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Built 2026-10-19 (19 October 2026)

Williams Threshold Days by Year (USC00049677)

16 fixed thresholds counted per year at Williams (USC00049677): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Williams Thresholds

  • Williams: days with 10 mm (0.39 in) or more of precipitation in 28 years, most in 1983 with 31.
  • Williams: days with a maximum temperature at or above 30 C (86 F) in 26 years, most in 1958 with 146.
  • Williams: days with a maximum temperature at or above 35 C (95 F) in 26 years, most in 1967 with 90.
  • Williams: days with a maximum temperature at or above 90 F (32.2 C) in 26 years, most in 1967 with 116.
  • 16 fixed thresholds have at least one qualifying day at Williams.
26 years with a qualifying day
Days at or above 30 C (86 F) per year at Williams Days per year at Williams with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 1958. 0501001501954: 1221955: 1291956: 1241957: 1061958: 1461959: 1271960: 1301961: 1211962: 1261963: 1141966: 1301967: 1361969: 1221970: 1261971: 1171972: 1131974: 1271976: 1061977: 1131978: 1181980: 1111981: 1291982: 961983: 1181984: 1161985: 117195419571960196319691972197719811984
Days per year at Williams with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 1958.
Days at or above 30 C (86 F) per year at Williams
YearDaysDecade average
1954122125.7
1955129125.7
1956124125.7
1957106125.7
1958146125.7
1959127125.7
1960130125.6
1961121125.6
1962126125.6
1963114125.6
1966130125.6
1967136125.6
1969122125.6
1970126117.1
1971117117.1
1972113117.1
1974127117.1
1976106117.1
1977113117.1
1978118117.1
1980111114.5
1981129114.5
198296114.5
1983118114.5
1984116114.5
1985117114.5
First to last qualifying date each year at Williams For each year, a bar from the first to the last day at Williams meeting 30 C (86 F). 1954: 15 April 1954 to 16 October 19541955: 6 May 1955 to 11 November 19551956: 20 April 1956 to 14 October 19561957: 6 April 1957 to 25 September 19571958: 13 April 1958 to 17 October 19581959: 24 April 1959 to 26 October 19591960: 5 April 1960 to 18 October 19601961: 3 April 1961 to 19 October 19611962: 6 April 1962 to 4 October 19621963: 16 May 1963 to 7 October 19631966: 31 March 1966 to 2 November 19661967: 15 May 1967 to 2 November 19671969: 29 April 1969 to 2 October 19691970: 2 May 1970 to 11 October 19701971: 11 May 1971 to 14 October 19711972: 17 March 1972 to 30 September 19721974: 1 May 1974 to 18 October 19741976: 1 May 1976 to 18 October 19761977: 7 April 1977 to 18 October 19771978: 3 May 1978 to 24 October 19781980: 27 April 1980 to 9 October 19801981: 22 April 1981 to 24 September 19811982: 3 May 1982 to 13 October 19821983: 14 May 1983 to 11 October 19831984: 13 April 1984 to 8 October 19841985: 3 April 1985 to 5 October 19851954195819621969197419801984JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Williams meeting 30 C (86 F).
First to last qualifying date each year at Williams
YearFirst dateLast date
19541954-04-151954-10-16
19551955-05-061955-11-11
19561956-04-201956-10-14
19571957-04-061957-09-25
19581958-04-131958-10-17
19591959-04-241959-10-26
19601960-04-051960-10-18
19611961-04-031961-10-19
19621962-04-061962-10-04
19631963-05-161963-10-07
19661966-03-311966-11-02
19671967-05-151967-11-02
19691969-04-291969-10-02
19701970-05-021970-10-11
19711971-05-111971-10-14
19721972-03-171972-09-30
19741974-05-011974-10-18
19761976-05-011976-10-18
19771977-04-071977-10-18
19781978-05-031978-10-24
19801980-04-271980-10-09
19811981-04-221981-09-24
19821982-05-031982-10-13
19831983-05-141983-10-11
19841984-04-131984-10-08
19851985-04-031985-10-05

Every Fixed Threshold

Fixed thresholds at Williams
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days261461958117
35 C (95 F): Days2690196765
40 C (104 F): Days2326196113
45 C (113 F): Days4219721
90 F (32.2 C): Days26116196789
100 F (37.8 C): Days2656196725
110 F (43.3 C): Days11519611
0 C (32 F): Ice days (max1119721
0 C (32 F): Frost days (min2549195611
20 C (68 F): Tropical nights (min241619787
25 C (77 F): Days with min1319783
10 mm (0.39 in): Days with 10 mm or more rain2831198311
25 mm (0.98 in): Days with 25 mm or more rain26919832
50 mm (1.97 in): Days with 50 mm or more rain8219581
10 cm (3.9 in): Days with 10 cm or more snowfall10n/a1
25 cm (9.8 in): Days with 25 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 1954.

Download the Data

  • Data for Williams 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).