Williams Threshold Days by Year

17 fixed thresholds counted per year at Williams (USC00029359): 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 115 years, most in 1905 with 34.
Williams: days with 10 cm (3.9 in) or more of snowfall in 114 years, most in 1965 with 19.
Williams: nights with a minimum temperature at or below 0 C (32 F) in 113 years, most in 1925 with 234.
Williams: nights with a minimum temperature at or below -10 C (14 F) in 113 years, most in 1929 with 86.
17 fixed thresholds have at least one qualifying day at Williams.

Days at or above 30 C (86 F)

99 years with a qualifying day

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 64 in 1944.

Days at or above 30 C (86 F) per year at Williams
Year	Days	Decade average
1904	24	23.5
1905	23	23.5
1912	17	29.9
1913	33	29.9
1914	29	29.9
1915	40	29.9
1916	23	29.9
1917	39	29.9
1918	34	29.9
1919	24	29.9
1920	27	34.4
1921	29	34.4
1922	36	34.4
1923	22	34.4
1924	47	34.4
1925	32	34.4
1926	35	34.4
1927	22	34.4
1928	48	34.4
1929	46	34.4
1930	29	38.7
1931	43	38.7
1932	34	38.7
1933	56	38.7
1934	22	38.7
1935	42	38.7
1936	40	38.7
1937	43	38.7
1938	32	38.7
1939	46	38.7
1940	42	39
1941	25	39
1942	42	39
1943	40	39
1944	64	39
1945	53	39
1946	27	39
1948	31	39
1949	27	39
1950	25	14.9
1951	21	14.9
1952	5	14.9
1953	13	14.9
1954	16	14.9
1955	9	14.9
1956	16	14.9
1957	13	14.9
1959	16	14.9
1960	27	13.4
1961	24	13.4
1962	14	13.4
1963	19	13.4
1964	10	13.4
1965	7	13.4
1966	7	13.4
1967	4	13.4
1968	10	13.4
1969	12	13.4
1970	15	20.4
1971	27	20.4
1972	28	20.4
1973	19	20.4
1974	28	20.4
1975	18	20.4
1976	7	20.4
1977	16	20.4
1978	17	20.4
1979	29	20.4
1980	21	17.2
1981	26	17.2
1982	14	17.2
1983	13	17.2
1984	8	17.2
1985	30	17.2
1986	16	17.2
1987	9	17.2
1988	18	17.2
1990	23	23.6
1991	12	23.6
1992	8	23.6
1993	19	23.6
1994	33	23.6
1995	33	23.6
1996	37	23.6
2010	19	28
2011	35	28
2013	24	28
2014	13	28
2015	27	28
2016	30	28
2017	31	28
2018	36	28
2019	37	28
2020	60	50.2
2022	31	50.2
2023	38	50.2
2024	59	50.2
2025	48	50.2
2026	65	50.2

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
Year	First date	Last date
1904	1904-06-09	1904-07-26
1905	1905-06-23	1905-09-01
1912	1912-06-01	1912-08-25
1913	1913-06-15	1913-09-21
1914	1914-06-15	1914-09-18
1915	1915-06-19	1915-09-22
1916	1916-06-06	1916-07-24
1917	1917-06-14	1917-09-05
1918	1918-06-07	1918-09-14
1919	1919-06-18	1919-08-25
1920	1920-05-21	1920-09-02
1921	1921-06-08	1921-08-13
1922	1922-06-08	1922-09-14
1923	1923-06-10	1923-09-09
1924	1924-06-04	1924-09-08
1925	1925-05-25	1925-07-27
1926	1926-06-13	1926-08-27
1927	1927-05-15	1927-08-22
1928	1928-05-29	1928-09-21
1929	1929-06-14	1929-09-20
1930	1930-04-22	1930-09-21
1931	1931-06-01	1931-08-28
1932	1932-06-14	1932-09-18
1933	1933-05-29	1933-09-30
1934	1934-05-10	1934-09-05
1935	1935-06-05	1935-09-17
1936	1936-05-24	1936-07-25
1937	1937-05-14	1937-09-18
1938	1938-05-26	1938-08-23
1939	1939-06-03	1939-08-20
1940	1940-06-11	1940-08-30
1941	1941-06-18	1941-08-21
1942	1942-06-17	1942-08-23
1943	1943-06-07	1943-09-23
1944	1944-06-29	1944-09-24
1945	1945-06-13	1945-09-16
1946	1946-06-04	1946-08-18
1948	1948-06-29	1948-09-13
1949	1949-06-14	1949-09-22
1950	1950-06-20	1950-09-03
1951	1951-05-26	1951-08-18
1952	1952-06-16	1952-08-04
1953	1953-06-21	1953-08-18
1954	1954-06-19	1954-08-29
1955	1955-06-07	1955-09-07
1956	1956-06-11	1956-09-17
1957	1957-06-24	1957-09-08
1959	1959-06-17	1959-07-27
1960	1960-06-14	1960-08-20
1961	1961-06-14	1961-08-08
1962	1962-06-24	1962-08-28
1963	1963-07-01	1963-07-31
1964	1964-06-24	1964-07-28
1965	1965-07-03	1965-08-21
1966	1966-06-18	1966-08-06
1967	1967-06-30	1967-07-03
1968	1968-06-17	1968-07-19
1969	1969-06-30	1969-08-10
1970	1970-06-20	1970-07-19
1971	1971-06-15	1971-08-03
1972	1972-06-28	1972-09-15
1973	1973-06-08	1973-09-03
1974	1974-05-30	1974-08-31
1975	1975-07-01	1975-08-29
1976	1976-06-20	1976-07-09
1977	1977-06-24	1977-09-09
1978	1978-06-21	1978-09-28
1979	1979-06-26	1979-09-07
1980	1980-06-24	1980-08-13
1981	1981-06-06	1981-08-09
1982	1982-06-27	1982-09-07
1983	1983-07-04	1983-09-22
1984	1984-05-23	1984-08-28
1985	1985-06-07	1985-08-30
1986	1986-06-22	1986-08-07
1987	1987-06-12	1987-08-18
1988	1988-06-22	1988-08-19
1990	1990-06-04	1990-09-13
1991	1991-07-01	1991-08-21
1992	1992-07-05	1992-08-19
1993	1993-06-14	1993-08-03
1994	1994-06-10	1994-08-23
1995	1995-06-24	1995-09-04
1996	1996-05-11	1996-09-02
2010	2010-06-05	2010-09-29
2011	2011-06-21	2011-09-04
2013	2013-06-05	2013-08-17
2014	2014-06-11	2014-07-28
2015	2015-06-17	2015-08-31
2016	2016-06-03	2016-07-31
2017	2017-06-06	2017-09-05
2018	2018-06-03	2018-08-20
2019	2019-06-29	2019-09-08
2020	2020-05-29	2020-10-05
2022	2022-06-08	2022-09-06
2023	2023-07-01	2023-08-31
2024	2024-06-05	2024-10-01
2025	2025-06-11	2025-08-25
2026	2026-06-04	2026-09-10

Every Fixed Threshold

Fixed thresholds at Williams
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	99	64	1944	65
35 C (95 F): Days	34	9	1943	3
90 F (32.2 C): Days	93	31	1944	35
100 F (37.8 C): Days	1	1	1970	1
0 C (32 F): Ice days (max	95	23	1932	1
0 C (32 F): Frost days (min	113	234	1925	77
-10 C (14 F): Days with min	113	86	1929	1
-20 C (-4 F): Days with min	47	13	1932	1
-30 C (-22 F): Days with min	1	1	1937	1
20 C (68 F): Tropical nights (min	4	2	1960	1
10 mm (0.39 in): Days with 10 mm or more rain	115	34	1905	13
25 mm (0.98 in): Days with 25 mm or more rain	112	12	1965	4
50 mm (1.97 in): Days with 50 mm or more rain	40	3	1918	1
100 mm (3.94 in): Days with 100 mm or more rain	1	0	n/a	1
10 cm (3.9 in): Days with 10 cm or more snowfall	114	19	1965	1
25 cm (9.8 in): Days with 25 cm or more snowfall	76	5	1990	1
50 cm (19.7 in): Days with 50 cm or more snowfall	13	2	1990	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.

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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Williams Threshold Days by Year

Key Facts for Williams Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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