Wheaton Threshold Days by Year (USC00218907)

21 fixed thresholds counted per year at Wheaton (USC00218907): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Wheaton Thresholds

Wheaton: nights with a minimum temperature at or below 0 C (32 F) in 106 years, most in 2013 with 195.
Wheaton: nights with a minimum temperature at or below -10 C (14 F) in 106 years, most in 1950 with 117.
Wheaton: nights with a minimum temperature at or below -20 C (-4 F) in 106 years, most in 1916 with 58.
Wheaton: days with a maximum temperature at or above 30 C (86 F) in 105 years, most in 1939 with 78.
21 fixed thresholds have at least one qualifying day at Wheaton.

Days at or above 30 C (86 F)

105 years with a qualifying day

Days per year at Wheaton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 78 in 1939.

Days at or above 30 C (86 F) per year at Wheaton
Year	Days	Decade average
1915	16	35.6
1916	40	35.6
1917	40	35.6
1918	33	35.6
1919	49	35.6
1920	34	29.7
1923	42	29.7
1924	7	29.7
1927	25	29.7
1928	24	29.7
1929	46	29.7
1930	56	63.2
1931	57	63.2
1932	57	63.2
1933	71	63.2
1934	73	63.2
1935	43	63.2
1936	75	63.2
1937	67	63.2
1938	55	63.2
1939	78	63.2
1940	62	45.6
1941	54	45.6
1942	10	45.6
1943	48	45.6
1944	40	45.6
1945	39	45.6
1946	38	45.6
1947	59	45.6
1948	57	45.6
1949	49	45.6
1950	26	43.7
1951	16	43.7
1952	66	43.7
1953	44	43.7
1954	39	43.7
1955	57	43.7
1956	25	43.7
1957	38	43.7
1958	48	43.7
1959	78	43.7
1960	49	39.1
1961	48	39.1
1962	19	39.1
1963	39	39.1
1964	50	39.1
1965	17	39.1
1966	54	39.1
1967	31	39.1
1968	41	39.1
1969	43	39.1
1970	60	46.9
1971	42	46.9
1972	37	46.9
1973	39	46.9
1974	49	46.9
1975	47	46.9
1976	74	46.9
1977	41	46.9
1978	49	46.9
1979	31	46.9
1980	59	45.8
1981	25	45.8
1982	40	45.8
1983	58	45.8
1984	42	45.8
1985	37	45.8
1986	34	45.8
1988	71	45.8
1989	46	45.8
1990	43	32.3
1991	41	32.3
1992	22	32.3
1993	11	32.3
1994	26	32.3
1995	34	32.3
1997	36	32.3
1998	45	32.3
1999	33	32.3
2001	44	30.6
2002	59	30.6
2003	43	30.6
2004	21	30.6
2005	26	30.6
2006	25	30.6
2007	31	30.6
2008	13	30.6
2009	13	30.6
2010	26	24.6
2011	25	24.6
2012	42	24.6
2013	29	24.6
2014	11	24.6
2015	23	24.6
2016	25	24.6
2017	22	24.6
2018	29	24.6
2019	14	24.6
2020	28	27.6
2021	39	27.6
2022	24	27.6
2023	39	27.6
2024	16	27.6
2025	19	27.6
2026	28	27.6

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

First to last qualifying date each year at Wheaton
Year	First date	Last date
1915	1915-07-12	1915-09-07
1916	1916-05-06	1916-09-04
1917	1917-05-16	1917-09-24
1918	1918-05-04	1918-09-08
1919	1919-05-27	1919-09-16
1920	1920-05-25	1920-10-07
1923	1923-05-27	1923-09-23
1924	1924-07-15	1924-08-29
1927	1927-06-19	1927-09-16
1928	1928-05-08	1928-10-10
1929	1929-05-25	1929-09-23
1930	1930-05-03	1930-10-11
1931	1931-04-12	1931-10-02
1932	1932-05-13	1932-09-30
1933	1933-05-17	1933-10-14
1934	1934-04-28	1934-10-13
1935	1935-06-13	1935-09-24
1936	1936-05-06	1936-10-08
1937	1937-05-28	1937-10-03
1938	1938-06-05	1938-10-09
1939	1939-05-04	1939-10-05
1940	1940-05-12	1940-09-21
1941	1941-05-13	1941-09-21
1942	1942-06-11	1942-08-30
1943	1943-05-28	1943-09-27
1944	1944-05-23	1944-09-17
1945	1945-06-22	1945-09-07
1946	1946-06-06	1946-09-04
1947	1947-06-26	1947-10-21
1948	1948-05-19	1948-09-19
1949	1949-05-04	1949-09-25
1950	1950-05-23	1950-09-26
1951	1951-07-14	1951-10-01
1952	1952-04-27	1952-09-29
1953	1953-05-29	1953-10-15
1954	1954-06-12	1954-09-02
1955	1955-05-02	1955-10-10
1956	1956-06-05	1956-09-28
1957	1957-05-07	1957-09-02
1958	1958-04-16	1958-10-15
1959	1959-05-01	1959-09-15
1960	1960-05-31	1960-09-07
1961	1961-05-31	1961-10-07
1962	1962-04-24	1962-10-14
1963	1963-05-07	1963-10-06
1964	1964-05-18	1964-09-10
1965	1965-05-13	1965-08-14
1966	1966-05-21	1966-09-13
1967	1967-06-29	1967-09-26
1968	1968-04-30	1968-09-15
1969	1969-05-27	1969-09-15
1970	1970-05-17	1970-10-06
1971	1971-05-14	1971-09-13
1972	1972-05-16	1972-09-20
1973	1973-06-01	1973-08-31
1974	1974-05-21	1974-10-10
1975	1975-06-20	1975-10-04
1976	1976-06-04	1976-10-04
1977	1977-04-09	1977-09-09
1978	1978-05-25	1978-09-12
1979	1979-05-28	1979-09-27
1980	1980-04-20	1980-10-10
1981	1981-06-29	1981-09-13
1982	1982-05-03	1982-09-11
1983	1983-06-10	1983-09-28
1984	1984-05-31	1984-09-22
1985	1985-04-17	1985-09-18
1986	1986-05-29	1986-08-20
1988	1988-05-18	1988-09-19
1989	1989-06-06	1989-10-01
1990	1990-04-22	1990-09-27
1991	1991-05-12	1991-09-03
1992	1992-04-30	1992-10-02
1993	1993-06-11	1993-10-06
1994	1994-05-18	1994-09-15
1995	1995-06-13	1995-10-11
1997	1997-05-18	1997-10-07
1998	1998-05-14	1998-09-18
1999	1999-05-29	1999-09-01
2001	2001-05-14	2001-09-05
2002	2002-04-16	2002-09-17
2003	2003-04-13	2003-10-19
2004	2004-04-28	2004-09-19
2005	2005-06-19	2005-10-02
2006	2006-05-24	2006-09-15
2007	2007-05-14	2007-10-07
2008	2008-06-25	2008-09-02
2009	2009-04-24	2009-08-15
2010	2010-05-25	2010-10-09
2011	2011-05-31	2011-10-06
2012	2012-05-15	2012-10-01
2013	2013-05-14	2013-09-19
2014	2014-05-24	2014-07-22
2015	2015-05-03	2015-10-12
2016	2016-04-15	2016-08-30
2017	2017-06-03	2017-09-23
2018	2018-05-08	2018-09-17
2019	2019-05-31	2019-09-21
2020	2020-06-02	2020-08-24
2021	2021-05-02	2021-09-29
2022	2022-06-13	2022-09-16
2023	2023-05-23	2023-10-03
2024	2024-05-18	2024-09-30
2025	2025-05-12	2025-10-04
2026	2026-04-17	2026-10-11

Every Fixed Threshold

Fixed thresholds at Wheaton
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	105	78	1939	28
35 C (95 F): Days	89	41	1936	2
40 C (104 F): Days	17	13	1936	1
45 C (113 F): Days	1	1	1936	1
90 F (32.2 C): Days	104	61	1936	10
100 F (37.8 C): Days	46	24	1936	1
110 F (43.3 C): Days	2	4	1936	4
0 C (32 F): Ice days (max	105	116	2013	52
0 C (32 F): Frost days (min	106	195	2013	114
-10 C (14 F): Days with min	106	117	1950	44
-20 C (-4 F): Days with min	106	58	1916	17
-30 C (-22 F): Days with min	71	21	1936	3
20 C (68 F): Tropical nights (min	102	30	1929	9
25 C (77 F): Days with min	21	2	1929	1
10 mm (0.39 in): Days with 10 mm or more rain	104	28	1943	9
25 mm (0.98 in): Days with 25 mm or more rain	101	11	2005	4
50 mm (1.97 in): Days with 50 mm or more rain	60	3	1938	1
100 mm (3.94 in): Days with 100 mm or more rain	7	1	1920	1
10 cm (3.9 in): Days with 10 cm or more snowfall	60	7	1997	1
25 cm (9.8 in): Days with 25 cm or more snowfall	14	2	1951	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1997	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1915.

Download the Data

Data for Wheaton 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Wheaton Threshold Days by Year (USC00218907)

Key Facts for Wheaton Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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