Derby Threshold Days by Year (SF005110840)

4 fixed thresholds counted per year at Derby (SF005110840): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Derby Thresholds

Derby: days with 10 mm (0.39 in) or more of precipitation in 77 years, most in 1939 with 41.
Derby: days with 25 mm (0.98 in) or more of precipitation in 77 years, most in 1939 with 16.
Derby: days with 50 mm (1.97 in) or more of precipitation in 48 years, most in 1939 with 5.
Derby: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1944 with 1.
4 fixed thresholds have at least one qualifying day at Derby.

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

77 years with a qualifying day

Days per year at Derby with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 41 in 1939.

Days with 10 mm (0.39 in) or more of precipitation per year at Derby
Year	Days	Decade average
1906	23	22
1907	23	22
1908	14	22
1909	28	22
1910	19	20
1911	19	20
1913	17	20
1915	24	20
1916	16	20
1917	27	20
1918	23	20
1919	15	20
1920	20	24
1921	33	24
1922	20	24
1923	18	24
1924	23	24
1925	32	24
1926	17	24
1927	17	24
1928	31	24
1929	29	24
1930	21	26.9
1931	31	26.9
1932	25	26.9
1933	22	26.9
1934	21	26.9
1935	19	26.9
1936	36	26.9
1937	25	26.9
1938	28	26.9
1939	41	26.9
1941	14	19
1944	27	19
1945	16	19
1950	18	23.1
1951	26	23.1
1952	20	23.1
1953	18	23.1
1954	25	23.1
1955	27	23.1
1956	26	23.1
1958	33	23.1
1959	15	23.1
1960	28	24.5
1961	28	24.5
1962	21	24.5
1963	20	24.5
1964	17	24.5
1967	35	24.5
1968	22	24.5
1969	25	24.5
1970	19	24.4
1971	24	24.4
1974	27	24.4
1975	25	24.4
1976	27	24.4
1977	28	24.4
1978	17	24.4
1979	28	24.4
1980	32	24.8
1981	28	24.8
1982	23	24.8
1983	23	24.8
1984	16	24.8
1985	20	24.8
1986	22	24.8
1987	27	24.8
1988	24	24.8
1989	33	24.8
1990	22	22.9
1991	30	22.9
1992	22	22.9
1993	13	22.9
1994	16	22.9
1995	26	22.9
1997	31	22.9

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

First to last qualifying date each year at Derby
Year	First date	Last date
1906	1906-01-08	1906-12-29
1907	1907-01-01	1907-12-24
1908	1908-02-03	1908-12-29
1909	1909-01-06	1909-12-26
1910	1910-01-10	1910-12-20
1911	1911-01-09	1911-11-28
1913	1913-01-07	1913-12-08
1915	1915-01-07	1915-12-07
1916	1916-01-05	1916-12-27
1917	1917-01-20	1917-12-30
1918	1918-01-05	1918-12-31
1919	1919-01-04	1919-12-15
1920	1920-01-02	1920-12-31
1921	1921-01-01	1921-12-28
1922	1922-01-11	1922-12-29
1923	1923-01-01	1923-12-19
1924	1924-01-27	1924-12-27
1925	1925-01-03	1925-12-28
1926	1926-01-09	1926-12-06
1927	1927-01-03	1927-12-16
1928	1928-01-01	1928-12-30
1929	1929-01-07	1929-12-19
1930	1930-01-01	1930-12-30
1931	1931-01-01	1931-12-31
1932	1932-01-13	1932-12-31
1933	1933-01-12	1933-12-30
1934	1934-01-02	1934-12-30
1935	1935-01-22	1935-12-29
1936	1936-01-01	1936-12-28
1937	1937-01-05	1937-12-31
1938	1938-01-12	1938-12-31
1939	1939-01-02	1939-12-29
1941	1941-01-22	1941-11-29
1944	1944-01-06	1944-11-26
1945	1945-02-01	1945-12-27
1950	1950-01-03	1950-12-22
1951	1951-01-01	1951-12-25
1952	1952-01-29	1952-12-16
1953	1953-02-13	1953-12-27
1954	1954-01-02	1954-12-29
1955	1955-01-02	1955-12-31
1956	1956-02-14	1956-12-24
1958	1958-01-04	1958-12-27
1959	1959-01-07	1959-12-25
1960	1960-01-20	1960-12-25
1961	1961-01-06	1961-12-12
1962	1962-01-09	1962-12-27
1963	1963-02-18	1963-12-20
1964	1964-01-13	1964-12-25
1967	1967-01-04	1967-12-23
1968	1968-01-01	1968-12-09
1969	1969-02-18	1969-12-23
1970	1970-01-15	1970-12-24
1971	1971-01-05	1971-12-19
1974	1974-01-01	1974-12-27
1975	1975-01-14	1975-12-30
1976	1976-01-08	1976-12-12
1977	1977-01-09	1977-12-31
1978	1978-01-01	1978-12-22
1979	1979-01-12	1979-12-24
1980	1980-01-13	1980-12-23
1981	1981-01-17	1981-12-16
1982	1982-01-02	1982-12-09
1983	1983-01-08	1983-12-25
1984	1984-01-01	1984-12-18
1985	1985-01-15	1985-12-18
1986	1986-01-03	1986-12-29
1987	1987-01-09	1987-12-26
1988	1988-01-05	1988-12-24
1989	1989-01-04	1989-12-31
1990	1990-01-20	1990-12-15
1991	1991-01-03	1991-12-25
1992	1992-01-01	1992-12-31
1993	1993-01-22	1993-12-29
1994	1994-01-01	1994-12-29
1995	1995-01-09	1995-12-25
1997	1997-01-09	1997-11-29

Every Fixed Threshold

Fixed thresholds at Derby
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	77	41	1939	31
25 mm (0.98 in): Days with 25 mm or more rain	77	16	1939	8
50 mm (1.97 in): Days with 50 mm or more rain	48	5	1939	3
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1944	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1906.

Download the Data

Data for Derby 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).

Derby Threshold Days by Year (SF005110840)

Key Facts for Derby Thresholds

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

Every Fixed Threshold

Download the Data

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