Tootool (Bryntirion) Threshold Days by Year

4 fixed thresholds counted per year at Tootool (Bryntirion) (ASN00074017): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tootool (Bryntirion) Thresholds

Tootool (Bryntirion): days with 10 mm (0.39 in) or more of precipitation in 101 years, most in 1974 with 30.
Tootool (Bryntirion): days with 25 mm (0.98 in) or more of precipitation in 94 years, most in 2022 with 11.
Tootool (Bryntirion): days with 50 mm (1.97 in) or more of precipitation in 29 years, most in 1934 with 3.
Tootool (Bryntirion): days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1934 with 1.
4 fixed thresholds have at least one qualifying day at Tootool (Bryntirion).

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

101 years with a qualifying day

Days per year at Tootool (Bryntirion) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1974.

Days with 10 mm (0.39 in) or more of precipitation per year at Tootool (Bryntirion)
Year	Days	Decade average
1912	13	14.5
1913	18	14.5
1914	7	14.5
1915	15	14.5
1916	20	14.5
1917	23	14.5
1918	13	14.5
1919	7	14.5
1920	16	15.3
1921	20	15.3
1922	11	15.3
1923	12	15.3
1924	22	15.3
1925	18	15.3
1926	16	15.3
1927	12	15.3
1928	18	15.3
1929	8	15.3
1930	15	17.4
1931	25	17.4
1932	19	17.4
1933	12	17.4
1934	20	17.4
1935	15	17.4
1936	21	17.4
1937	13	17.4
1938	8	17.4
1939	26	17.4
1940	5	13.5
1941	13	13.5
1942	19	13.5
1943	12	13.5
1944	6	13.5
1945	12	13.5
1946	17	13.5
1947	22	13.5
1948	15	13.5
1949	14	13.5
1950	26	17.4
1951	13	17.4
1952	21	17.4
1953	14	17.4
1954	18	17.4
1955	17	17.4
1956	29	17.4
1957	9	17.4
1958	18	17.4
1959	9	17.4
1960	20	16.4
1961	18	16.4
1962	17	16.4
1963	16	16.4
1964	15	16.4
1965	10	16.4
1966	17	16.4
1967	5	16.4
1968	22	16.4
1969	24	16.4
1970	22	17.7
1971	13	17.7
1972	11	17.7
1973	29	17.7
1974	30	17.7
1975	16	17.7
1976	13	17.7
1977	10	17.7
1978	19	17.7
1979	14	17.7
1980	13	16.7
1981	13	16.7
1982	7	16.7
1983	20	16.7
1984	18	16.7
1985	21	16.7
1986	22	16.7
1987	12	16.7
1988	18	16.7
1989	23	16.7
1990	17	18.1
1991	10	18.1
1992	22	18.1
1993	29	18.1
1994	14	18.1
1995	21	18.1
1996	20	18.1
1997	14	18.1
1998	13	18.1
1999	21	18.1
2000	20	11
2001	13	11
2002	8	11
2003	10	11
2004	9	11
2006	6	11
2018	11	10.5
2019	10	10.5
2020	18	17.4
2022	27	17.4
2023	15	17.4
2024	19	17.4
2026	8	17.4

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

First to last qualifying date each year at Tootool (Bryntirion)
Year	First date	Last date
1912	1912-02-25	1912-12-03
1913	1913-01-03	1913-12-31
1914	1914-03-25	1914-12-15
1915	1915-02-20	1915-12-15
1916	1916-01-29	1916-12-25
1917	1917-01-23	1917-11-22
1918	1918-01-11	1918-10-24
1919	1919-02-19	1919-12-27
1920	1920-06-02	1920-12-10
1921	1921-01-03	1921-12-27
1922	1922-01-13	1922-12-31
1923	1923-05-10	1923-12-27
1924	1924-01-03	1924-12-15
1925	1925-01-13	1925-11-20
1926	1926-01-04	1926-12-18
1927	1927-01-06	1927-10-27
1928	1928-01-19	1928-10-15
1929	1929-02-17	1929-12-28
1930	1930-05-12	1930-12-25
1931	1931-01-02	1931-11-16
1932	1932-02-06	1932-10-13
1933	1933-01-21	1933-12-15
1934	1934-01-06	1934-12-01
1935	1935-01-14	1935-12-03
1936	1936-01-05	1936-12-15
1937	1937-01-19	1937-12-29
1938	1938-02-05	1938-10-24
1939	1939-02-27	1939-11-21
1940	1940-04-04	1940-05-01
1941	1941-01-03	1941-10-05
1942	1942-02-14	1942-12-09
1943	1943-01-03	1943-11-18
1944	1944-04-09	1944-10-17
1945	1945-03-30	1945-12-18
1946	1946-01-18	1946-12-25
1947	1947-03-02	1947-12-25
1948	1948-01-02	1948-12-30
1949	1949-02-21	1949-11-22
1950	1950-01-19	1950-12-22
1951	1951-05-24	1951-11-27
1952	1952-03-22	1952-12-11
1953	1953-01-06	1953-11-07
1954	1954-01-29	1954-12-11
1955	1955-02-11	1955-12-04
1956	1956-01-03	1956-12-14
1957	1957-02-08	1957-12-31
1958	1958-02-20	1958-12-17
1959	1959-02-12	1959-11-04
1960	1960-01-04	1960-12-04
1961	1961-01-01	1961-12-27
1962	1962-01-09	1962-11-21
1963	1963-01-03	1963-11-07
1964	1964-01-09	1964-12-23
1965	1965-05-31	1965-12-01
1966	1966-01-30	1966-12-07
1967	1967-05-20	1967-10-04
1968	1968-01-05	1968-12-26
1969	1969-02-10	1969-12-12
1970	1970-01-02	1970-12-10
1971	1971-01-31	1971-12-27
1972	1972-01-05	1972-11-03
1973	1973-01-13	1973-12-31
1974	1974-01-04	1974-11-27
1975	1975-01-25	1975-12-30
1976	1976-01-07	1976-12-25
1977	1977-02-23	1977-06-30
1978	1978-01-05	1978-12-04
1979	1979-02-15	1979-11-12
1980	1980-03-07	1980-12-17
1981	1981-01-29	1981-10-18
1982	1982-01-26	1982-09-27
1983	1983-01-02	1983-12-07
1984	1984-01-02	1984-10-04
1985	1985-03-18	1985-12-08
1986	1986-01-16	1986-12-08
1987	1987-02-21	1987-12-02
1988	1988-03-31	1988-12-26
1989	1989-01-18	1989-12-14
1990	1990-01-08	1990-10-22
1991	1991-01-06	1991-09-11
1992	1992-01-10	1992-12-26
1993	1993-01-03	1993-12-26
1994	1994-02-01	1994-12-23
1995	1995-01-06	1995-12-06
1996	1996-01-01	1996-12-07
1997	1997-01-07	1997-11-11
1998	1998-02-08	1998-12-16
1999	1999-01-22	1999-12-28
2000	2000-01-27	2000-11-13
2001	2001-01-25	2001-11-07
2002	2002-01-23	2002-09-17
2003	2003-02-21	2003-11-22
2004	2004-04-07	2004-12-12
2006	2006-03-16	2006-11-13
2018	2018-01-27	2018-12-14
2019	2019-02-08	2019-11-04
2020	2020-01-20	2020-12-06
2022	2022-01-06	2022-12-31
2023	2023-01-30	2023-12-11
2024	2024-01-08	2024-12-08
2026	2026-03-03	2026-08-10

Every Fixed Threshold

Fixed thresholds at Tootool (Bryntirion)
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	101	30	1974	8
25 mm (0.98 in): Days with 25 mm or more rain	94	11	2022	3
50 mm (1.97 in): Days with 50 mm or more rain	29	3	1934	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1934	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

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Data for Tootool (Bryntirion) 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Tootool (Bryntirion) Threshold Days by Year

Key Facts for Tootool (Bryntirion) Thresholds

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

Every Fixed Threshold

Download the Data

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