Harlem Threshold Days by Year (USC00243929)

18 fixed thresholds counted per year at Harlem (USC00243929): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harlem Thresholds

Harlem: days with 10 mm (0.39 in) or more of precipitation in 71 years, most in 1938 with 17.
Harlem: nights with a minimum temperature at or below 0 C (32 F) in 69 years, most in 1935 with 216.
Harlem: nights with a minimum temperature at or below -10 C (14 F) in 69 years, most in 1955 with 123.
Harlem: nights with a minimum temperature at or below -20 C (-4 F) in 69 years, most in 1936 with 67.
18 fixed thresholds have at least one qualifying day at Harlem.

Days at or above 30 C (86 F)

57 years with a qualifying day

Days per year at Harlem with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 72 in 1961.

Days at or above 30 C (86 F) per year at Harlem
Year	Days	Decade average
1924	26	26
1930	50	45.7
1931	49	45.7
1932	33	45.7
1934	41	45.7
1935	41	45.7
1936	61	45.7
1937	37	45.7
1938	48	45.7
1939	51	45.7
1940	52	45
1941	52	45
1942	37	45
1943	48	45
1944	32	45
1945	47	45
1946	36	45
1947	44	45
1949	57	45
1950	33	39.3
1952	39	39.3
1953	54	39.3
1954	35	39.3
1955	37	39.3
1956	35	39.3
1957	39	39.3
1958	46	39.3
1959	36	39.3
1960	51	47.8
1961	72	47.8
1962	37	47.8
1963	55	47.8
1964	43	47.8
1965	33	47.8
1966	57	47.8
1967	62	47.8
1968	36	47.8
1969	32	47.8
1970	57	42.3
1971	46	42.3
1972	39	42.3
1975	27	42.3
1981	51	45.2
1982	29	45.2
1983	50	45.2
1984	66	45.2
1985	35	45.2
1986	40	45.2
1990	53	43.3
1991	55	43.3
1992	36	43.3
1993	18	43.3
1994	57	43.3
1995	39	43.3
1996	46	43.3
1999	42	43.3
2008	43	43

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

First to last qualifying date each year at Harlem
Year	First date	Last date
1924	1924-05-15	1924-10-26
1930	1930-06-07	1930-09-03
1931	1931-05-13	1931-09-27
1932	1932-05-12	1932-09-07
1934	1934-05-14	1934-08-28
1935	1935-06-22	1935-09-22
1936	1936-05-04	1936-09-21
1937	1937-06-02	1937-09-18
1938	1938-05-27	1938-09-24
1939	1939-04-28	1939-09-21
1940	1940-06-11	1940-09-13
1941	1941-05-11	1941-08-23
1942	1942-04-21	1942-10-10
1943	1943-07-03	1943-10-05
1944	1944-05-13	1944-09-07
1945	1945-05-30	1945-09-13
1946	1946-06-03	1946-09-14
1947	1947-05-02	1947-09-12
1949	1949-04-28	1949-09-11
1950	1950-05-28	1950-09-07
1952	1952-04-19	1952-09-29
1953	1953-05-06	1953-10-10
1954	1954-05-19	1954-08-30
1955	1955-06-14	1955-10-10
1956	1956-05-19	1956-09-26
1957	1957-05-02	1957-10-01
1958	1958-05-11	1958-10-18
1959	1959-06-02	1959-09-13
1960	1960-05-11	1960-10-06
1961	1961-05-21	1961-10-16
1962	1962-04-19	1962-09-27
1963	1963-05-30	1963-10-03
1964	1964-05-19	1964-10-13
1965	1965-06-10	1965-08-22
1966	1966-05-06	1966-09-23
1967	1967-05-28	1967-09-29
1968	1968-04-30	1968-09-11
1969	1969-05-26	1969-09-13
1970	1970-06-03	1970-10-04
1971	1971-05-13	1971-09-10
1972	1972-05-17	1972-08-30
1975	1975-06-24	1975-10-03
1981	1981-05-02	1981-09-20
1982	1982-06-22	1982-09-10
1983	1983-05-25	1983-09-26
1984	1984-05-14	1984-09-17
1985	1985-06-07	1985-08-30
1986	1986-05-20	1986-08-30
1990	1990-06-18	1990-09-25
1991	1991-05-07	1991-10-11
1992	1992-04-29	1992-10-03
1993	1993-05-11	1993-09-11
1994	1994-05-27	1994-09-25
1995	1995-05-30	1995-09-14
1996	1996-06-07	1996-08-31
1999	1999-05-24	1999-09-23
2008	2008-05-17	2008-08-30

Every Fixed Threshold

Fixed thresholds at Harlem
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	57	72	1961	43
35 C (95 F): Days	57	31	1936	10
40 C (104 F): Days	15	4	1936	1
90 F (32.2 C): Days	57	60	1961	27
100 F (37.8 C): Days	39	16	1936	4
0 C (32 F): Ice days (max	57	96	1955	45
0 C (32 F): Frost days (min	69	216	1935	198
-10 C (14 F): Days with min	69	123	1955	88
-20 C (-4 F): Days with min	69	67	1936	36
-30 C (-22 F): Days with min	65	28	1936	6
-40 C (-40 F): Days with min	13	7	1950	1
20 C (68 F): Tropical nights (min	18	2	1939	3
10 mm (0.39 in): Days with 10 mm or more rain	71	17	1938	7
25 mm (0.98 in): Days with 25 mm or more rain	46	6	1932	3
50 mm (1.97 in): Days with 50 mm or more rain	10	1	1937	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1986	1
10 cm (3.9 in): Days with 10 cm or more snowfall	38	9	1950	2
25 cm (9.8 in): Days with 25 cm or more snowfall	7	1	1935	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 Harlem 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).

Harlem Threshold Days by Year (USC00243929)

Key Facts for Harlem Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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