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Built 2026-10-18 (18 October 2026)

Jefferson Threshold Days by Year

19 fixed thresholds counted per year at Jefferson (USC00414577): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Jefferson Thresholds

  • Jefferson: days with 10 mm (0.39 in) or more of precipitation in 101 years, most in 1905 with 55.
  • Jefferson: days with 25 mm (0.98 in) or more of precipitation in 101 years, most in 1905 with 33.
  • Jefferson: days with 50 mm (1.97 in) or more of precipitation in 100 years, most in 1905 with 11.
  • Jefferson: days with 100 mm (3.94 in) or more of precipitation in 39 years, most in 1926 with 3.
  • 19 fixed thresholds have at least one qualifying day at Jefferson.
33 years with a qualifying day
Days at or above 30 C (86 F) per year at Jefferson Days per year at Jefferson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 159 in 2010. 0501001502001904: 1121905: 1001906: 1081984: 1221985: 1241987: 1311988: 1221989: 1161990: 1191992: 1041993: 1251994: 1111995: 1051996: 1121997: 1101998: 1361999: 1242000: 1232008: 962009: 1132010: 1592011: 1542016: 1342017: 1162018: 1422019: 1302020: 1142021: 1172022: 1332023: 1372024: 1282025: 1342026: 138190419851990199519992010201820222026
Days per year at Jefferson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 159 in 2010.
Days at or above 30 C (86 F) per year at Jefferson
YearDaysDecade average
1904112106.7
1905100106.7
1906108106.7
1984122123
1985124123
1987131123
1988122123
1989116123
1990119116.2
1992104116.2
1993125116.2
1994111116.2
1995105116.2
1996112116.2
1997110116.2
1998136116.2
1999124116.2
2000123110.7
200896110.7
2009113110.7
2010159139.2
2011154139.2
2016134139.2
2017116139.2
2018142139.2
2019130139.2
2020114128.7
2021117128.7
2022133128.7
2023137128.7
2024128128.7
2025134128.7
2026138128.7
First to last qualifying date each year at Jefferson For each year, a bar from the first to the last day at Jefferson meeting 30 C (86 F). 1904: 22 May 1904 to 11 October 19041905: 28 April 1905 to 1 October 19051906: 4 May 1906 to 23 September 19061984: 21 April 1984 to 19 October 19841985: 16 April 1985 to 25 October 19851987: 12 April 1987 to 4 October 19871988: 5 April 1988 to 28 December 19881989: 3 April 1989 to 7 November 19891990: 24 April 1990 to 17 October 19901992: 8 March 1992 to 1 November 19921993: 5 May 1993 to 8 October 19931994: 11 April 1994 to 8 October 19941995: 23 March 1995 to 17 October 19951996: 22 February 1996 to 28 October 19961997: 22 April 1997 to 10 October 19971998: 8 May 1998 to 17 October 19981999: 10 April 1999 to 23 October 19992000: 8 May 2000 to 6 October 20002008: 18 May 2008 to 24 September 20082009: 23 April 2009 to 16 October 20092010: 6 April 2010 to 28 October 20102011: 20 March 2011 to 18 October 20112016: 15 March 2016 to 17 November 20162017: 21 March 2017 to 7 November 20172018: 7 May 2018 to 9 October 20182019: 11 April 2019 to 21 October 20192020: 25 March 2020 to 22 October 20202021: 13 April 2021 to 26 October 20212022: 6 April 2022 to 5 November 20222023: 22 February 2023 to 28 October 20232024: 27 February 2024 to 30 October 20242025: 9 February 2025 to 20 October 20252026: 27 February 2026 to 15 October 20261904198719931998201020192024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Jefferson meeting 30 C (86 F).
First to last qualifying date each year at Jefferson
YearFirst dateLast date
19041904-05-221904-10-11
19051905-04-281905-10-01
19061906-05-041906-09-23
19841984-04-211984-10-19
19851985-04-161985-10-25
19871987-04-121987-10-04
19881988-04-051988-12-28
19891989-04-031989-11-07
19901990-04-241990-10-17
19921992-03-081992-11-01
19931993-05-051993-10-08
19941994-04-111994-10-08
19951995-03-231995-10-17
19961996-02-221996-10-28
19971997-04-221997-10-10
19981998-05-081998-10-17
19991999-04-101999-10-23
20002000-05-082000-10-06
20082008-05-182008-09-24
20092009-04-232009-10-16
20102010-04-062010-10-28
20112011-03-202011-10-18
20162016-03-152016-11-17
20172017-03-212017-11-07
20182018-05-072018-10-09
20192019-04-112019-10-21
20202020-03-252020-10-22
20212021-04-132021-10-26
20222022-04-062022-11-05
20232023-02-222023-10-28
20242024-02-272024-10-30
20252025-02-092025-10-20
20262026-02-272026-10-15

Every Fixed Threshold

Fixed thresholds at Jefferson
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days331592010138
35 C (95 F): Days31104201163
40 C (104 F): Days124320115
90 F (32.2 C): Days331322010108
100 F (37.8 C): Days2279201121
110 F (43.3 C): Days1720117
0 C (32 F): Ice days (max18919893
0 C (32 F): Frost days (min3374201029
-10 C (14 F): Days with min18819962
-20 C (-4 F): Days with min2119891
20 C (68 F): Tropical nights (min331211905116
25 C (77 F): Days with min234420116
10 mm (0.39 in): Days with 10 mm or more rain10155190525
25 mm (0.98 in): Days with 25 mm or more rain1013319058
50 mm (1.97 in): Days with 50 mm or more rain1001119052
100 mm (3.94 in): Days with 100 mm or more rain39319261
200 mm (7.87 in): Days with 200 mm or more rain2119211
10 cm (3.9 in): Days with 10 cm or more snowfall8219291
25 cm (9.8 in): Days with 25 cm or more snowfall2119291

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.

Download the Data

  • Data for Jefferson 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). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-17).