Clarkson Threshold Days by Year (USC00251660)

19 fixed thresholds counted per year at Clarkson (USC00251660): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Clarkson Thresholds

Clarkson: days with a maximum temperature at or above 30 C (86 F) in 62 years, most in 1956 with 80.
Clarkson: days with a maximum temperature at or above 90 F (32.2 C) in 62 years, most in 1955 with 60.
Clarkson: days with a maximum temperature at or below 0 C (32 F) in 62 years, most in 1978 with 74.
Clarkson: days with 10 mm (0.39 in) or more of precipitation in 62 years, most in 1984 with 38.
19 fixed thresholds have at least one qualifying day at Clarkson.

Days at or above 30 C (86 F)

62 years with a qualifying day

Days per year at Clarkson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1956.

Days at or above 30 C (86 F) per year at Clarkson
Year	Days	Decade average
1941	79	66.1
1942	63	66.1
1943	74	66.1
1944	70	66.1
1945	59	66.1
1946	60	66.1
1947	58	66.1
1949	66	66.1
1950	40	58.4
1951	37	58.4
1952	70	58.4
1953	70	58.4
1954	68	58.4
1955	72	58.4
1956	80	58.4
1957	49	58.4
1958	41	58.4
1959	57	58.4
1960	40	57.3
1961	67	57.3
1962	63	57.3
1963	78	57.3
1964	62	57.3
1965	53	57.3
1966	49	57.3
1967	46	57.3
1968	65	57.3
1969	50	57.3
1970	73	64.6
1971	55	64.6
1972	72	64.6
1973	69	64.6
1974	57	64.6
1975	68	64.6
1976	76	64.6
1977	50	64.6
1978	72	64.6
1979	54	64.6
1980	75	57.2
1981	49	57.2
1982	31	57.2
1983	79	57.2
1984	57	57.2
1985	43	57.2
1986	43	57.2
1987	66	57.2
1988	76	57.2
1989	53	57.2
1990	58	45.8
1991	68	45.8
1992	17	45.8
1993	28	45.8
1994	47	45.8
1995	53	45.8
1996	33	45.8
1997	51	45.8
1998	60	45.8
1999	43	45.8
2000	59	56.8
2001	52	56.8
2002	69	56.8
2003	47	56.8

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

First to last qualifying date each year at Clarkson
Year	First date	Last date
1941	1941-05-14	1941-09-21
1942	1942-05-26	1942-09-30
1943	1943-03-30	1943-10-10
1944	1944-05-14	1944-09-15
1945	1945-05-25	1945-10-18
1946	1946-04-19	1946-09-26
1947	1947-06-26	1947-10-20
1949	1949-04-25	1949-10-07
1950	1950-04-22	1950-10-30
1951	1951-06-16	1951-10-02
1952	1952-05-03	1952-09-30
1953	1953-05-24	1953-10-02
1954	1954-04-14	1954-09-27
1955	1955-04-19	1955-09-18
1956	1956-05-12	1956-10-12
1957	1957-06-03	1957-09-01
1958	1958-05-11	1958-10-15
1959	1959-05-01	1959-09-09
1960	1960-04-22	1960-09-07
1961	1961-05-28	1961-10-17
1962	1962-04-21	1962-10-11
1963	1963-05-29	1963-10-06
1964	1964-04-16	1964-08-19
1965	1965-04-22	1965-08-28
1966	1966-05-05	1966-10-08
1967	1967-04-29	1967-10-02
1968	1968-03-30	1968-09-13
1969	1969-05-15	1969-10-03
1970	1970-04-29	1970-09-20
1971	1971-06-05	1971-10-01
1972	1972-04-06	1972-09-20
1973	1973-05-18	1973-09-02
1974	1974-05-20	1974-10-10
1975	1975-05-17	1975-10-13
1976	1976-05-19	1976-10-01
1977	1977-04-27	1977-09-10
1978	1978-03-31	1978-10-20
1979	1979-05-17	1979-09-29
1980	1980-04-20	1980-10-09
1981	1981-04-25	1981-09-29
1982	1982-06-06	1982-09-10
1983	1983-05-24	1983-09-27
1984	1984-06-05	1984-09-19
1985	1985-04-17	1985-09-18
1986	1986-03-28	1986-09-03
1987	1987-04-19	1987-09-26
1988	1988-04-08	1988-09-26
1989	1989-04-21	1989-09-07
1990	1990-04-23	1990-10-06
1991	1991-04-06	1991-09-30
1992	1992-05-01	1992-09-18
1993	1993-05-14	1993-10-07
1994	1994-04-18	1994-09-15
1995	1995-06-07	1995-09-14
1996	1996-04-12	1996-09-11
1997	1997-05-16	1997-10-07
1998	1998-05-05	1998-09-30
1999	1999-06-05	1999-09-24
2000	2000-05-05	2000-10-02
2001	2001-04-27	2001-09-05
2002	2002-04-16	2002-09-10
2003	2003-04-02	2003-09-07

Every Fixed Threshold

Fixed thresholds at Clarkson
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	62	80	1956	47
35 C (95 F): Days	59	37	1941	9
40 C (104 F): Days	14	5	1954	1
90 F (32.2 C): Days	62	60	1955	21
100 F (37.8 C): Days	33	15	1974	2
110 F (43.3 C): Days	1	1	1954	1
0 C (32 F): Ice days (max	62	74	1978	48
0 C (32 F): Frost days (min	60	169	1970	152
-10 C (14 F): Days with min	60	83	1978	53
-20 C (-4 F): Days with min	59	30	1978	5
-30 C (-22 F): Days with min	17	4	1989	2
20 C (68 F): Tropical nights (min	60	40	1983	16
25 C (77 F): Days with min	21	9	1941	1
10 mm (0.39 in): Days with 10 mm or more rain	62	38	1984	26
25 mm (0.98 in): Days with 25 mm or more rain	62	14	1977	5
50 mm (1.97 in): Days with 50 mm or more rain	45	5	1965	3
100 mm (3.94 in): Days with 100 mm or more rain	8	1	1944	1
10 cm (3.9 in): Days with 10 cm or more snowfall	40	8	1975	3
25 cm (9.8 in): Days with 25 cm or more snowfall	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 1941.

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Data for Clarkson 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).

Clarkson Threshold Days by Year (USC00251660)

Key Facts for Clarkson Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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