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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Jefferson Threshold Days by Year (USC00354238)

5 fixed thresholds counted per year at Jefferson (USC00354238): 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 20 years, most in 1950 with 48.
  • Jefferson: days with 25 mm (0.98 in) or more of precipitation in 20 years, most in 1916 with 11.
  • Jefferson: days with 50 mm (1.97 in) or more of precipitation in 10 years, most in 1919 with 4.
  • Jefferson: days with 10 cm (3.9 in) or more of snowfall in 2 years, most in 1950 with 2.
  • 5 fixed thresholds have at least one qualifying day at Jefferson.
20 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Jefferson Days per year at Jefferson with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 48 in 1950. 02040601910: 401911: 251912: 471913: 331914: 401915: 321916: 371917: 361918: 301919: 461920: 451921: 381922: 401939: 231940: 371949: 271950: 481951: 441952: 221953: 461910191219141916191819201922194019501952
Days per year at Jefferson with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 48 in 1950.
Days with 10 mm (0.39 in) or more of precipitation per year at Jefferson
YearDaysDecade average
19104036.6
19112536.6
19124736.6
19133336.6
19144036.6
19153236.6
19163736.6
19173636.6
19183036.6
19194636.6
19204541
19213841
19224041
19392323
19403732
19492732
19504840
19514440
19522240
19534640
First to last qualifying date each year at Jefferson For each year, a bar from the first to the last day at Jefferson meeting 10 mm (0.39 in). 1910: 7 January 1910 to 30 December 19101911: 9 January 1911 to 31 December 19111912: 5 January 1912 to 31 December 19121913: 8 January 1913 to 30 December 19131914: 4 January 1914 to 26 December 19141915: 1 January 1915 to 28 December 19151916: 7 January 1916 to 9 December 19161917: 2 January 1917 to 30 December 19171918: 4 January 1918 to 19 December 19181919: 15 January 1919 to 25 December 19191920: 24 January 1920 to 30 December 19201921: 2 January 1921 to 2 December 19211922: 5 January 1922 to 31 December 19221939: 2 January 1939 to 20 December 19391940: 4 January 1940 to 27 December 19401949: 1 January 1949 to 31 December 19491950: 7 January 1950 to 16 December 19501951: 2 January 1951 to 29 December 19511952: 4 January 1952 to 30 December 19521953: 2 January 1953 to 21 December 19531910191319161919192219491952JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Jefferson meeting 10 mm (0.39 in).
First to last qualifying date each year at Jefferson
YearFirst dateLast date
19101910-01-071910-12-30
19111911-01-091911-12-31
19121912-01-051912-12-31
19131913-01-081913-12-30
19141914-01-041914-12-26
19151915-01-011915-12-28
19161916-01-071916-12-09
19171917-01-021917-12-30
19181918-01-041918-12-19
19191919-01-151919-12-25
19201920-01-241920-12-30
19211921-01-021921-12-02
19221922-01-051922-12-31
19391939-01-021939-12-20
19401940-01-041940-12-27
19491949-01-011949-12-31
19501950-01-071950-12-16
19511951-01-021951-12-29
19521952-01-041952-12-30
19531953-01-021953-12-21

Every Fixed Threshold

Fixed thresholds at Jefferson
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2048195046
25 mm (0.98 in): Days with 25 mm or more rain2011191611
50 mm (1.97 in): Days with 50 mm or more rain10419191
100 mm (3.94 in): Days with 100 mm or more rain1119111
10 cm (3.9 in): Days with 10 cm or more snowfall2219501

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1910.

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 (2025-12-31).