Runnymede (Whitemarsh) Threshold Days by Year (ASN00094060)

4 fixed thresholds counted per year at Runnymede (Whitemarsh) (ASN00094060): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Runnymede (Whitemarsh) Thresholds

Runnymede (Whitemarsh): days with 10 mm (0.39 in) or more of precipitation in 65 years, most in 1974 with 33.
Runnymede (Whitemarsh): days with 25 mm (0.98 in) or more of precipitation in 64 years, most in 1970 with 12.
Runnymede (Whitemarsh): days with 50 mm (1.97 in) or more of precipitation in 39 years, most in 1970 with 6.
Runnymede (Whitemarsh): days with 100 mm (3.94 in) or more of precipitation in 6 years, most in 1935 with 1.
4 fixed thresholds have at least one qualifying day at Runnymede (Whitemarsh).

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

65 years with a qualifying day

Days per year at Runnymede (Whitemarsh) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 33 in 1974.

Days with 10 mm (0.39 in) or more of precipitation per year at Runnymede (Whitemarsh)
Year	Days	Decade average
1933	16	19.9
1934	22	19.9
1935	25	19.9
1936	10	19.9
1937	22	19.9
1938	23	19.9
1939	21	19.9
1940	13	19.5
1941	21	19.5
1942	14	19.5
1943	15	19.5
1944	24	19.5
1945	11	19.5
1946	27	19.5
1947	28	19.5
1948	21	19.5
1949	21	19.5
1950	18	20.8
1951	17	20.8
1952	24	20.8
1953	27	20.8
1954	10	20.8
1955	18	20.8
1956	30	20.8
1957	19	20.8
1958	23	20.8
1959	22	20.8
1960	27	18.3
1963	10	18.3
1964	21	18.3
1965	16	18.3
1966	26	18.3
1967	13	18.3
1968	12	18.3
1969	21	18.3
1970	29	22
1971	19	22
1972	10	22
1973	19	22
1974	33	22
1975	26	22
1976	33	22
1977	17	22
1978	23	22
1979	11	22
1980	15	21.2
1981	21	21.2
1982	18	21.2
1983	21	21.2
1984	22	21.2
1985	27	21.2
1986	28	21.2
1988	22	21.2
1989	17	21.2
1990	18	17.7
1991	13	17.7
1992	15	17.7
1993	20	17.7
1994	12	17.7
1995	21	17.7
1996	20	17.7
1997	18	17.7
1998	22	17.7
2003	11	11.5
2006	12	11.5

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

First to last qualifying date each year at Runnymede (Whitemarsh)
Year	First date	Last date
1933	1933-01-05	1933-12-17
1934	1934-01-09	1934-12-31
1935	1935-01-04	1935-12-25
1936	1936-06-01	1936-12-20
1937	1937-01-02	1937-12-26
1938	1938-01-02	1938-12-23
1939	1939-02-03	1939-12-23
1940	1940-01-06	1940-12-28
1941	1941-01-17	1941-12-06
1942	1942-02-10	1942-12-24
1943	1943-01-17	1943-12-04
1944	1944-01-03	1944-12-24
1945	1945-01-17	1945-12-28
1946	1946-02-19	1946-12-29
1947	1947-02-17	1947-12-22
1948	1948-01-13	1948-12-13
1949	1949-01-04	1949-12-21
1950	1950-01-26	1950-12-20
1951	1951-02-18	1951-12-15
1952	1952-01-14	1952-12-11
1953	1953-01-06	1953-12-08
1954	1954-01-28	1954-11-21
1955	1955-04-01	1955-12-28
1956	1956-01-20	1956-11-05
1957	1957-02-03	1957-12-26
1958	1958-02-01	1958-12-17
1959	1959-01-07	1959-12-26
1960	1960-01-23	1960-12-15
1963	1963-01-17	1963-11-08
1964	1964-02-01	1964-12-25
1965	1965-01-11	1965-12-04
1966	1966-02-04	1966-12-16
1967	1967-01-16	1967-12-19
1968	1968-02-27	1968-12-24
1969	1969-02-04	1969-12-15
1970	1970-01-03	1970-12-31
1971	1971-01-01	1971-12-19
1972	1972-01-10	1972-11-07
1973	1973-01-25	1973-12-22
1974	1974-02-06	1974-12-28
1975	1975-01-10	1975-11-23
1976	1976-01-09	1976-12-24
1977	1977-01-02	1977-11-30
1978	1978-01-27	1978-12-27
1979	1979-02-26	1979-12-16
1980	1980-01-13	1980-12-29
1981	1981-01-20	1981-12-28
1982	1982-01-07	1982-12-07
1983	1983-01-27	1983-11-17
1984	1984-02-29	1984-12-26
1985	1985-01-31	1985-12-24
1986	1986-01-02	1986-12-18
1988	1988-01-31	1988-12-26
1989	1989-01-05	1989-12-12
1990	1990-01-04	1990-12-28
1991	1991-01-24	1991-12-20
1992	1992-01-02	1992-11-04
1993	1993-01-25	1993-12-29
1994	1994-01-06	1994-11-21
1995	1995-01-04	1995-12-21
1996	1996-01-01	1996-11-22
1997	1997-01-16	1997-12-02
1998	1998-01-26	1998-12-28
2003	2003-03-01	2003-09-03
2006	2006-01-01	2006-11-20

Every Fixed Threshold

Fixed thresholds at Runnymede (Whitemarsh)
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	65	33	1974	12
25 mm (0.98 in): Days with 25 mm or more rain	64	12	1970	4
50 mm (1.97 in): Days with 50 mm or more rain	39	6	1970	2
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1935	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1933.

Download the Data

Data for Runnymede (Whitemarsh) 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).

Runnymede (Whitemarsh) Threshold Days by Year (ASN00094060)

Key Facts for Runnymede (Whitemarsh) Thresholds

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

Every Fixed Threshold

Download the Data

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