Holtwood Threshold Days by Year

18 fixed thresholds counted per year at Holtwood (USC00364019): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Holtwood Thresholds

Holtwood: days with 10 mm (0.39 in) or more of precipitation in 80 years, most in 1975 with 44.
Holtwood: days with 25 mm (0.98 in) or more of precipitation in 80 years, most in 1971 with 16.
Holtwood: days with a maximum temperature at or above 30 C (86 F) in 76 years, most in 1930 with 89.
Holtwood: days with a maximum temperature at or above 90 F (32.2 C) in 76 years, most in 1930 with 60.
18 fixed thresholds have at least one qualifying day at Holtwood.

Days at or above 30 C (86 F)

76 years with a qualifying day

Days per year at Holtwood with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 89 in 1930.

Days at or above 30 C (86 F) per year at Holtwood
Year	Days	Decade average
1920	54	38.5
1921	59	38.5
1922	42	38.5
1923	34	38.5
1924	18	38.5
1925	37	38.5
1926	27	38.5
1927	18	38.5
1928	27	38.5
1929	69	38.5
1930	89	59.1
1931	88	59.1
1932	81	59.1
1933	43	59.1
1934	46	59.1
1935	42	59.1
1936	50	59.1
1937	49	59.1
1938	53	59.1
1939	50	59.1
1940	36	46.8
1941	63	46.8
1942	38	46.8
1943	55	46.8
1944	62	46.8
1945	42	46.8
1946	30	46.8
1947	37	46.8
1949	58	46.8
1950	26	44.5
1951	47	44.5
1952	53	44.5
1953	52	44.5
1954	41	44.5
1955	57	44.5
1956	39	44.5
1957	51	44.5
1958	31	44.5
1959	48	44.5
1960	29	37.9
1961	48	37.9
1962	29	37.9
1963	32	37.9
1964	44	37.9
1965	43	37.9
1966	53	37.9
1967	26	37.9
1968	42	37.9
1969	33	37.9
1970	41	34
1971	30	34
1972	24	34
1974	33	34
1975	37	34
1976	30	34
1977	45	34
1978	39	34
1979	27	34
1980	56	32.6
1981	26	32.6
1982	25	32.6
1983	33	32.6
1984	29	32.6
1985	37	32.6
1986	24	32.6
1987	37	32.6
1988	35	32.6
1989	24	32.6
1990	37	41.8
1991	70	41.8
1992	23	41.8
1993	51	41.8
1994	40	41.8
1995	50	41.8
1996	25	41.8
1997	38	41.8

For each year, a bar from the first to the last day at Holtwood meeting 30 C (86 F).

First to last qualifying date each year at Holtwood
Year	First date	Last date
1920	1920-05-29	1920-09-18
1921	1921-03-27	1921-09-29
1922	1922-04-09	1922-10-03
1923	1923-06-02	1923-09-09
1924	1924-07-13	1924-09-02
1925	1925-05-23	1925-09-13
1926	1926-06-14	1926-09-25
1927	1927-06-11	1927-10-03
1928	1928-05-05	1928-09-14
1929	1929-04-07	1929-09-27
1930	1930-05-02	1930-10-14
1931	1931-05-17	1931-10-09
1932	1932-05-08	1932-09-24
1933	1933-05-20	1933-09-09
1934	1934-05-06	1934-08-24
1935	1935-05-29	1935-08-22
1936	1936-05-08	1936-09-16
1937	1937-04-18	1937-09-04
1938	1938-06-07	1938-09-15
1939	1939-05-27	1939-10-10
1940	1940-05-14	1940-09-21
1941	1941-04-20	1941-10-07
1942	1942-04-30	1942-09-19
1943	1943-05-08	1943-09-06
1944	1944-05-13	1944-09-04
1945	1945-06-11	1945-09-29
1946	1946-06-08	1946-09-19
1947	1947-05-18	1947-10-23
1949	1949-05-06	1949-10-11
1950	1950-06-07	1950-09-01
1951	1951-05-15	1951-09-13
1952	1952-06-06	1952-09-14
1953	1953-05-11	1953-09-29
1954	1954-05-31	1954-09-30
1955	1955-05-21	1955-09-15
1956	1956-05-14	1956-09-23
1957	1957-04-27	1957-09-22
1958	1958-06-11	1958-09-26
1959	1959-05-07	1959-10-06
1960	1960-04-23	1960-09-01
1961	1961-06-02	1961-09-24
1962	1962-05-15	1962-09-10
1963	1963-05-09	1963-10-27
1964	1964-05-19	1964-09-11
1965	1965-05-03	1965-09-23
1966	1966-06-04	1966-09-03
1967	1967-06-09	1967-08-19
1968	1968-06-06	1968-09-24
1969	1969-05-29	1969-09-17
1970	1970-05-09	1970-09-26
1971	1971-06-06	1971-09-15
1972	1972-07-02	1972-09-26
1974	1974-04-29	1974-09-13
1975	1975-05-21	1975-08-27
1976	1976-04-17	1976-09-14
1977	1977-04-22	1977-09-18
1978	1978-05-20	1978-09-18
1979	1979-05-09	1979-09-04
1980	1980-06-01	1980-09-22
1981	1981-06-15	1981-09-14
1982	1982-06-16	1982-09-02
1983	1983-06-15	1983-09-20
1984	1984-05-22	1984-09-03
1985	1985-04-22	1985-09-20
1986	1986-05-06	1986-09-30
1987	1987-05-18	1987-08-18
1988	1988-06-13	1988-08-17
1989	1989-06-01	1989-09-10
1990	1990-04-26	1990-09-06
1991	1991-05-14	1991-09-17
1992	1992-05-02	1992-09-23
1993	1993-05-11	1993-09-15
1994	1994-04-25	1994-09-17
1995	1995-05-24	1995-10-06
1996	1996-05-19	1996-09-08
1997	1997-05-19	1997-09-07

Every Fixed Threshold

Fixed thresholds at Holtwood
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	76	89	1930	38
35 C (95 F): Days	53	26	1931	5
40 C (104 F): Days	2	2	1931	2
90 F (32.2 C): Days	76	60	1930	18
100 F (37.8 C): Days	8	11	1931	1
0 C (32 F): Ice days (max	76	37	1978	11
0 C (32 F): Frost days (min	76	126	1995	120
-10 C (14 F): Days with min	72	29	1963	7
-20 C (-4 F): Days with min	8	2	1985	2
20 C (68 F): Tropical nights (min	76	82	1934	15
25 C (77 F): Days with min	31	12	1934	1
10 mm (0.39 in): Days with 10 mm or more rain	80	44	1975	22
25 mm (0.98 in): Days with 25 mm or more rain	80	16	1971	5
50 mm (1.97 in): Days with 50 mm or more rain	58	5	1915	3
100 mm (3.94 in): Days with 100 mm or more rain	7	1	1916	1
10 cm (3.9 in): Days with 10 cm or more snowfall	37	8	1966	3
25 cm (9.8 in): Days with 25 cm or more snowfall	11	3	1964	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	2	1958	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1920.

Download the Data

Data for Holtwood 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Holtwood Threshold Days by Year

Key Facts for Holtwood Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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