Dartnall Threshold Days by Year (ASN00010543)

4 fixed thresholds counted per year at Dartnall (ASN00010543): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dartnall Thresholds

Dartnall: days with 10 mm (0.39 in) or more of precipitation in 68 years, most in 1939 with 20.
Dartnall: days with 25 mm (0.98 in) or more of precipitation in 49 years, most in 2005 with 7.
Dartnall: days with 50 mm (1.97 in) or more of precipitation in 13 years, most in 1955 with 2.
Dartnall: days with 100 mm (3.94 in) or more of precipitation in 3 years, most in 1982 with 2.
4 fixed thresholds have at least one qualifying day at Dartnall.

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

68 years with a qualifying day

Days per year at Dartnall with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 20 in 1939.

Days with 10 mm (0.39 in) or more of precipitation per year at Dartnall
Year	Days	Decade average
1922	11	11
1923	10	11
1929	12	11
1930	8	11.8
1934	11	11.8
1938	8	11.8
1939	20	11.8
1941	11	10.9
1942	14	10.9
1943	12	10.9
1944	6	10.9
1945	12	10.9
1946	14	10.9
1947	10	10.9
1948	8	10.9
1951	13	11.8
1952	11	11.8
1953	11	11.8
1954	4	11.8
1955	17	11.8
1957	8	11.8
1958	14	11.8
1959	16	11.8
1960	12	12.3
1961	17	12.3
1962	8	12.3
1963	17	12.3
1964	14	12.3
1965	10	12.3
1966	12	12.3
1967	17	12.3
1968	11	12.3
1969	5	12.3
1970	12	10.9
1971	13	10.9
1972	9	10.9
1973	9	10.9
1974	19	10.9
1975	12	10.9
1976	11	10.9
1977	9	10.9
1978	9	10.9
1979	6	10.9
1980	14	10.4
1981	10	10.4
1982	9	10.4
1983	14	10.4
1984	11	10.4
1985	7	10.4
1986	7	10.4
1987	5	10.4
1988	15	10.4
1989	12	10.4
1990	10	9.4
1991	12	9.4
1992	9	9.4
1994	8	9.4
1995	10	9.4
1996	9	9.4
1997	7	9.4
1998	12	9.4
1999	8	9.4
2000	5	7
2002	5	7
2003	9	7
2004	4	7
2005	12	7
2006	7	7

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

First to last qualifying date each year at Dartnall
Year	First date	Last date
1922	1922-03-02	1922-11-28
1923	1923-03-26	1923-09-18
1929	1929-02-15	1929-11-06
1930	1930-05-01	1930-12-13
1934	1934-01-15	1934-08-23
1938	1938-03-14	1938-09-27
1939	1939-01-19	1939-11-02
1941	1941-03-17	1941-12-13
1942	1942-03-13	1942-12-02
1943	1943-01-31	1943-10-11
1944	1944-05-18	1944-08-28
1945	1945-03-26	1945-08-22
1946	1946-04-20	1946-11-14
1947	1947-04-07	1947-11-27
1948	1948-05-03	1948-12-24
1951	1951-01-02	1951-12-01
1952	1952-03-29	1952-12-20
1953	1953-02-02	1953-11-04
1954	1954-05-22	1954-09-02
1955	1955-02-06	1955-10-17
1957	1957-01-20	1957-08-28
1958	1958-05-22	1958-12-21
1959	1959-02-24	1959-12-31
1960	1960-02-21	1960-12-16
1961	1961-01-24	1961-12-23
1962	1962-05-12	1962-08-26
1963	1963-01-10	1963-12-20
1964	1964-04-01	1964-12-19
1965	1965-02-11	1965-12-24
1966	1966-02-12	1966-12-27
1967	1967-01-26	1967-12-29
1968	1968-01-27	1968-09-11
1969	1969-05-17	1969-07-27
1970	1970-02-04	1970-12-03
1971	1971-03-27	1971-11-23
1972	1972-05-31	1972-11-28
1973	1973-04-16	1973-11-14
1974	1974-02-02	1974-11-18
1975	1975-04-02	1975-11-17
1976	1976-01-07	1976-09-27
1977	1977-05-16	1977-12-23
1978	1978-01-05	1978-12-20
1979	1979-01-12	1979-11-13
1980	1980-02-11	1980-12-30
1981	1981-01-08	1981-11-26
1982	1982-01-21	1982-11-27
1983	1983-02-26	1983-12-31
1984	1984-04-30	1984-11-16
1985	1985-04-09	1985-09-21
1986	1986-02-22	1986-09-11
1987	1987-05-10	1987-10-31
1988	1988-02-12	1988-10-20
1989	1989-01-14	1989-11-13
1990	1990-01-29	1990-10-10
1991	1991-02-25	1991-12-25
1992	1992-05-14	1992-11-15
1994	1994-05-23	1994-10-14
1995	1995-03-24	1995-12-29
1996	1996-05-30	1996-10-22
1997	1997-02-20	1997-08-09
1998	1998-03-20	1998-11-18
1999	1999-05-11	1999-12-13
2000	2000-01-11	2000-07-04
2002	2002-03-23	2002-11-01
2003	2003-02-17	2003-10-28
2004	2004-06-11	2004-12-29
2005	2005-03-19	2005-11-27
2006	2006-01-13	2006-08-22

Every Fixed Threshold

Fixed thresholds at Dartnall
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	68	20	1939	7
25 mm (0.98 in): Days with 25 mm or more rain	49	7	2005	7
50 mm (1.97 in): Days with 50 mm or more rain	13	2	1955	1
100 mm (3.94 in): Days with 100 mm or more rain	3	2	1982	2

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 Dartnall 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).

Dartnall Threshold Days by Year (ASN00010543)

Key Facts for Dartnall Thresholds

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

Every Fixed Threshold

Download the Data

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