Williamsville Threshold Days by Year (USC00238984)

7 fixed thresholds counted per year at Williamsville (USC00238984): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Williamsville Thresholds

Williamsville: days with 10 mm (0.39 in) or more of precipitation in 87 years, most in 1945 with 56.
Williamsville: days with 25 mm (0.98 in) or more of precipitation in 87 years, most in 1945 with 30.
Williamsville: days with 50 mm (1.97 in) or more of precipitation in 81 years, most in 1928 with 10.
Williamsville: days with 10 cm (3.9 in) or more of snowfall in 29 years, most in 1969 with 3.
7 fixed thresholds have at least one qualifying day at Williamsville.

Days with 10 mm (0.39 in) or more of precipitation

87 years with a qualifying day

Days per year at Williamsville with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 56 in 1945.

Days with 10 mm (0.39 in) or more of precipitation per year at Williamsville
Year	Days	Decade average
1924	37	43.7
1925	33	43.7
1926	42	43.7
1927	54	43.7
1928	47	43.7
1929	49	43.7
1930	22	35.4
1931	33	35.4
1932	33	35.4
1933	43	35.4
1934	33	35.4
1935	52	35.4
1936	24	35.4
1937	43	35.4
1938	33	35.4
1939	38	35.4
1940	31	39.4
1941	32	39.4
1942	47	39.4
1943	26	39.4
1944	34	39.4
1945	56	39.4
1946	42	39.4
1949	47	39.4
1950	48	37.9
1951	47	37.9
1952	33	37.9
1953	29	37.9
1954	36	37.9
1955	31	37.9
1956	35	37.9
1957	48	37.9
1958	37	37.9
1959	35	37.9
1960	26	33.3
1961	38	33.3
1962	36	33.3
1963	26	33.3
1964	35	33.3
1965	33	33.3
1966	41	33.3
1967	32	33.3
1969	33	33.3
1970	43	39.3
1971	29	39.3
1974	40	39.3
1975	46	39.3
1976	28	39.3
1977	45	39.3
1978	35	39.3
1979	48	39.3
1980	24	36.3
1981	39	36.3
1982	42	36.3
1983	35	36.3
1984	39	36.3
1985	42	36.3
1986	34	36.3
1987	37	36.3
1988	34	36.3
1989	37	36.3
1990	55	41.6
1991	47	41.6
1992	32	41.6
1993	41	41.6
1994	39	41.6
1995	41	41.6
1996	39	41.6
1997	42	41.6
1998	46	41.6
1999	34	41.6
2000	35	38
2001	33	38
2002	42	38
2003	45	38
2004	36	38
2005	30	38
2006	41	38
2007	40	38
2008	39	38
2009	39	38
2010	31	37
2015	45	37
2016	38	37
2017	34	37
2021	37	26.5
2026	16	26.5

For each year, a bar from the first to the last day at Williamsville meeting 10 mm (0.39 in).

First to last qualifying date each year at Williamsville
Year	First date	Last date
1924	1924-02-04	1924-12-19
1925	1925-01-16	1925-12-05
1926	1926-01-18	1926-12-24
1927	1927-01-19	1927-12-28
1928	1928-01-18	1928-12-17
1929	1929-01-05	1929-12-19
1930	1930-01-02	1930-12-05
1931	1931-01-08	1931-12-31
1932	1932-01-05	1932-12-31
1933	1933-01-17	1933-12-19
1934	1934-01-04	1934-12-30
1935	1935-01-16	1935-12-07
1936	1936-02-13	1936-12-31
1937	1937-01-02	1937-12-17
1938	1938-01-21	1938-12-03
1939	1939-01-05	1939-12-27
1940	1940-01-11	1940-12-28
1941	1941-01-01	1941-12-23
1942	1942-01-01	1942-12-27
1943	1943-02-03	1943-12-28
1944	1944-02-09	1944-12-27
1945	1945-01-19	1945-11-27
1946	1946-01-05	1946-12-29
1949	1949-01-04	1949-12-26
1950	1950-01-02	1950-12-03
1951	1951-01-03	1951-12-14
1952	1952-01-02	1952-12-20
1953	1953-01-08	1953-12-03
1954	1954-01-10	1954-12-29
1955	1955-02-20	1955-11-03
1956	1956-01-19	1956-12-20
1957	1957-01-20	1957-12-20
1958	1958-01-14	1958-11-28
1959	1959-01-01	1959-12-27
1960	1960-01-15	1960-12-11
1961	1961-01-15	1961-12-17
1962	1962-01-06	1962-12-29
1963	1963-03-01	1963-12-23
1964	1964-01-09	1964-12-25
1965	1965-01-01	1965-12-25
1966	1966-01-01	1966-12-28
1967	1967-01-26	1967-12-22
1969	1969-01-17	1969-12-31
1970	1970-02-15	1970-12-31
1971	1971-01-04	1971-12-30
1974	1974-01-10	1974-12-29
1975	1975-01-03	1975-12-29
1976	1976-01-25	1976-12-11
1977	1977-01-10	1977-12-14
1978	1978-01-16	1978-12-31
1979	1979-01-01	1979-12-30
1980	1980-01-11	1980-12-09
1981	1981-01-21	1981-12-23
1982	1982-01-03	1982-12-26
1983	1983-01-23	1983-12-21
1984	1984-01-24	1984-12-31
1985	1985-01-01	1985-12-11
1986	1986-02-03	1986-12-08
1987	1987-01-10	1987-12-28
1988	1988-01-17	1988-12-28
1989	1989-01-06	1989-12-29
1990	1990-01-04	1990-12-30
1991	1991-01-06	1991-12-21
1992	1992-01-08	1992-12-29
1993	1993-01-04	1993-12-28
1994	1994-01-17	1994-12-22
1995	1995-01-06	1995-12-19
1996	1996-01-02	1996-12-24
1997	1997-01-05	1997-12-25
1998	1998-01-05	1998-12-22
1999	1999-01-02	1999-12-12
2000	2000-01-03	2000-12-14
2001	2001-02-10	2001-12-17
2002	2002-01-19	2002-12-31
2003	2003-02-14	2003-12-29
2004	2004-01-17	2004-12-30
2005	2005-01-05	2005-11-28
2006	2006-01-10	2006-12-31
2007	2007-01-13	2007-12-27
2008	2008-01-09	2008-12-28
2009	2009-01-27	2009-12-25
2010	2010-01-23	2010-11-30
2015	2015-01-03	2015-12-29
2016	2016-01-10	2016-12-24
2017	2017-01-13	2017-12-23
2021	2021-01-01	2021-12-18
2026	2026-01-25	2026-10-02

Every Fixed Threshold

Fixed thresholds at Williamsville
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	87	56	1945	16
25 mm (0.98 in): Days with 25 mm or more rain	87	30	1945	4
50 mm (1.97 in): Days with 50 mm or more rain	81	10	1928	2
100 mm (3.94 in): Days with 100 mm or more rain	16	3	1982	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	2016	1
10 cm (3.9 in): Days with 10 cm or more snowfall	29	3	1969	1
25 cm (9.8 in): Days with 25 cm or more snowfall	3	1	1970	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.

Download the Data

Data for Williamsville 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Williamsville Threshold Days by Year (USC00238984)

Key Facts for Williamsville Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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