Whitehall Threshold Days by Year (USC00309389)

18 fixed thresholds counted per year at Whitehall (USC00309389): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Whitehall Thresholds

Whitehall: days with 10 mm (0.39 in) or more of precipitation in 83 years, most in 2008 with 56.
Whitehall: days with 25 mm (0.98 in) or more of precipitation in 83 years, most in 2006 with 17.
Whitehall: nights with a minimum temperature at or below 0 C (32 F) in 70 years, most in 1972 with 173.
Whitehall: nights with a minimum temperature at or below -10 C (14 F) in 70 years, most in 2008 with 76.
18 fixed thresholds have at least one qualifying day at Whitehall.

Days at or above 30 C (86 F)

66 years with a qualifying day

Days per year at Whitehall with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 62 in 1955.

Days at or above 30 C (86 F) per year at Whitehall
Year	Days	Decade average
1943	50	51.3
1944	56	51.3
1945	50	51.3
1946	41	51.3
1947	58	51.3
1948	46	51.3
1949	58	51.3
1950	31	40
1951	31	40
1952	44	40
1953	58	40
1954	20	40
1955	62	40
1956	39	40
1957	45	40
1958	30	40
1960	33	40.3
1961	48	40.3
1962	36	40.3
1963	33	40.3
1964	51	40.3
1965	46	40.3
1966	55	40.3
1967	37	40.3
1968	32	40.3
1969	32	40.3
1970	39	34.2
1971	37	34.2
1972	20	34.2
1973	56	34.2
1974	23	34.2
1976	25	34.2
1977	32	34.2
1978	41	34.2
1979	35	34.2
1980	38	30.7
1981	26	30.7
1982	24	30.7
1983	50	30.7
1984	30	30.7
1985	19	30.7
1989	28	30.7
1990	32	31.1
1991	46	31.1
1992	15	31.1
1993	33	31.1
1994	22	31.1
1995	44	31.1
1996	17	31.1
1998	28	31.1
1999	43	31.1
2000	14	30
2001	45	30
2002	51	30
2003	33	30
2004	21	30
2005	60	30
2006	7	30
2008	20	30
2009	19	30
2010	48	38
2011	28	38
2012	45	38
2013	31	38
2020	48	40
2021	32	40

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

First to last qualifying date each year at Whitehall
Year	First date	Last date
1943	1943-06-03	1943-09-07
1944	1944-05-04	1944-09-03
1945	1945-05-22	1945-09-10
1946	1946-05-25	1946-09-21
1947	1947-05-29	1947-09-15
1948	1948-06-03	1948-09-30
1949	1949-05-19	1949-10-12
1950	1950-06-08	1950-08-29
1951	1951-05-16	1951-09-14
1952	1952-06-10	1952-09-14
1953	1953-05-10	1953-09-06
1954	1954-04-22	1954-08-26
1955	1955-05-05	1955-08-23
1956	1956-05-22	1956-09-06
1957	1957-04-27	1957-09-23
1958	1958-06-01	1958-09-16
1960	1960-05-27	1960-09-09
1961	1961-05-14	1961-09-25
1962	1962-04-27	1962-09-02
1963	1963-06-03	1963-10-08
1964	1964-05-07	1964-08-31
1965	1965-05-10	1965-09-23
1966	1966-05-27	1966-09-03
1967	1967-06-03	1967-08-19
1968	1968-06-06	1968-08-26
1969	1969-06-03	1969-09-02
1970	1970-05-10	1970-09-23
1971	1971-05-19	1971-09-06
1972	1972-05-29	1972-08-26
1973	1973-06-06	1973-09-06
1974	1974-05-15	1974-08-23
1976	1976-04-17	1976-08-23
1977	1977-05-17	1977-08-30
1978	1978-05-26	1978-08-17
1979	1979-05-09	1979-08-31
1980	1980-05-23	1980-09-02
1981	1981-05-25	1981-08-11
1982	1982-07-06	1982-09-14
1983	1983-06-12	1983-09-21
1984	1984-06-05	1984-08-16
1985	1985-06-23	1985-08-15
1989	1989-05-18	1989-09-11
1990	1990-04-27	1990-09-02
1991	1991-05-12	1991-09-17
1992	1992-05-21	1992-08-27
1993	1993-05-11	1993-09-01
1994	1994-05-22	1994-08-05
1995	1995-06-01	1995-09-06
1996	1996-05-20	1996-08-23
1998	1998-05-16	1998-09-07
1999	1999-05-29	1999-09-06
2000	2000-05-07	2000-09-02
2001	2001-05-02	2001-09-10
2002	2002-04-16	2002-09-11
2003	2003-06-23	2003-08-23
2004	2004-04-19	2004-08-30
2005	2005-05-11	2005-09-15
2006	2006-06-18	2006-08-03
2008	2008-06-07	2008-09-07
2009	2009-04-25	2009-08-20
2010	2010-05-02	2010-09-04
2011	2011-05-26	2011-08-07
2012	2012-04-16	2012-09-01
2013	2013-05-30	2013-09-12
2020	2020-05-27	2020-09-10
2021	2021-05-21	2021-08-31

Every Fixed Threshold

Fixed thresholds at Whitehall
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	66	62	1955	32
35 C (95 F): Days	45	15	1949	1
90 F (32.2 C): Days	64	38	1949	12
100 F (37.8 C): Days	9	2	1949	1
0 C (32 F): Ice days (max	67	98	2008	4
0 C (32 F): Frost days (min	70	173	1972	16
-10 C (14 F): Days with min	70	76	2008	7
-20 C (-4 F): Days with min	67	32	1970	3
-30 C (-22 F): Days with min	39	13	1948	1
20 C (68 F): Tropical nights (min	69	48	2005	18
25 C (77 F): Days with min	6	2	2001	1
10 mm (0.39 in): Days with 10 mm or more rain	83	56	2008	14
25 mm (0.98 in): Days with 25 mm or more rain	83	17	2006	2
50 mm (1.97 in): Days with 50 mm or more rain	49	4	1990	1
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1952	1
10 cm (3.9 in): Days with 10 cm or more snowfall	64	10	1971	3
25 cm (9.8 in): Days with 25 cm or more snowfall	29	5	2003	2
50 cm (19.7 in): Days with 50 cm or more snowfall	4	1	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1943.

Download the Data

Data for Whitehall 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Whitehall Threshold Days by Year (USC00309389)

Key Facts for Whitehall Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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