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Built 2026-10-19 (19 October 2026)

Riverton Threshold Days by Year (USC00216972)

7 fixed thresholds counted per year at Riverton (USC00216972): 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 36 years, most in 1986 with 36.
  • Riverton: days with 25 mm (0.98 in) or more of precipitation in 36 years, most in 1963 with 9.
  • Riverton: days with 50 mm (1.97 in) or more of precipitation in 24 years, most in 1952 with 3.
  • Riverton: days with 10 cm (3.9 in) or more of snowfall in 19 years, most in 1982 with 7.
  • 7 fixed thresholds have at least one qualifying day at Riverton.
36 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 36 in 1986. 0102030401949: 231950: 171951: 301952: 171953: 271954: 201955: 191956: 181957: 211958: 131959: 191960: 121961: 191962: 181963: 241964: 221965: 291966: 211967: 111968: 271969: 211970: 171971: 281972: 271973: 271974: 181975: 251976: 81982: 271983: 191984: 211985: 281986: 361987: 161988: 251989: 22194919531957196119651969197319821986
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 36 in 1986.
Days with 10 mm (0.39 in) or more of precipitation per year at Riverton
YearDaysDecade average
19492323
19501720.1
19513020.1
19521720.1
19532720.1
19542020.1
19551920.1
19561820.1
19572120.1
19581320.1
19591920.1
19601220.4
19611920.4
19621820.4
19632420.4
19642220.4
19652920.4
19662120.4
19671120.4
19682720.4
19692120.4
19701721.4
19712821.4
19722721.4
19732721.4
19741821.4
19752521.4
1976821.4
19822724.3
19831924.3
19842124.3
19852824.3
19863624.3
19871624.3
19882524.3
19892224.3
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). 1949: 4 January 1949 to 10 December 19491950: 24 January 1950 to 1 October 19501951: 24 February 1951 to 13 November 19511952: 15 January 1952 to 31 August 19521953: 15 January 1953 to 4 December 19531954: 19 March 1954 to 12 October 19541955: 20 February 1955 to 4 December 19551956: 28 March 1956 to 5 November 19561957: 21 February 1957 to 2 November 19571958: 1 June 1958 to 18 November 19581959: 4 May 1959 to 28 December 19591960: 13 April 1960 to 5 December 19601961: 5 April 1961 to 3 November 19611962: 16 February 1962 to 10 September 19621963: 12 March 1963 to 8 December 19631964: 20 March 1964 to 11 November 19641965: 10 February 1965 to 12 December 19651966: 9 February 1966 to 27 November 19661967: 7 January 1967 to 17 December 19671968: 19 March 1968 to 23 December 19681969: 8 January 1969 to 9 December 19691970: 16 April 1970 to 4 December 19701971: 27 February 1971 to 18 November 19711972: 4 March 1972 to 30 December 19721973: 20 April 1973 to 21 November 19731974: 1 April 1974 to 2 November 19741975: 12 January 1975 to 20 November 19751976: 28 May 1976 to 26 August 19761982: 23 January 1982 to 20 November 19821983: 31 March 1983 to 24 November 19831984: 17 February 1984 to 16 December 19841985: 4 March 1985 to 1 December 19851986: 20 February 1986 to 10 November 19861987: 23 March 1987 to 6 December 19871988: 8 March 1988 to 27 December 19881989: 14 March 1989 to 28 October 198919491954195919641969197419841989JanFebMarAprMayJunJulAugSepOctNovDec
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
19491949-01-041949-12-10
19501950-01-241950-10-01
19511951-02-241951-11-13
19521952-01-151952-08-31
19531953-01-151953-12-04
19541954-03-191954-10-12
19551955-02-201955-12-04
19561956-03-281956-11-05
19571957-02-211957-11-02
19581958-06-011958-11-18
19591959-05-041959-12-28
19601960-04-131960-12-05
19611961-04-051961-11-03
19621962-02-161962-09-10
19631963-03-121963-12-08
19641964-03-201964-11-11
19651965-02-101965-12-12
19661966-02-091966-11-27
19671967-01-071967-12-17
19681968-03-191968-12-23
19691969-01-081969-12-09
19701970-04-161970-12-04
19711971-02-271971-11-18
19721972-03-041972-12-30
19731973-04-201973-11-21
19741974-04-011974-11-02
19751975-01-121975-11-20
19761976-05-281976-08-26
19821982-01-231982-11-20
19831983-03-311983-11-24
19841984-02-171984-12-16
19851985-03-041985-12-01
19861986-02-201986-11-10
19871987-03-231987-12-06
19881988-03-081988-12-27
19891989-03-141989-10-28

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 rain3636198622
25 mm (0.98 in): Days with 25 mm or more rain36919637
50 mm (1.97 in): Days with 50 mm or more rain24319521
100 mm (3.94 in): Days with 100 mm or more rain1119521
10 cm (3.9 in): Days with 10 cm or more snowfall19719822
25 cm (9.8 in): Days with 25 cm or more snowfall5119821
50 cm (19.7 in): Days with 50 cm or more snowfall10n/a1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

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).