Summit Threshold Days by Year (USC00358182)

6 fixed thresholds counted per year at Summit (USC00358182): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Summit Thresholds

Summit: days with 10 mm (0.39 in) or more of precipitation in 76 years, most in 1950 with 80.
Summit: days with 25 mm (0.98 in) or more of precipitation in 76 years, most in 1971 with 29.
Summit: days with 50 mm (1.97 in) or more of precipitation in 70 years, most in 1953 with 7.
Summit: days with 10 cm (3.9 in) or more of snowfall in 30 years, most in 1916 with 7.
6 fixed thresholds have at least one qualifying day at Summit.

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

76 years with a qualifying day

Days per year at Summit with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 80 in 1950.

Days with 10 mm (0.39 in) or more of precipitation per year at Summit
Year	Days	Decade average
1910	53	54.3
1911	49	54.3
1912	65	54.3
1913	47	54.3
1914	57	54.3
1915	45	54.3
1916	64	54.3
1924	48	49.8
1925	54	49.8
1926	45	49.8
1927	64	49.8
1928	53	49.8
1929	35	49.8
1930	43	54.6
1931	61	54.6
1932	66	54.6
1933	70	54.6
1934	53	54.6
1935	43	54.6
1936	40	54.6
1937	72	54.6
1938	56	54.6
1939	42	54.6
1940	60	54.4
1941	50	54.4
1942	55	54.4
1943	45	54.4
1944	32	54.4
1945	79	54.4
1946	55	54.4
1947	53	54.4
1948	58	54.4
1949	57	54.4
1950	80	57.1
1951	67	57.1
1952	43	57.1
1953	69	57.1
1954	54	57.1
1955	66	57.1
1957	46	57.1
1958	47	57.1
1959	42	57.1
1960	65	60.6
1961	64	60.6
1962	54	60.6
1963	62	60.6
1964	67	60.6
1965	50	60.6
1966	56	60.6
1967	54	60.6
1968	76	60.6
1969	58	60.6
1970	67	59.1
1971	77	59.1
1972	59	59.1
1973	65	59.1
1974	63	59.1
1975	65	59.1
1976	40	59.1
1977	60	59.1
1978	42	59.1
1979	53	59.1
1980	55	60.2
1981	57	60.2
1982	67	60.2
1983	78	60.2
1984	76	60.2
1985	46	60.2
1986	56	60.2
1987	55	60.2
1988	57	60.2
1989	55	60.2
1990	57	47.8
1991	49	47.8
1992	42	47.8
1993	43	47.8

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

First to last qualifying date each year at Summit
Year	First date	Last date
1910	1910-01-07	1910-12-30
1911	1911-01-09	1911-12-31
1912	1912-01-05	1912-12-31
1913	1913-01-03	1913-12-31
1914	1914-01-02	1914-12-26
1915	1915-01-01	1915-12-28
1916	1916-01-06	1916-12-23
1924	1924-01-03	1924-12-30
1925	1925-01-01	1925-12-23
1926	1926-01-06	1926-12-25
1927	1927-01-02	1927-12-29
1928	1928-01-01	1928-12-31
1929	1929-01-02	1929-12-25
1930	1930-01-01	1930-12-23
1931	1931-01-02	1931-12-31
1932	1932-01-09	1932-12-31
1933	1933-01-01	1933-12-29
1934	1934-01-03	1934-12-30
1935	1935-01-06	1935-12-30
1936	1936-01-01	1936-12-26
1937	1937-01-04	1937-12-30
1938	1938-01-14	1938-12-28
1939	1939-01-02	1939-12-28
1940	1940-01-01	1940-12-30
1941	1941-01-05	1941-12-23
1942	1942-01-05	1942-12-31
1943	1943-01-01	1943-12-25
1944	1944-01-01	1944-12-29
1945	1945-01-05	1945-12-29
1946	1946-01-02	1946-12-27
1947	1947-01-10	1947-12-30
1948	1948-01-01	1948-12-29
1949	1949-01-01	1949-12-31
1950	1950-01-06	1950-12-31
1951	1951-01-02	1951-12-31
1952	1952-01-04	1952-12-30
1953	1953-01-02	1953-12-20
1954	1954-01-03	1954-12-31
1955	1955-01-03	1955-12-27
1957	1957-01-02	1957-12-29
1958	1958-01-11	1958-12-26
1959	1959-01-08	1959-12-25
1960	1960-01-08	1960-12-26
1961	1961-01-05	1961-12-27
1962	1962-01-03	1962-12-15
1963	1963-01-02	1963-12-31
1964	1964-01-02	1964-12-31
1965	1965-01-02	1965-12-31
1966	1966-01-01	1966-12-25
1967	1967-01-01	1967-12-18
1968	1968-01-09	1968-12-28
1969	1969-01-01	1969-12-27
1970	1970-01-04	1970-12-31
1971	1971-01-09	1971-12-25
1972	1972-01-08	1972-12-28
1973	1973-01-12	1973-12-29
1974	1974-01-12	1974-12-30
1975	1975-01-04	1975-12-30
1976	1976-01-04	1976-12-27
1977	1977-01-13	1977-12-30
1978	1978-01-04	1978-12-21
1979	1979-01-10	1979-12-31
1980	1980-01-01	1980-12-27
1981	1981-01-26	1981-12-28
1982	1982-01-01	1982-12-23
1983	1983-01-04	1983-12-31
1984	1984-01-03	1984-12-30
1985	1985-02-02	1985-12-07
1986	1986-01-01	1986-12-29
1987	1987-01-01	1987-12-31
1988	1988-01-09	1988-12-31
1989	1989-01-05	1989-12-08
1990	1990-01-01	1990-12-28
1991	1991-01-08	1991-12-22
1992	1992-01-02	1992-12-28
1993	1993-01-04	1993-12-31

Every Fixed Threshold

Fixed thresholds at Summit
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	76	80	1950	43
25 mm (0.98 in): Days with 25 mm or more rain	76	29	1971	7
50 mm (1.97 in): Days with 50 mm or more rain	70	7	1953	1
100 mm (3.94 in): Days with 100 mm or more rain	5	2	1961	1
10 cm (3.9 in): Days with 10 cm or more snowfall	30	7	1916	3
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1971	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1910.

Download the Data

Data for Summit 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Summit Threshold Days by Year (USC00358182)

Key Facts for Summit Thresholds

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

Every Fixed Threshold

Download the Data

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