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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 (USC00193931)

8 fixed thresholds counted per year at Jefferson (USC00193931): 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 33 years, most in 1898 with 48.
  • Jefferson: days with 25 mm (0.98 in) or more of precipitation in 33 years, most in 1945 with 25.
  • Jefferson: days with 50 mm (1.97 in) or more of precipitation in 28 years, most in 1920 with 8.
  • Jefferson: days with 10 cm (3.9 in) or more of snowfall in 14 years, most in 1956 with 12.
  • 8 fixed thresholds have at least one qualifying day at Jefferson.
33 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 1898. 02040601898: 481912: 341913: 351914: 381915: 331916: 411918: 371920: 421921: 411922: 391923: 361924: 351927: 481930: 361931: 381932: 371933: 421936: 431937: 451938: 421939: 391940: 341941: 271942: 441943: 411944: 321945: 461946: 351947: 371948: 341949: 221950: 291957: 23189819151921192719331939194319471957
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 1898.
Days with 10 mm (0.39 in) or more of precipitation per year at Jefferson
YearDaysDecade average
18984848
19123436.3
19133536.3
19143836.3
19153336.3
19164136.3
19183736.3
19204240.2
19214140.2
19223940.2
19233640.2
19243540.2
19274840.2
19303640.3
19313840.3
19323740.3
19334240.3
19364340.3
19374540.3
19384240.3
19393940.3
19403435.2
19412735.2
19424435.2
19434135.2
19443235.2
19454635.2
19463535.2
19473735.2
19483435.2
19492235.2
19502926
19572326
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). 1898: 5 January 1898 to 31 December 18981912: 9 January 1912 to 30 December 19121913: 3 January 1913 to 26 December 19131914: 21 January 1914 to 21 December 19141915: 7 January 1915 to 29 December 19151916: 2 January 1916 to 22 December 19161918: 7 January 1918 to 31 December 19181920: 9 January 1920 to 27 December 19201921: 5 January 1921 to 29 December 19211922: 11 January 1922 to 29 December 19221923: 1 January 1923 to 28 December 19231924: 3 January 1924 to 25 December 19241927: 11 January 1927 to 31 December 19271930: 12 January 1930 to 27 December 19301931: 6 January 1931 to 25 December 19311932: 2 January 1932 to 28 December 19321933: 9 January 1933 to 26 December 19331936: 3 January 1936 to 31 December 19361937: 3 January 1937 to 31 December 19371938: 2 January 1938 to 27 December 19381939: 6 January 1939 to 20 December 19391940: 13 January 1940 to 30 December 19401941: 4 January 1941 to 24 December 19411942: 2 January 1942 to 31 December 19421943: 4 January 1943 to 27 December 19431944: 7 January 1944 to 28 December 19441945: 2 January 1945 to 31 December 19451946: 10 January 1946 to 30 December 19461947: 4 January 1947 to 27 December 19471948: 2 January 1948 to 20 December 19481949: 22 January 1949 to 3 December 19491950: 7 January 1950 to 26 November 19501957: 7 January 1957 to 21 December 19571898191619231932193919441949JanFebMarAprMayJunJulAugSepOctNovDec
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
18981898-01-051898-12-31
19121912-01-091912-12-30
19131913-01-031913-12-26
19141914-01-211914-12-21
19151915-01-071915-12-29
19161916-01-021916-12-22
19181918-01-071918-12-31
19201920-01-091920-12-27
19211921-01-051921-12-29
19221922-01-111922-12-29
19231923-01-011923-12-28
19241924-01-031924-12-25
19271927-01-111927-12-31
19301930-01-121930-12-27
19311931-01-061931-12-25
19321932-01-021932-12-28
19331933-01-091933-12-26
19361936-01-031936-12-31
19371937-01-031937-12-31
19381938-01-021938-12-27
19391939-01-061939-12-20
19401940-01-131940-12-30
19411941-01-041941-12-24
19421942-01-021942-12-31
19431943-01-041943-12-27
19441944-01-071944-12-28
19451945-01-021945-12-31
19461946-01-101946-12-30
19471947-01-041947-12-27
19481948-01-021948-12-20
19491949-01-221949-12-03
19501950-01-071950-11-26
19571957-01-071957-12-21

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 rain3348189823
25 mm (0.98 in): Days with 25 mm or more rain332519454
50 mm (1.97 in): Days with 50 mm or more rain28819202
100 mm (3.94 in): Days with 100 mm or more rain9219322
200 mm (7.87 in): Days with 200 mm or more rain1119381
10 cm (3.9 in): Days with 10 cm or more snowfall141219569
25 cm (9.8 in): Days with 25 cm or more snowfall6319451
50 cm (19.7 in): Days with 50 cm or more snowfall1119581

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1898.

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).