Union Threshold Days by Year (USC00358746)

15 fixed thresholds counted per year at Union (USC00358746): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Union Thresholds

Union: days with 10 mm (0.39 in) or more of precipitation in 103 years, most in 1995 with 16.
Union: days with a maximum temperature at or above 30 C (86 F) in 98 years, most in 2001 with 66.
Union: days with a maximum temperature at or above 90 F (32.2 C) in 98 years, most in 2006 with 45.
Union: days with a maximum temperature at or below 0 C (32 F) in 98 years, most in 1985 with 66.
15 fixed thresholds have at least one qualifying day at Union.

Days at or above 30 C (86 F)

98 years with a qualifying day

Days per year at Union with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 2001.

Days at or above 30 C (86 F) per year at Union
Year	Days	Decade average
1912	12	34
1913	22	34
1914	34	34
1915	42	34
1916	27	34
1917	48	34
1918	39	34
1919	48	34
1920	31	37.3
1921	30	37.3
1922	53	37.3
1923	39	37.3
1924	31	37.3
1925	45	37.3
1926	34	37.3
1927	30	37.3
1928	38	37.3
1929	42	37.3
1930	30	38.2
1931	47	38.2
1932	29	38.2
1933	32	38.2
1934	45	38.2
1935	38	38.2
1936	46	38.2
1937	32	38.2
1938	45	38.2
1939	38	38.2
1940	48	36.7
1941	29	36.7
1942	36	36.7
1943	37	36.7
1944	34	36.7
1945	56	36.7
1946	26	36.7
1947	35	36.7
1948	26	36.7
1949	40	36.7
1950	40	35.6
1951	39	35.6
1952	45	35.6
1953	30	35.6
1954	21	35.6
1955	43	35.6
1956	34	35.6
1957	23	35.6
1958	47	35.6
1959	34	35.6
1960	37	36.8
1961	52	36.8
1962	29	36.8
1963	37	36.8
1964	22	36.8
1965	24	36.8
1966	39	36.8
1967	61	36.8
1968	37	36.8
1969	30	36.8
1970	45	38.7
1971	44	38.7
1972	32	38.7
1973	49	38.7
1974	40	38.7
1975	21	38.7
1976	30	38.7
1977	47	38.7
1978	33	38.7
1979	46	38.7
1980	24	38.3
1981	40	38.3
1982	30	38.3
1983	35	38.3
1984	41	38.3
1985	39	38.3
1986	48	38.3
1987	50	38.3
1988	50	38.3
1989	26	38.3
1990	55	42.1
1991	45	42.1
1992	46	42.1
1993	18	42.1
1994	52	42.1
1995	39	42.1
1996	46	42.1
1997	29	42.1
1999	49	42.1
2000	43	51.7
2001	66	51.7
2002	50	51.7
2003	62	51.7
2004	35	51.7
2005	51	51.7
2006	58	51.7
2007	62	51.7
2008	32	51.7
2009	58	51.7
2010	36	36

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

First to last qualifying date each year at Union
Year	First date	Last date
1912	1912-06-23	1912-08-24
1913	1913-05-26	1913-09-28
1914	1914-06-16	1914-09-02
1915	1915-06-23	1915-09-18
1916	1916-06-15	1916-09-01
1917	1917-06-14	1917-09-20
1918	1918-05-03	1918-09-20
1919	1919-05-18	1919-09-16
1920	1920-06-21	1920-09-02
1921	1921-06-21	1921-08-30
1922	1922-06-01	1922-09-19
1923	1923-05-08	1923-09-14
1924	1924-05-09	1924-08-27
1925	1925-06-18	1925-09-02
1926	1926-04-28	1926-08-24
1927	1927-06-21	1927-08-23
1928	1928-05-06	1928-09-29
1929	1929-05-21	1929-09-17
1930	1930-06-15	1930-09-03
1931	1931-05-12	1931-09-05
1932	1932-06-22	1932-09-07
1933	1933-06-14	1933-09-04
1934	1934-05-22	1934-09-17
1935	1935-06-07	1935-09-21
1936	1936-04-17	1936-09-21
1937	1937-06-28	1937-09-15
1938	1938-06-04	1938-09-23
1939	1939-05-14	1939-09-20
1940	1940-05-10	1940-09-11
1941	1941-05-23	1941-08-22
1942	1942-06-30	1942-09-04
1943	1943-07-05	1943-10-02
1944	1944-06-29	1944-09-12
1945	1945-06-18	1945-09-14
1946	1946-06-13	1946-09-13
1947	1947-05-06	1947-09-25
1948	1948-05-27	1948-09-14
1949	1949-05-11	1949-09-27
1950	1950-06-28	1950-09-03
1951	1951-06-30	1951-09-16
1952	1952-06-09	1952-10-02
1953	1953-07-06	1953-09-15
1954	1954-05-18	1954-09-10
1955	1955-06-09	1955-09-07
1956	1956-05-17	1956-09-15
1957	1957-06-02	1957-09-26
1958	1958-05-19	1958-09-11
1959	1959-06-03	1959-09-13
1960	1960-06-25	1960-09-20
1961	1961-05-26	1961-08-29
1962	1962-06-25	1962-09-27
1963	1963-06-16	1963-09-30
1964	1964-05-17	1964-08-24
1965	1965-06-11	1965-08-19
1966	1966-05-04	1966-09-23
1967	1967-05-22	1967-09-29
1968	1968-06-17	1968-09-11
1969	1969-06-05	1969-09-13
1970	1970-06-03	1970-09-01
1971	1971-06-23	1971-09-11
1972	1972-05-29	1972-09-05
1973	1973-05-16	1973-09-12
1974	1974-06-12	1974-09-26
1975	1975-07-04	1975-09-07
1976	1976-05-14	1976-10-01
1977	1977-04-24	1977-09-14
1978	1978-06-06	1978-09-27
1979	1979-05-23	1979-09-21
1980	1980-07-09	1980-09-10
1981	1981-07-04	1981-09-19
1982	1982-06-18	1982-09-03
1983	1983-05-24	1983-09-01
1984	1984-05-30	1984-09-19
1985	1985-05-24	1985-08-30
1986	1986-05-27	1986-09-08
1987	1987-04-28	1987-10-03
1988	1988-05-13	1988-10-06
1989	1989-06-30	1989-09-30
1990	1990-06-23	1990-09-26
1991	1991-06-11	1991-09-28
1992	1992-05-07	1992-10-03
1993	1993-05-13	1993-09-11
1994	1994-06-22	1994-09-27
1995	1995-06-25	1995-09-18
1996	1996-06-08	1996-09-29
1997	1997-06-26	1997-09-10
1999	1999-05-25	1999-09-24
2000	2000-06-05	2000-09-15
2001	2001-05-13	2001-10-02
2002	2002-06-14	2002-09-16
2003	2003-05-25	2003-10-05
2004	2004-06-23	2004-09-01
2005	2005-05-29	2005-09-30
2006	2006-05-16	2006-09-13
2007	2007-06-02	2007-09-14
2008	2008-05-17	2008-10-02
2009	2009-05-18	2009-09-29
2010	2010-06-29	2010-10-04

Every Fixed Threshold

Fixed thresholds at Union
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	98	66	2001	36
35 C (95 F): Days	91	23	2003	4
40 C (104 F): Days	6	2	2002	1
90 F (32.2 C): Days	98	45	2006	17
100 F (37.8 C): Days	35	7	2003	2
0 C (32 F): Ice days (max	98	66	1985	4
0 C (32 F): Frost days (min	97	179	1916	147
-10 C (14 F): Days with min	96	46	1985	23
-20 C (-4 F): Days with min	52	10	1949	2
-30 C (-22 F): Days with min	5	1	1919	1
20 C (68 F): Tropical nights (min	6	1	1922	1
10 mm (0.39 in): Days with 10 mm or more rain	103	16	1995	6
25 mm (0.98 in): Days with 25 mm or more rain	43	2	1920	2
10 cm (3.9 in): Days with 10 cm or more snowfall	53	6	1929	1
25 cm (9.8 in): Days with 25 cm or more snowfall	5	2	1921	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

Data for Union 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).

Union Threshold Days by Year (USC00358746)

Key Facts for Union Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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