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

Riverton Threshold Days by Year (USC00137085)

6 fixed thresholds counted per year at Riverton (USC00137085): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Riverton Thresholds

  • Riverton: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1944 with 40.
  • Riverton: days with 25 mm (0.98 in) or more of precipitation in 32 years, most in 1948 with 13.
  • Riverton: days with 50 mm (1.97 in) or more of precipitation in 26 years, most in 1958 with 4.
  • Riverton: days with 10 cm (3.9 in) or more of snowfall in 15 years, most in 1945 with 2.
  • 6 fixed thresholds have at least one qualifying day at Riverton.
32 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Riverton Days per year at Riverton with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1944. 0102030401927: 221928: 261929: 331930: 191931: 231932: 251933: 211934: 171935: 301936: 241937: 211938: 221939: 251940: 211941: 281942: 261944: 401945: 271946: 281947: 231948: 271949: 261950: 251951: 371952: 221953: 191954: 261955: 221956: 221957: 331958: 241959: 2919271931193519391944194819521956
Days per year at Riverton with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1944.
Days with 10 mm (0.39 in) or more of precipitation per year at Riverton
YearDaysDecade average
19272227
19282627
19293327
19301922.7
19312322.7
19322522.7
19332122.7
19341722.7
19353022.7
19362422.7
19372122.7
19382222.7
19392522.7
19402127.3
19412827.3
19422627.3
19444027.3
19452727.3
19462827.3
19472327.3
19482727.3
19492627.3
19502525.9
19513725.9
19522225.9
19531925.9
19542625.9
19552225.9
19562225.9
19573325.9
19582425.9
19592925.9
First to last qualifying date each year at Riverton For each year, a bar from the first to the last day at Riverton meeting 10 mm (0.39 in). 1927: 11 March 1927 to 6 October 19271928: 6 February 1928 to 29 November 19281929: 9 January 1929 to 12 November 19291930: 17 March 1930 to 19 November 19301931: 6 March 1931 to 31 December 19311932: 5 January 1932 to 24 December 19321933: 5 March 1933 to 2 December 19331934: 24 February 1934 to 27 November 19341935: 19 January 1935 to 26 November 19351936: 2 January 1936 to 5 December 19361937: 7 January 1937 to 16 October 19371938: 9 March 1938 to 3 November 19381939: 9 February 1939 to 28 December 19391940: 2 March 1940 to 15 December 19401941: 8 April 1941 to 23 December 19411942: 1 January 1942 to 27 December 19421944: 27 January 1944 to 25 November 19441945: 22 February 1945 to 30 September 19451946: 5 March 1946 to 9 November 19461947: 12 March 1947 to 14 November 19471948: 2 March 1948 to 29 December 19481949: 3 January 1949 to 12 November 19491950: 12 February 1950 to 8 November 19501951: 25 February 1951 to 12 November 19511952: 2 March 1952 to 25 November 19521953: 1 March 1953 to 2 December 19531954: 19 February 1954 to 26 October 19541955: 5 January 1955 to 28 October 19551956: 3 April 1956 to 20 November 19561957: 17 March 1957 to 25 December 19571958: 27 February 1958 to 17 November 19581959: 5 March 1959 to 27 December 195919271931193519391944194819521956JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Riverton meeting 10 mm (0.39 in).
First to last qualifying date each year at Riverton
YearFirst dateLast date
19271927-03-111927-10-06
19281928-02-061928-11-29
19291929-01-091929-11-12
19301930-03-171930-11-19
19311931-03-061931-12-31
19321932-01-051932-12-24
19331933-03-051933-12-02
19341934-02-241934-11-27
19351935-01-191935-11-26
19361936-01-021936-12-05
19371937-01-071937-10-16
19381938-03-091938-11-03
19391939-02-091939-12-28
19401940-03-021940-12-15
19411941-04-081941-12-23
19421942-01-011942-12-27
19441944-01-271944-11-25
19451945-02-221945-09-30
19461946-03-051946-11-09
19471947-03-121947-11-14
19481948-03-021948-12-29
19491949-01-031949-11-12
19501950-02-121950-11-08
19511951-02-251951-11-12
19521952-03-021952-11-25
19531953-03-011953-12-02
19541954-02-191954-10-26
19551955-01-051955-10-28
19561956-04-031956-11-20
19571957-03-171957-12-25
19581958-02-271958-11-17
19591959-03-051959-12-27

Every Fixed Threshold

Fixed thresholds at Riverton
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3240194429
25 mm (0.98 in): Days with 25 mm or more rain3213194810
50 mm (1.97 in): Days with 50 mm or more rain26419581
100 mm (3.94 in): Days with 100 mm or more rain5119441
10 cm (3.9 in): Days with 10 cm or more snowfall15219451
25 cm (9.8 in): Days with 25 cm or more snowfall3119451

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1927.

Download the Data

  • Data for Riverton 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).