisa
DateStationRecordValueBeat old record byOld record stoodSignificance
13 September 2026Louisa, USdaily high min (Provisional)22.2 C (72.0 F)0.5 C (0.9 F)109 years41 of 100 (Notable)
11 September 2026Louisa, USdaily high min (Tie, Provisional)21.1 C (70.0 F)tie64 years7 of 100 (Routine)
4 September 2026Louisa, USdaily high max (Tie, Provisional)36.7 C (98.1 F)tie79 years8 of 100 (Routine)
6 August 2026Louisa, USdaily high min (Tie)22.8 C (73.0 F)tie64 years7 of 100 (Routine)
4 August 2026Louisa, USdaily high min24.4 C (75.9 F)1.1 C (2.0 F)63 years31 of 100 (Routine)
3 August 2026Louisa, USdaily high min (Tie)22.8 C (73.0 F)tie15 years3 of 100 (Routine)
2 August 2026Louisa, USdaily high min (Tie)22.8 C (73.0 F)tie95 years9 of 100 (Routine)
4 July 2026Louisa, USdaily high max38.9 C (102.0 F)1.7 C (3.1 F)27 years23 of 100 (Routine)
3 July 2026Louisa, USdaily high max38.9 C (102.0 F)1.1 C (2.0 F)72 years34 of 100 (Routine)
3 July 2026Louisa, USdaily high min (Tie)22.2 C (72.0 F)tie45 years5 of 100 (Routine)
2 July 2026Louisa, USdaily high max37.8 C (100.0 F)0.6 C (1.1 F)72 years32 of 100 (Routine)
12 June 2026Louisa, USdaily high max36.1 C (97.0 F)1.7 C (3.1 F)84 years39 of 100 (Notable)
11 June 2026Louisa, USdaily high max35.6 C (96.1 F)0.6 C (1.1 F)79 years34 of 100 (Routine)
23 May 2026Louisa, USdaily low max13.9 C (57.0 F)0.5 C (0.9 F)23 years17 of 100 (Routine)
22 May 2026Louisa, USdaily rain39.6 mm (1.6 in)3.5 mm (0.14 in)24 years20 of 100 (Routine)
21 May 2026Louisa, USdaily high max35.0 C (95.0 F)0.6 C (1.1 F)84 years36 of 100 (Notable)
20 May 2026Louisa, USdaily high max (Tie)35.6 C (96.1 F)tie29 years4 of 100 (Routine)
19 May 2026Louisa, USdaily high max36.1 C (97.0 F)1.1 C (2.0 F)29 years20 of 100 (Routine)
18 May 2026Louisa, USdaily high max35.6 C (96.1 F)2.3 C (4.1 F)89 years40 of 100 (Notable)
17 May 2026Louisa, USdaily high max33.9 C (93.0 F)0.6 C (1.1 F)8 years13 of 100 (Routine)

Climate Trend

99 complete years, 1918 to 2025
Annual mean temperature at Louisa as warming stripes, 1918 to 2025 One stripe for each of 99 complete years at Louisa, 1918 to 2025. Blue stripes are years cooler than the station's own mean of 13.4 C (56.2 F); red stripes are warmer. The coolest year was 1924, at 11.4 C (52.5 F), and the warmest was 1990, at 15.0 C (59.0 F). The strongest colour marks a difference of 2.1 C (3.8 F). 1918: 12.4 C, -1.1 C from the station mean1921: 14.0 C, +0.6 C from the station mean1923: 12.5 C, -1.0 C from the station mean1924: 11.4 C, -2.1 C from the station mean1925: 13.0 C, -0.4 C from the station mean1926: 11.6 C, -1.9 C from the station mean1927: 12.8 C, -0.6 C from the station mean1929: 12.5 C, -0.9 C from the station mean1930: 13.4 C, 0.0 C from the station mean1931: 14.1 C, +0.7 C from the station mean1932: 13.9 C, +0.5 C from the station mean1933: 13.8 C, +0.4 C from the station mean1936: 13.1 C, -0.4 C from the station mean1937: 13.0 C, -0.4 C from the station mean1938: 13.9 C, +0.5 C from the station mean1939: 13.5 C, 0.0 C from the station mean1942: 13.2 C, -0.3 C from the station mean1943: 13.9 C, +0.5 C from the station mean1944: 13.7 C, +0.2 C from the station mean1945: 13.9 C, +0.5 C from the station mean1946: 14.1 C, +0.6 C from the station mean1947: 13.2 C, -0.3 C from the station mean1948: 13.3 C, -0.1 C from the station mean1949: 14.5 C, +1.1 C from the station mean1950: 13.6 C, +0.2 C from the station mean1951: 13.9 C, +0.4 C from the station mean1952: 14.0 C, +0.6 C from the station mean1953: 14.7 C, +1.3 C from the station mean1954: 14.0 C, +0.6 C from the station mean1955: 13.5 C, +0.1 C from the station mean1956: 13.8 C, +0.3 C from the station mean1957: 13.9 C, +0.4 C from the station mean1958: 12.3 C, -1.1 C from the station mean1959: 14.2 C, +0.7 C from the station mean1960: 12.7 C, -0.7 C from the station mean1961: 13.0 C, -0.4 C from the station mean1962: 12.4 C, -1.0 C from the station mean1963: 12.9 C, -0.6 C from the station mean1964: 13.5 C, 0.0 C from the station mean1965: 13.5 C, 0.0 C from the station mean1966: 12.7 C, -0.8 C from the station mean1967: 12.7 C, -0.7 C from the station mean1969: 12.6 C, -0.8 C from the station mean1970: 13.6 C, +0.1 C from the station mean1971: 13.8 C, +0.4 C from the station mean1972: 13.0 C, -0.4 C from the station mean1973: 14.1 C, +0.6 C from the station mean1974: 13.9 C, +0.4 C from the station mean1975: 13.7 C, +0.3 C from the station mean1976: 13.3 C, -0.1 C from the station mean1977: 13.6 C, +0.2 C from the station mean1978: 12.7 C, -0.7 C from the station mean1979: 13.0 C, -0.5 C from the station mean1980: 13.4 C, -0.1 C from the station mean1981: 13.0 C, -0.4 C from the station mean1982: 13.3 C, -0.2 C from the station mean1983: 13.2 C, -0.2 C from the station mean1984: 13.4 C, -0.1 C from the station mean1985: 13.7 C, +0.2 C from the station mean1986: 13.4 C, 0.0 C from the station mean1987: 13.1 C, -0.3 C from the station mean1988: 12.7 C, -0.7 C from the station mean1989: 13.1 C, -0.3 C from the station mean1990: 15.0 C, +1.6 C from the station mean1991: 14.5 C, +1.1 C from the station mean1992: 12.8 C, -0.6 C from the station mean1993: 13.0 C, -0.5 C from the station mean1994: 13.2 C, -0.3 C from the station mean1995: 13.1 C, -0.4 C from the station mean1996: 12.4 C, -1.0 C from the station mean1997: 12.3 C, -1.1 C from the station mean1998: 13.8 C, +0.3 C from the station mean1999: 12.9 C, -0.5 C from the station mean2000: 12.0 C, -1.4 C from the station mean2001: 12.7 C, -0.8 C from the station mean2002: 13.9 C, +0.5 C from the station mean2003: 12.9 C, -0.6 C from the station mean2004: 13.5 C, 0.0 C from the station mean2005: 13.4 C, 0.0 C from the station mean2006: 13.8 C, +0.3 C from the station mean2007: 13.9 C, +0.4 C from the station mean2008: 13.4 C, -0.1 C from the station mean2009: 13.4 C, -0.1 C from the station mean2010: 14.2 C, +0.7 C from the station mean2011: 14.7 C, +1.2 C from the station mean2012: 14.8 C, +1.3 C from the station mean2013: 13.5 C, 0.0 C from the station mean2014: 13.0 C, -0.5 C from the station mean2015: 13.7 C, +0.2 C from the station mean2016: 14.2 C, +0.7 C from the station mean2017: 14.3 C, +0.9 C from the station mean2018: 14.0 C, +0.5 C from the station mean2019: 13.9 C, +0.4 C from the station mean2020: 14.2 C, +0.7 C from the station mean2021: 13.9 C, +0.5 C from the station mean2022: 13.4 C, -0.1 C from the station mean2023: 14.2 C, +0.8 C from the station mean2024: 14.9 C, +1.5 C from the station mean2025: 14.4 C, +0.9 C from the station mean19181930194019501960197019801990200020102020
One stripe for each of 99 complete years at Louisa, 1918 to 2025. Blue stripes are years cooler than the station's own mean of 13.4 C (56.2 F); red stripes are warmer. The coolest year was 1924, at 11.4 C (52.5 F), and the warmest was 1990, at 15.0 C (59.0 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Louisa as warming stripes, 1918 to 2025
YearAnnual mean temperatureDifference from the station mean
191812.4 C-1.08 C
192114.0 C+0.57 C
192312.5 C-0.99 C
192411.4 C-2.05 C
192513.0 C-0.43 C
192611.6 C-1.89 C
192712.8 C-0.61 C
192912.5 C-0.92 C
193013.4 C-0.01 C
193114.1 C+0.66 C
193213.9 C+0.49 C
193313.8 C+0.39 C
193613.1 C-0.35 C
193713.0 C-0.41 C
193813.9 C+0.48 C
193913.5 C+0.04 C
194213.2 C-0.25 C
194313.9 C+0.50 C
194413.7 C+0.23 C
194513.9 C+0.49 C
194614.1 C+0.62 C
194713.2 C-0.26 C
194813.3 C-0.10 C
194914.5 C+1.09 C
195013.6 C+0.20 C
195113.9 C+0.42 C
195214.0 C+0.59 C
195314.7 C+1.27 C
195414.0 C+0.59 C
195513.5 C+0.08 C
195613.8 C+0.35 C
195713.9 C+0.41 C
195812.3 C-1.11 C
195914.2 C+0.72 C
196012.7 C-0.72 C
196113.0 C-0.43 C
196212.4 C-1.00 C
196312.9 C-0.58 C
196413.5 C+0.04 C
196513.5 C+0.01 C
196612.7 C-0.77 C
196712.7 C-0.70 C
196912.6 C-0.80 C
197013.6 C+0.14 C
197113.8 C+0.36 C
197213.0 C-0.41 C
197314.1 C+0.62 C
197413.9 C+0.45 C
197513.7 C+0.27 C
197613.3 C-0.14 C
197713.6 C+0.20 C
197812.7 C-0.70 C
197913.0 C-0.49 C
198013.4 C-0.06 C
198113.0 C-0.42 C
198213.3 C-0.16 C
198313.2 C-0.21 C
198413.4 C-0.09 C
198513.7 C+0.21 C
198613.4 C0.00 C
198713.1 C-0.30 C
198812.7 C-0.72 C
198913.1 C-0.30 C
199015.0 C+1.58 C
199114.5 C+1.09 C
199212.8 C-0.60 C
199313.0 C-0.49 C
199413.2 C-0.28 C
199513.1 C-0.39 C
199612.4 C-1.03 C
199712.3 C-1.13 C
199813.8 C+0.32 C
199912.9 C-0.50 C
200012.0 C-1.43 C
200112.7 C-0.75 C
200213.9 C+0.49 C
200312.9 C-0.59 C
200413.5 C+0.01 C
200513.4 C-0.04 C
200613.8 C+0.34 C
200713.9 C+0.45 C
200813.4 C-0.05 C
200913.4 C-0.06 C
201014.2 C+0.72 C
201114.7 C+1.24 C
201214.8 C+1.34 C
201313.5 C+0.05 C
201413.0 C-0.47 C
201513.7 C+0.24 C
201614.2 C+0.73 C
201714.3 C+0.89 C
201814.0 C+0.55 C
201913.9 C+0.44 C
202014.2 C+0.74 C
202113.9 C+0.50 C
202213.4 C-0.08 C
202314.2 C+0.77 C
202414.9 C+1.48 C
202514.4 C+0.95 C

The annual mean temperature here has risen by 0.06 C (0.02 to 0.11) per decade over 1918 to 2025. In Fahrenheit: 0.11 F (0.03 to 0.19) per decade. The slope is a straight line fitted to 99 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Louisa
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.06 C (0.02 to 0.11) per decade0.11 F (0.03 to 0.19) per decade1918 to 202599Rise
Mean daily maximum0.07 C (0.02 to 0.12) per decade0.13 F (0.03 to 0.22) per decade1918 to 202599Rise
Mean daily minimum0.1 C (0.0 to 0.1) per decade0.1 F (0.0 to 0.2) per decade1918 to 202599Not 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

1916 to 2026
Yearly extremes at Louisa: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.2 C (108.0 F)193036.7 C (98.1 F)111
Coldest night (TNn)-29.4 C (-20.9 F)1996-16.7 C (1.9 F)111
Wettest day (Rx1day)284.0 mm (11.2 in)196966.8 mm (2.6 in)111
Wettest five days (Rx5day)288.3 mm (11.4 in)1969102.4 mm (4.0 in)111
Longest dry spell (CDD)43 days200020 days111

Hottest day (TXx)

Hottest day (TXx) at Louisa by year The hottest day of the year at Louisa, 1916 to 2026. The record is 42.2 C (108.0 F) in 1930, marked on the chart; the median year is 36.7 C (98.1 F). 32.53537.54042.5192019401960198020002020Record: 42.2 C (108.0 F) in 1930
The hottest day of the year at Louisa, 1916 to 2026. The record is 42.2 C (108.0 F) in 1930, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Louisa by year
YearHottest day (TXx)
191633.9 C (93.0 F)
191735.6 C (96.1 F)
191840.0 C (104.0 F)
191935.6 C (96.1 F)
192033.9 C (93.0 F)
192136.1 C (97.0 F)
192235.0 C (95.0 F)
192335.0 C (95.0 F)
192437.2 C (99.0 F)
192537.2 C (99.0 F)
192639.4 C (102.9 F)
192736.7 C (98.1 F)
192835.6 C (96.1 F)
192936.1 C (97.0 F)
193042.2 C (108.0 F)
193138.3 C (100.9 F)
193240.0 C (104.0 F)
193337.2 C (99.0 F)
193436.7 C (98.1 F)
193536.1 C (97.0 F)
193638.3 C (100.9 F)
193735.6 C (96.1 F)
193836.1 C (97.0 F)
193937.8 C (100.0 F)
194036.1 C (97.0 F)
194137.2 C (99.0 F)
194238.9 C (102.0 F)
194337.2 C (99.0 F)
194438.3 C (100.9 F)
194538.3 C (100.9 F)
194635.6 C (96.1 F)
194736.7 C (98.1 F)
194837.2 C (99.0 F)
194936.7 C (98.1 F)
195037.8 C (100.0 F)
195137.2 C (99.0 F)
195238.9 C (102.0 F)
195340.0 C (104.0 F)
195440.0 C (104.0 F)
195536.7 C (98.1 F)
195637.2 C (99.0 F)
195737.8 C (100.0 F)
195835.0 C (95.0 F)
195937.2 C (99.0 F)
196037.8 C (100.0 F)
196134.4 C (93.9 F)
196234.4 C (93.9 F)
196336.7 C (98.1 F)
196437.2 C (99.0 F)
196536.7 C (98.1 F)
196636.7 C (98.1 F)
196733.9 C (93.0 F)
196836.7 C (98.1 F)
196935.0 C (95.0 F)
197036.7 C (98.1 F)
197135.0 C (95.0 F)
197235.0 C (95.0 F)
197335.0 C (95.0 F)
197433.9 C (93.0 F)
197534.4 C (93.9 F)
197635.6 C (96.1 F)
197738.3 C (100.9 F)
197834.4 C (93.9 F)
197935.0 C (95.0 F)
198037.2 C (99.0 F)
198134.4 C (93.9 F)
198232.8 C (91.0 F)
198338.9 C (102.0 F)
198435.0 C (95.0 F)
198535.0 C (95.0 F)
198635.6 C (96.1 F)
198737.2 C (99.0 F)
198837.8 C (100.0 F)
198935.6 C (96.1 F)
199036.7 C (98.1 F)
199135.6 C (96.1 F)
199235.6 C (96.1 F)
199336.7 C (98.1 F)
199435.6 C (96.1 F)
199536.7 C (98.1 F)
199635.6 C (96.1 F)
199736.1 C (97.0 F)
199837.2 C (99.0 F)
199938.9 C (102.0 F)
200033.9 C (93.0 F)
200136.1 C (97.0 F)
200238.3 C (100.9 F)
200334.4 C (93.9 F)
200432.8 C (91.0 F)
200536.7 C (98.1 F)
200637.2 C (99.0 F)
200737.8 C (100.0 F)
200836.1 C (97.0 F)
200935.6 C (96.1 F)
201038.3 C (100.9 F)
201137.8 C (100.0 F)
201238.3 C (100.9 F)
201335.0 C (95.0 F)
201435.0 C (95.0 F)
201533.3 C (91.9 F)
201635.0 C (95.0 F)
201735.6 C (96.1 F)
201835.0 C (95.0 F)
201935.6 C (96.1 F)
202036.1 C (97.0 F)
202134.4 C (93.9 F)
202234.4 C (93.9 F)
202334.4 C (93.9 F)
202436.7 C (98.1 F)
202536.7 C (98.1 F)
202638.9 C (102.0 F)

Coldest night (TNn)

Coldest night (TNn) at Louisa by year The coldest night of the year at Louisa, 1916 to 2026. The record is -29.4 C (-20.9 F) in 1996, marked on the chart; the median year is -16.7 C (1.9 F). -30-25-20-15-10192019401960198020002020Record: -29.4 C (-20.9 F) in 1996
The coldest night of the year at Louisa, 1916 to 2026. The record is -29.4 C (-20.9 F) in 1996, marked on the chart; the median year is -16.7 C (1.9 F).
Coldest night (TNn) at Louisa by year
YearColdest night (TNn)
1916-16.1 C (3.0 F)
1917-22.8 C (-9.0 F)
1918-27.8 C (-18.0 F)
1919-21.7 C (-7.1 F)
1920-16.7 C (1.9 F)
1921-13.3 C (8.1 F)
1922-16.7 C (1.9 F)
1923-15.6 C (3.9 F)
1924-17.8 C (0.0 F)
1925-16.7 C (1.9 F)
1926-17.8 C (0.0 F)
1927-16.1 C (3.0 F)
1928-22.8 C (-9.0 F)
1929-15.6 C (3.9 F)
1930-22.2 C (-8.0 F)
1931-13.9 C (7.0 F)
1932-16.1 C (3.0 F)
1933-13.3 C (8.1 F)
1934-24.4 C (-11.9 F)
1935-22.2 C (-8.0 F)
1936-25.6 C (-14.1 F)
1937-14.4 C (6.1 F)
1938-14.4 C (6.1 F)
1939-12.2 C (10.0 F)
1940-28.9 C (-20.0 F)
1941-11.7 C (10.9 F)
1942-21.7 C (-7.1 F)
1943-16.1 C (3.0 F)
1944-13.3 C (8.1 F)
1945-16.1 C (3.0 F)
1946-15.6 C (3.9 F)
1947-15.6 C (3.9 F)
1948-21.1 C (-6.0 F)
1949-11.7 C (10.9 F)
1950-12.8 C (9.0 F)
1951-16.1 C (3.0 F)
1952-12.2 C (10.0 F)
1953-12.2 C (10.0 F)
1954-13.9 C (7.0 F)
1955-15.6 C (3.9 F)
1956-11.1 C (12.0 F)
1957-20.6 C (-5.1 F)
1958-15.6 C (3.9 F)
1959-19.4 C (-2.9 F)
1960-16.7 C (1.9 F)
1961-20.0 C (-4.0 F)
1962-22.8 C (-9.0 F)
1963-17.2 C (1.0 F)
1964-20.0 C (-4.0 F)
1965-20.0 C (-4.0 F)
1966-17.8 C (0.0 F)
1967-18.3 C (-0.9 F)
1968-16.7 C (1.9 F)
1969-16.7 C (1.9 F)
1970-17.8 C (0.0 F)
1971-15.6 C (3.9 F)
1972-18.3 C (-0.9 F)
1973-15.0 C (5.0 F)
1974-12.2 C (10.0 F)
1975-13.3 C (8.1 F)
1976-16.1 C (3.0 F)
1977-19.4 C (-2.9 F)
1978-14.4 C (6.1 F)
1979-22.2 C (-8.0 F)
1980-17.2 C (1.0 F)
1981-17.8 C (0.0 F)
1982-18.3 C (-0.9 F)
1983-18.3 C (-0.9 F)
1984-23.9 C (-11.0 F)
1985-21.7 C (-7.1 F)
1986-15.6 C (3.9 F)
1987-25.0 C (-13.0 F)
1988-21.1 C (-6.0 F)
1989-22.8 C (-9.0 F)
1990-14.4 C (6.1 F)
1991-13.3 C (8.1 F)
1992-12.8 C (9.0 F)
1993-18.3 C (-0.9 F)
1994-20.0 C (-4.0 F)
1995-17.2 C (1.0 F)
1996-29.4 C (-20.9 F)
1997-18.9 C (-2.0 F)
1998-14.4 C (6.1 F)
1999-16.1 C (3.0 F)
2000-25.6 C (-14.1 F)
2001-16.7 C (1.9 F)
2002-14.4 C (6.1 F)
2003-16.7 C (1.9 F)
2004-16.7 C (1.9 F)
2005-15.6 C (3.9 F)
2006-13.3 C (8.1 F)
2007-15.0 C (5.0 F)
2008-14.4 C (6.1 F)
2009-19.4 C (-2.9 F)
2010-19.4 C (-2.9 F)
2011-13.3 C (8.1 F)
2012-11.1 C (12.0 F)
2013-15.0 C (5.0 F)
2014-20.6 C (-5.1 F)
2015-20.6 C (-5.1 F)
2016-15.6 C (3.9 F)
2017-21.1 C (-6.0 F)
2018-21.7 C (-7.1 F)
2019-15.0 C (5.0 F)
2020-10.0 C (14.0 F)
2021-12.2 C (10.0 F)
2022-15.6 C (3.9 F)
2023-12.2 C (10.0 F)
2024-14.4 C (6.1 F)
2025-15.6 C (3.9 F)
2026-16.7 C (1.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Louisa by year The wettest day of the year at Louisa, 1916 to 2026. The record is 284.0 mm (11.2 in) in 1969, marked on the chart; the median year is 66.8 mm (2.6 in). 0100200300192019401960198020002020Record: 284.0 mm (11.2 in) in 1969
The wettest day of the year at Louisa, 1916 to 2026. The record is 284.0 mm (11.2 in) in 1969, marked on the chart; the median year is 66.8 mm (2.6 in).
Wettest day (Rx1day) at Louisa by year
YearWettest day (Rx1day)
191670.9 mm (2.8 in)
191758.4 mm (2.3 in)
191845.5 mm (1.8 in)
191948.8 mm (1.9 in)
192066.8 mm (2.6 in)
192143.2 mm (1.7 in)
192246.0 mm (1.8 in)
192358.4 mm (2.3 in)
192476.2 mm (3.0 in)
192575.4 mm (3.0 in)
192699.1 mm (3.9 in)
192763.5 mm (2.5 in)
1928108.0 mm (4.3 in)
1929143.0 mm (5.6 in)
193048.3 mm (1.9 in)
193143.2 mm (1.7 in)
193278.7 mm (3.1 in)
193344.5 mm (1.8 in)
1934107.2 mm (4.2 in)
193563.8 mm (2.5 in)
193659.7 mm (2.4 in)
193797.3 mm (3.8 in)
193841.4 mm (1.6 in)
193952.1 mm (2.1 in)
194063.5 mm (2.5 in)
194148.8 mm (1.9 in)
194263.5 mm (2.5 in)
1943116.8 mm (4.6 in)
194467.3 mm (2.6 in)
194556.4 mm (2.2 in)
194653.8 mm (2.1 in)
194764.3 mm (2.5 in)
1948112.8 mm (4.4 in)
194987.1 mm (3.4 in)
195054.6 mm (2.1 in)
195150.8 mm (2.0 in)
195270.6 mm (2.8 in)
195357.4 mm (2.3 in)
195474.4 mm (2.9 in)
195580.0 mm (3.1 in)
1956131.6 mm (5.2 in)
195790.2 mm (3.6 in)
195865.5 mm (2.6 in)
195967.3 mm (2.6 in)
196046.5 mm (1.8 in)
196194.0 mm (3.7 in)
196238.9 mm (1.5 in)
196356.9 mm (2.2 in)
196448.5 mm (1.9 in)
196543.2 mm (1.7 in)
196677.2 mm (3.0 in)
196754.4 mm (2.1 in)
196883.8 mm (3.3 in)
1969284.0 mm (11.2 in)
197039.4 mm (1.6 in)
197158.4 mm (2.3 in)
1972124.2 mm (4.9 in)
197373.7 mm (2.9 in)
197446.2 mm (1.8 in)
1975165.4 mm (6.5 in)
197668.3 mm (2.7 in)
197757.9 mm (2.3 in)
197886.4 mm (3.4 in)
197969.3 mm (2.7 in)
198051.1 mm (2.0 in)
198152.3 mm (2.1 in)
198247.8 mm (1.9 in)
198391.4 mm (3.6 in)
1984101.1 mm (4.0 in)
1985149.4 mm (5.9 in)
198653.1 mm (2.1 in)
198785.3 mm (3.4 in)
198842.4 mm (1.7 in)
198990.9 mm (3.6 in)
199057.7 mm (2.3 in)
199188.1 mm (3.5 in)
199280.8 mm (3.2 in)
1993146.3 mm (5.8 in)
1994138.2 mm (5.4 in)
199588.9 mm (3.5 in)
1996116.6 mm (4.6 in)
199775.4 mm (3.0 in)
199872.9 mm (2.9 in)
199946.5 mm (1.8 in)
200046.7 mm (1.8 in)
200152.8 mm (2.1 in)
200294.2 mm (3.7 in)
2003100.1 mm (3.9 in)
200466.0 mm (2.6 in)
200577.0 mm (3.0 in)
200689.2 mm (3.5 in)
200766.8 mm (2.6 in)
200872.4 mm (2.9 in)
200958.4 mm (2.3 in)
201057.7 mm (2.3 in)
201177.5 mm (3.1 in)
201240.9 mm (1.6 in)
201387.4 mm (3.4 in)
201456.9 mm (2.2 in)
201567.3 mm (2.6 in)
201655.9 mm (2.2 in)
201735.8 mm (1.4 in)
201891.7 mm (3.6 in)
201955.1 mm (2.2 in)
202098.0 mm (3.9 in)
202175.7 mm (3.0 in)
202265.5 mm (2.6 in)
202371.4 mm (2.8 in)
2024106.9 mm (4.2 in)
202561.2 mm (2.4 in)
202655.6 mm (2.2 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Louisa by year The wettest five days of the year at Louisa, 1916 to 2026. The record is 288.3 mm (11.4 in) in 1969, marked on the chart; the median year is 102.4 mm (4.0 in). 0100200300192019401960198020002020Record: 288.3 mm (11.4 in) in 1969
The wettest five days of the year at Louisa, 1916 to 2026. The record is 288.3 mm (11.4 in) in 1969, marked on the chart; the median year is 102.4 mm (4.0 in).
Wettest five days (Rx5day) at Louisa by year
YearWettest five days (Rx5day)
1916134.4 mm (5.3 in)
191773.4 mm (2.9 in)
191883.6 mm (3.3 in)
1919100.3 mm (3.9 in)
192095.5 mm (3.8 in)
192185.1 mm (3.4 in)
192290.6 mm (3.6 in)
192395.8 mm (3.8 in)
1924128.5 mm (5.1 in)
192579.7 mm (3.1 in)
1926116.6 mm (4.6 in)
192765.4 mm (2.6 in)
1928112.0 mm (4.4 in)
1929143.0 mm (5.6 in)
193055.9 mm (2.2 in)
193175.0 mm (3.0 in)
1932102.9 mm (4.1 in)
193377.9 mm (3.1 in)
1934113.3 mm (4.5 in)
193582.4 mm (3.2 in)
193695.9 mm (3.8 in)
1937206.3 mm (8.1 in)
193883.1 mm (3.3 in)
193972.4 mm (2.9 in)
194085.1 mm (3.4 in)
1941116.8 mm (4.6 in)
1942135.1 mm (5.3 in)
1943129.2 mm (5.1 in)
194488.9 mm (3.5 in)
1945148.6 mm (5.9 in)
194662.0 mm (2.4 in)
194771.6 mm (2.8 in)
1948227.9 mm (9.0 in)
1949120.4 mm (4.7 in)
1950148.4 mm (5.8 in)
195194.2 mm (3.7 in)
1952122.0 mm (4.8 in)
195387.1 mm (3.4 in)
195475.7 mm (3.0 in)
1955165.2 mm (6.5 in)
1956184.9 mm (7.3 in)
195790.7 mm (3.6 in)
195886.1 mm (3.4 in)
1959102.4 mm (4.0 in)
196093.0 mm (3.7 in)
1961180.6 mm (7.1 in)
196271.3 mm (2.8 in)
196385.8 mm (3.4 in)
196460.7 mm (2.4 in)
196568.3 mm (2.7 in)
196698.7 mm (3.9 in)
1967129.1 mm (5.1 in)
1968118.4 mm (4.7 in)
1969288.3 mm (11.4 in)
197082.6 mm (3.3 in)
1971120.0 mm (4.7 in)
1972233.9 mm (9.2 in)
197382.4 mm (3.2 in)
1974110.5 mm (4.4 in)
1975180.6 mm (7.1 in)
197678.9 mm (3.1 in)
197781.9 mm (3.2 in)
1978134.7 mm (5.3 in)
1979112.2 mm (4.4 in)
198065.3 mm (2.6 in)
198198.0 mm (3.9 in)
198266.5 mm (2.6 in)
1983106.2 mm (4.2 in)
1984126.4 mm (5.0 in)
1985204.3 mm (8.0 in)
198681.8 mm (3.2 in)
1987159.2 mm (6.3 in)
198863.0 mm (2.5 in)
1989103.9 mm (4.1 in)
1990131.9 mm (5.2 in)
1991124.9 mm (4.9 in)
1992105.7 mm (4.2 in)
1993211.1 mm (8.3 in)
1994202.8 mm (8.0 in)
199588.9 mm (3.5 in)
1996180.4 mm (7.1 in)
199791.9 mm (3.6 in)
1998106.0 mm (4.2 in)
199989.9 mm (3.5 in)
200060.0 mm (2.4 in)
200182.4 mm (3.2 in)
2002117.8 mm (4.6 in)
2003141.5 mm (5.6 in)
2004106.2 mm (4.2 in)
2005140.6 mm (5.5 in)
2006178.3 mm (7.0 in)
2007140.4 mm (5.5 in)
2008103.7 mm (4.1 in)
2009102.4 mm (4.0 in)
2010127.5 mm (5.0 in)
2011110.8 mm (4.4 in)
201267.6 mm (2.7 in)
2013118.9 mm (4.7 in)
201488.1 mm (3.5 in)
2015150.1 mm (5.9 in)
201658.9 mm (2.3 in)
201757.1 mm (2.2 in)
2018130.0 mm (5.1 in)
201983.0 mm (3.3 in)
2020151.8 mm (6.0 in)
2021102.0 mm (4.0 in)
202297.5 mm (3.8 in)
2023101.2 mm (4.0 in)
2024116.3 mm (4.6 in)
202565.8 mm (2.6 in)
202668.5 mm (2.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Louisa by year The longest dry spell of the year at Louisa, 1916 to 2026. The record is 43 days in 2000, marked on the chart; the median year is 20 days. 1020304050192019401960198020002020Record: 43 days in 2000
The longest dry spell of the year at Louisa, 1916 to 2026. The record is 43 days in 2000, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Louisa by year
YearLongest dry spell (CDD)
191623 days
191724 days
191828 days
191925 days
192027 days
192124 days
192224 days
192324 days
192417 days
192519 days
192615 days
192717 days
192814 days
192919 days
193025 days
193120 days
193215 days
193325 days
193413 days
193515 days
193623 days
193719 days
193820 days
193927 days
194014 days
194126 days
194221 days
194326 days
194423 days
194521 days
194620 days
194716 days
194810 days
194918 days
195014 days
195113 days
195222 days
195334 days
195425 days
195517 days
195619 days
195715 days
195823 days
195922 days
196018 days
196114 days
196215 days
196323 days
196432 days
196520 days
196621 days
196721 days
196826 days
196917 days
197025 days
197125 days
197210 days
197320 days
197419 days
197517 days
197626 days
197739 days
197821 days
197911 days
198018 days
198119 days
198218 days
198313 days
198420 days
198525 days
198619 days
198721 days
198816 days
198917 days
199018 days
199123 days
199215 days
199321 days
199426 days
199524 days
199612 days
199713 days
199829 days
199919 days
200043 days
200137 days
200219 days
200315 days
200427 days
200517 days
200639 days
200733 days
200816 days
200917 days
201016 days
201115 days
201221 days
201316 days
201414 days
201516 days
201614 days
201725 days
201821 days
201917 days
202017 days
202128 days
202216 days
202336 days
202437 days
202513 days
202620 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

99 years with a frost

Across 99 years with a frost, the median last spring frost at Louisa falls on 26 April and the median first autumn frost on 15 October, which leaves a median of 172 days between them.

In 1996 to 2025 the median growing season was 174 days. That is 7 days more than in 1918 to 1955.

Fitted over all years, the growing season changes by +0.7 days per decade at this station.

Frost dates and growing season at Louisa
MeasureMedian, all yearsEarliest period (1918 to 1955)Recent period (1996 to 2025)Recent against earliestFitted trend
Last spring frost26 April28 April27 April1 day earlier-0.2 days per decade
First autumn frost15 October12 October18 October6 days later+0.5 days per decade
Growing days172 days167 days174 days7 days more+0.7 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

102 years, 1917 to 2025

A day with at least 67.5 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 202.4 mm (8.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Louisa: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years67.5 mm (2.7 in)
5 years93.4 mm (3.7 in)
10 years114.0 mm (4.5 in)
25 years144.8 mm (5.7 in)
50 years171.7 mm (6.8 in)
100 years202.4 mm (8.0 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 102 years of values from 1917 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: 284.0 mm (11.2 in) in 1969; 165.4 mm (6.5 in) in 1975; 149.4 mm (5.9 in) in 1985.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Louisa, at 1943. Each is measured against neighbouring stations.

  • Relative to 5 neighbouring stations, the station's annual mean temperature from 1943 ran 0.3 C (0.6 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Louisa, against neighbouring stations
YearShift (C)Shift (F)StrengthNeighbours
1943+0.3+0.6likely5

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.

Climate Twins

2011 to 2025 against 1961 to 1990

Over 2011 to 2025, Louisa had a mean temperature of 14.1 C (57.3 F) and 1,081.4 mm (42.6 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Greensboro AP (United States, 276 km away), Kingsport (United States, 434 km away) and Statesville 2 NNE (United States, 356 km away).

Climate twins of Louisa: 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
Greensboro APUnited States276 km (171 mi)14.3 C (57.8 F)1,083.0 mm (42.6 in)0.59
KingsportUnited States434 km (270 mi)14.1 C (57.3 F)1,115.1 mm (43.9 in)0.59
Statesville 2 NNEUnited States356 km (221 mi)14.2 C (57.5 F)1,164.5 mm (45.8 in)0.62

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 Louisa standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Louisa 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-13).