Trident Threshold Days by Year (USC00248363)

17 fixed thresholds counted per year at Trident (USC00248363): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Trident Thresholds

Trident: nights with a minimum temperature at or below 0 C (32 F) in 88 years, most in 1970 with 205.
Trident: nights with a minimum temperature at or below -10 C (14 F) in 88 years, most in 1985 with 91.
Trident: days with a maximum temperature at or above 30 C (86 F) in 87 years, most in 1988 with 91.
Trident: days with a maximum temperature at or above 90 F (32.2 C) in 87 years, most in 1988 with 72.
17 fixed thresholds have at least one qualifying day at Trident.

Days at or above 30 C (86 F)

87 years with a qualifying day

Days per year at Trident with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 91 in 1988.

Days at or above 30 C (86 F) per year at Trident
Year	Days	Decade average
1924	64	58.2
1925	59	58.2
1926	50	58.2
1927	54	58.2
1928	46	58.2
1929	76	58.2
1930	66	65
1931	66	65
1932	62	65
1933	71	65
1934	63	65
1935	70	65
1936	65	65
1937	69	65
1938	53	65
1939	65	65
1940	75	49.3
1941	44	49.3
1942	49	49.3
1943	52	49.3
1944	43	49.3
1945	52	49.3
1946	43	49.3
1947	47	49.3
1948	38	49.3
1949	50	49.3
1950	36	50.7
1951	34	50.7
1952	47	50.7
1953	62	50.7
1954	52	50.7
1955	61	50.7
1956	54	50.7
1957	54	50.7
1958	51	50.7
1959	56	50.7
1960	47	50
1961	66	50
1962	40	50
1963	54	50
1964	48	50
1965	31	50
1966	68	50
1967	59	50
1968	39	50
1969	48	50
1970	58	42.8
1971	50	42.8
1972	41	42.8
1973	55	42.8
1974	43	42.8
1975	29	42.8
1976	36	42.8
1977	39	42.8
1978	34	42.8
1980	34	57
1981	62	57
1982	43	57
1983	51	57
1984	60	57
1985	50	57
1986	58	57
1987	57	57
1988	91	57
1989	64	57
1990	60	40.2
1991	66	40.2
1992	31	40.2
1993	7	40.2
1994	48	40.2
1995	31	40.2
1996	41	40.2
1997	26	40.2
1998	52	40.2
2002	46	48
2005	50	48
2011	41	40.3
2012	53	40.3
2013	52	40.3
2014	34	40.3
2015	35	40.3
2016	41	40.3
2018	33	40.3
2019	33	40.3
2020	39	53.3
2021	63	53.3
2022	58	53.3

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

First to last qualifying date each year at Trident
Year	First date	Last date
1924	1924-05-12	1924-09-17
1925	1925-05-20	1925-09-04
1926	1926-04-29	1926-10-16
1927	1927-04-27	1927-10-18
1928	1928-05-07	1928-10-10
1929	1929-05-21	1929-10-06
1930	1930-04-08	1930-09-27
1931	1931-05-07	1931-09-07
1932	1932-05-10	1932-09-17
1933	1933-05-30	1933-09-17
1934	1934-05-05	1934-10-12
1935	1935-04-15	1935-10-04
1936	1936-04-18	1936-10-18
1937	1937-05-18	1937-09-21
1938	1938-06-05	1938-09-30
1939	1939-04-28	1939-09-21
1940	1940-05-10	1940-09-12
1941	1941-05-11	1941-08-21
1942	1942-07-02	1942-10-09
1943	1943-05-27	1943-10-03
1944	1944-05-15	1944-09-14
1945	1945-06-20	1945-09-13
1946	1946-06-09	1946-09-15
1947	1947-05-02	1947-09-05
1948	1948-05-17	1948-09-15
1949	1949-05-11	1949-09-23
1950	1950-06-05	1950-09-07
1951	1951-06-15	1951-09-07
1952	1952-06-05	1952-09-27
1953	1953-06-11	1953-09-16
1954	1954-05-18	1954-09-26
1955	1955-06-20	1955-09-14
1956	1956-05-23	1956-09-26
1957	1957-06-03	1957-10-01
1958	1958-05-20	1958-09-11
1959	1959-06-03	1959-09-13
1960	1960-05-11	1960-09-19
1961	1961-05-29	1961-08-29
1962	1962-04-19	1962-09-06
1963	1963-06-13	1963-09-30
1964	1964-05-19	1964-08-19
1965	1965-06-11	1965-08-18
1966	1966-05-04	1966-09-23
1967	1967-05-21	1967-09-29
1968	1968-06-02	1968-09-10
1969	1969-05-24	1969-09-09
1970	1970-06-03	1970-08-28
1971	1971-05-27	1971-09-11
1972	1972-05-16	1972-08-29
1973	1973-05-16	1973-08-30
1974	1974-06-11	1974-09-09
1975	1975-06-30	1975-09-07
1976	1976-06-08	1976-09-05
1977	1977-04-25	1977-09-07
1978	1978-06-08	1978-09-27
1980	1980-05-21	1980-09-06
1981	1981-06-23	1981-09-18
1982	1982-06-12	1982-09-10
1983	1983-05-25	1983-09-02
1984	1984-05-29	1984-09-19
1985	1985-05-22	1985-08-30
1986	1986-05-26	1986-08-29
1987	1987-04-28	1987-10-03
1988	1988-05-12	1988-09-09
1989	1989-05-06	1989-09-29
1990	1990-05-06	1990-09-25
1991	1991-06-10	1991-09-06
1992	1992-04-29	1992-10-01
1993	1993-06-20	1993-09-10
1994	1994-06-20	1994-09-25
1995	1995-06-13	1995-09-03
1996	1996-06-07	1996-09-04
1997	1997-06-04	1997-10-01
1998	1998-07-09	1998-09-18
2002	2002-05-20	2002-09-16
2005	2005-06-20	2005-09-09
2011	2011-06-28	2011-10-01
2012	2012-06-04	2012-09-14
2013	2013-05-12	2013-09-06
2014	2014-05-28	2014-09-25
2015	2015-06-08	2015-10-10
2016	2016-06-05	2016-09-01
2018	2018-06-09	2018-09-07
2019	2019-06-06	2019-09-16
2020	2020-05-31	2020-09-14
2021	2021-06-02	2021-09-27
2022	2022-06-16	2022-09-07

Every Fixed Threshold

Fixed thresholds at Trident
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	87	91	1988	58
35 C (95 F): Days	81	28	1924	15
40 C (104 F): Days	10	2	1931	1
90 F (32.2 C): Days	87	72	1988	41
100 F (37.8 C): Days	36	6	1924	1
0 C (32 F): Ice days (max	87	67	1955	61
0 C (32 F): Frost days (min	88	205	1970	174
-10 C (14 F): Days with min	88	91	1985	78
-20 C (-4 F): Days with min	86	36	1949	23
-30 C (-22 F): Days with min	51	12	1924	3
-40 C (-40 F): Days with min	3	1	1927	1
20 C (68 F): Tropical nights (min	9	5	1930	1
10 mm (0.39 in): Days with 10 mm or more rain	78	17	2014	6
25 mm (0.98 in): Days with 25 mm or more rain	34	4	1976	1
50 mm (1.97 in): Days with 50 mm or more rain	2	1	1980	1
10 cm (3.9 in): Days with 10 cm or more snowfall	40	6	1982	2
25 cm (9.8 in): Days with 25 cm or more snowfall	6	2	1957	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.

Download the Data

Data for Trident 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).

Trident Threshold Days by Year (USC00248363)

Key Facts for Trident Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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