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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Jefferson Threshold Days by Year (USC00274329)

14 fixed thresholds counted per year at Jefferson (USC00274329): 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 48 years, most in 2008 with 42.
  • Jefferson: days with 25 mm (0.98 in) or more of precipitation in 48 years, most in 1990 with 12.
  • Jefferson: days with 10 cm (3.9 in) or more of snowfall in 44 years, most in 1966 with 12.
  • Jefferson: days with 25 cm (9.8 in) or more of snowfall in 24 years, most in 1987 with 3.
  • 14 fixed thresholds have at least one qualifying day at Jefferson.
16 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 19 in 2020. 051015202011: 82012: 72013: 72014: 32015: 32016: 102017: 82018: 162019: 42020: 192021: 122022: 112023: 22024: 62025: 152026: 320112013201520172019202120232025
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 19 in 2020.
Days at or above 30 C (86 F) per year at Jefferson
YearDaysDecade average
201187.3
201277.3
201377.3
201437.3
201537.3
2016107.3
201787.3
2018167.3
201947.3
2020199.7
2021129.7
2022119.7
202329.7
202469.7
2025159.7
202639.7
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). 2011: 9 June 2011 to 5 September 20112012: 21 May 2012 to 5 August 20122013: 2 June 2013 to 12 September 20132014: 2 July 2014 to 4 July 20142015: 28 May 2015 to 10 September 20152016: 29 May 2016 to 12 August 20162017: 19 May 2017 to 28 September 20172018: 1 June 2018 to 4 September 20182019: 6 July 2019 to 31 July 20192020: 27 May 2020 to 10 September 20202021: 22 May 2021 to 27 August 20212022: 15 May 2022 to 9 August 20222023: 2 June 2023 to 7 July 20232024: 19 June 2024 to 3 August 20242025: 6 June 2025 to 14 August 20252026: 13 June 2026 to 3 July 202620112013201520172019202120232025JanFebMarAprMayJunJulAugSepOctNovDec
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
20112011-06-092011-09-05
20122012-05-212012-08-05
20132013-06-022013-09-12
20142014-07-022014-07-04
20152015-05-282015-09-10
20162016-05-292016-08-12
20172017-05-192017-09-28
20182018-06-012018-09-04
20192019-07-062019-07-31
20202020-05-272020-09-10
20212021-05-222021-08-27
20222022-05-152022-08-09
20232023-06-022023-07-07
20242024-06-192024-08-03
20252025-06-062025-08-14
20262026-06-132026-07-03

Every Fixed Threshold

Fixed thresholds at Jefferson
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days161920203
90 F (32.2 C): Days8720205
0 C (32 F): Ice days (max1698201953
0 C (32 F): Frost days (min161862020115
-10 C (14 F): Days with min1686201959
-20 C (-4 F): Days with min1635201518
-30 C (-22 F): Days with min2220232
20 C (68 F): Tropical nights (min11720181
10 mm (0.39 in): Days with 10 mm or more rain4842200825
25 mm (0.98 in): Days with 25 mm or more rain481219908
50 mm (1.97 in): Days with 50 mm or more rain22320102
10 cm (3.9 in): Days with 10 cm or more snowfall441219666
25 cm (9.8 in): Days with 25 cm or more snowfall24319871
50 cm (19.7 in): Days with 50 cm or more snowfall1120031

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2011.

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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