Blackdown Threshold Days by Year (SF000097830)

4 fixed thresholds counted per year at Blackdown (SF000097830): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Blackdown Thresholds

Blackdown: days with 10 mm (0.39 in) or more of precipitation in 72 years, most in 1976 with 27.
Blackdown: days with 25 mm (0.98 in) or more of precipitation in 67 years, most in 1971 with 9.
Blackdown: days with 50 mm (1.97 in) or more of precipitation in 32 years, most in 1981 with 4.
Blackdown: days with 100 mm (3.94 in) or more of precipitation in 4 years, most in 1928 with 1.
4 fixed thresholds have at least one qualifying day at Blackdown.

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

72 years with a qualifying day

Days per year at Blackdown with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 27 in 1976.

Days with 10 mm (0.39 in) or more of precipitation per year at Blackdown
Year	Days	Decade average
1922	11	10
1923	10	10
1924	8	10
1925	10	10
1927	8	10
1928	9	10
1929	14	10
1930	15	13.4
1931	20	13.4
1932	8	13.4
1933	11	13.4
1934	14	13.4
1935	16	13.4
1936	14	13.4
1937	9	13.4
1939	14	13.4
1940	12	12.1
1941	15	12.1
1943	13	12.1
1944	9	12.1
1945	16	12.1
1946	9	12.1
1947	14	12.1
1948	11	12.1
1949	10	12.1
1950	11	12.7
1951	11	12.7
1952	13	12.7
1953	16	12.7
1954	10	12.7
1955	13	12.7
1956	14	12.7
1957	13	12.7
1958	10	12.7
1959	16	12.7
1960	15	15.8
1961	14	15.8
1962	20	15.8
1963	9	15.8
1964	19	15.8
1965	24	15.8
1966	17	15.8
1968	13	15.8
1969	11	15.8
1970	12	19.2
1971	18	19.2
1972	21	19.2
1973	17	19.2
1974	22	19.2
1975	22	19.2
1976	27	19.2
1977	24	19.2
1978	14	19.2
1979	15	19.2
1980	17	16.6
1981	21	16.6
1982	20	16.6
1983	18	16.6
1984	7	16.6
1985	18	16.6
1986	14	16.6
1987	12	16.6
1988	16	16.6
1989	23	16.6
1990	13	12.4
1991	5	12.4
1992	14	12.4
1993	12	12.4
1994	12	12.4
1995	17	12.4
1996	15	12.4
1997	11	12.4

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

First to last qualifying date each year at Blackdown
Year	First date	Last date
1922	1922-01-11	1922-11-04
1923	1923-04-06	1923-11-24
1924	1924-01-10	1924-08-31
1925	1925-03-16	1925-12-16
1927	1927-02-24	1927-12-10
1928	1928-03-28	1928-12-21
1929	1929-02-14	1929-12-29
1930	1930-01-14	1930-11-30
1931	1931-01-15	1931-12-31
1932	1932-02-12	1932-12-07
1933	1933-02-23	1933-11-27
1934	1934-01-12	1934-11-19
1935	1935-02-05	1935-12-16
1936	1936-02-16	1936-12-04
1937	1937-02-19	1937-12-24
1939	1939-01-01	1939-11-03
1940	1940-01-29	1940-11-11
1941	1941-01-08	1941-12-23
1943	1943-01-21	1943-11-22
1944	1944-03-08	1944-10-22
1945	1945-04-22	1945-11-09
1946	1946-02-13	1946-08-09
1947	1947-02-07	1947-11-12
1948	1948-01-20	1948-12-20
1949	1949-01-22	1949-11-28
1950	1950-04-18	1950-10-22
1951	1951-01-10	1951-10-13
1952	1952-01-16	1952-12-15
1953	1953-01-12	1953-11-10
1954	1954-02-10	1954-11-05
1955	1955-01-22	1955-11-30
1956	1956-02-23	1956-12-18
1957	1957-05-30	1957-10-16
1958	1958-03-01	1958-12-13
1959	1959-01-09	1959-10-30
1960	1960-02-01	1960-12-17
1961	1961-01-03	1961-10-19
1962	1962-01-18	1962-12-26
1963	1963-01-03	1963-11-07
1964	1964-01-31	1964-11-05
1965	1965-02-16	1965-12-17
1966	1966-01-31	1966-11-03
1968	1968-03-24	1968-11-13
1969	1969-01-20	1969-11-07
1970	1970-01-31	1970-12-05
1971	1971-01-23	1971-12-12
1972	1972-01-09	1972-12-15
1973	1973-01-12	1973-12-05
1974	1974-01-15	1974-11-11
1975	1975-01-29	1975-12-26
1976	1976-01-22	1976-11-23
1977	1977-01-30	1977-12-02
1978	1978-01-05	1978-12-22
1979	1979-01-01	1979-12-25
1980	1980-01-03	1980-12-15
1981	1981-01-23	1981-12-23
1982	1982-02-17	1982-12-30
1983	1983-02-01	1983-12-16
1984	1984-03-05	1984-12-02
1985	1985-01-09	1985-12-02
1986	1986-02-22	1986-11-07
1987	1987-02-09	1987-12-22
1988	1988-03-05	1988-12-19
1989	1989-01-15	1989-11-15
1990	1990-02-09	1990-12-24
1991	1991-01-26	1991-12-03
1992	1992-01-01	1992-11-11
1993	1993-01-30	1993-12-14
1994	1994-02-03	1994-12-23
1995	1995-02-15	1995-12-26
1996	1996-01-23	1996-11-21
1997	1997-02-16	1997-11-16

Every Fixed Threshold

Fixed thresholds at Blackdown
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	72	27	1976	11
25 mm (0.98 in): Days with 25 mm or more rain	67	9	1971	2
50 mm (1.97 in): Days with 50 mm or more rain	32	4	1981	1
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1928	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1922.

Download the Data

Data for Blackdown 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).

Blackdown Threshold Days by Year (SF000097830)

Key Facts for Blackdown Thresholds

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

Every Fixed Threshold

Download the Data

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