Union Threshold Days by Year (USC00238515)

20 fixed thresholds counted per year at Union (USC00238515): 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 88 years, most in 1935 with 47.
Union: days with 25 mm (0.98 in) or more of precipitation in 88 years, most in 2008 with 21.
Union: days with 50 mm (1.97 in) or more of precipitation in 73 years, most in 1993 with 7.
Union: days with a maximum temperature at or above 30 C (86 F) in 69 years, most in 1953 with 115.
20 fixed thresholds have at least one qualifying day at Union.

Days at or above 30 C (86 F)

69 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 115 in 1953.

Days at or above 30 C (86 F) per year at Union
Year	Days	Decade average
1938	104	105.5
1939	107	105.5
1940	98	87
1941	110	87
1942	90	87
1943	91	87
1944	103	87
1945	68	87
1946	77	87
1947	85	87
1948	77	87
1949	71	87
1950	54	84.2
1951	64	84.2
1952	96	84.2
1953	115	84.2
1954	112	84.2
1955	93	84.2
1957	64	84.2
1958	67	84.2
1959	93	84.2
1960	84	78.2
1961	71	78.2
1962	96	78.2
1963	97	78.2
1964	94	78.2
1965	86	78.2
1966	66	78.2
1967	56	78.2
1968	72	78.2
1969	60	78.2
1970	64	82.4
1972	84	82.4
1973	80	82.4
1974	68	82.4
1975	89	82.4
1976	88	82.4
1977	99	82.4
1978	84	82.4
1979	86	82.4
1980	113	92.8
1981	81	92.8
1982	60	92.8
1983	96	92.8
1984	96	92.8
1985	83	92.8
1986	101	92.8
1987	111	92.8
1988	109	92.8
1989	78	92.8
1990	84	80.3
1991	88	80.3
1992	57	80.3
1993	73	80.3
1994	85	80.3
1995	84	80.3
1996	78	80.3
1997	74	80.3
1998	98	80.3
1999	82	80.3
2000	86	82.4
2001	82	82.4
2002	104	82.4
2003	65	82.4
2004	61	82.4
2005	94	82.4
2006	90	82.4
2007	95	82.4
2008	65	82.4

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
1938	1938-03-21	1938-10-17
1939	1939-04-24	1939-10-25
1940	1940-03-31	1940-10-26
1941	1941-04-11	1941-10-06
1942	1942-04-04	1942-10-09
1943	1943-05-02	1943-10-20
1944	1944-04-30	1944-10-14
1945	1945-03-16	1945-09-23
1946	1946-04-01	1946-10-09
1947	1947-04-23	1947-10-22
1948	1948-04-07	1948-09-21
1949	1949-05-03	1949-10-09
1950	1950-04-23	1950-10-31
1951	1951-04-27	1951-10-04
1952	1952-04-29	1952-10-13
1953	1953-04-09	1953-10-22
1954	1954-04-05	1954-10-10
1955	1955-03-10	1955-10-11
1957	1957-04-24	1957-10-01
1958	1958-05-22	1958-10-08
1959	1959-04-07	1959-09-27
1960	1960-04-22	1960-09-24
1961	1961-05-13	1961-10-12
1962	1962-05-05	1962-10-14
1963	1963-03-29	1963-10-22
1964	1964-05-04	1964-10-17
1965	1965-04-11	1965-09-19
1966	1966-05-07	1966-09-05
1967	1967-04-05	1967-10-04
1968	1968-05-01	1968-10-31
1969	1969-05-02	1969-10-04
1970	1970-04-27	1970-09-21
1972	1972-04-06	1972-09-20
1973	1973-05-21	1973-10-08
1974	1974-03-07	1974-09-18
1975	1975-04-27	1975-10-21
1976	1976-04-15	1976-10-12
1977	1977-04-11	1977-10-27
1978	1978-05-24	1978-10-21
1979	1979-04-20	1979-10-21
1980	1980-04-21	1980-10-09
1981	1981-03-31	1981-10-05
1982	1982-05-04	1982-10-05
1983	1983-06-05	1983-10-03
1984	1984-04-25	1984-09-24
1985	1985-03-28	1985-09-22
1986	1986-03-29	1986-09-28
1987	1987-04-19	1987-09-27
1988	1988-03-22	1988-10-17
1989	1989-04-21	1989-11-11
1990	1990-04-23	1990-10-06
1991	1991-03-26	1991-09-16
1992	1992-04-15	1992-10-14
1993	1993-05-05	1993-09-12
1994	1994-04-14	1994-10-01
1995	1995-04-08	1995-10-17
1996	1996-05-08	1996-09-22
1997	1997-03-21	1997-10-11
1998	1998-05-12	1998-09-29
1999	1999-04-02	1999-10-15
2000	2000-04-19	2000-10-03
2001	2001-04-07	2001-09-13
2002	2002-04-15	2002-10-02
2003	2003-04-14	2003-10-20
2004	2004-04-16	2004-09-14
2005	2005-05-10	2005-10-05
2006	2006-04-13	2006-10-04
2007	2007-04-29	2007-10-08
2008	2008-05-30	2008-09-13

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	69	115	1953	65
35 C (95 F): Days	67	68	1954	5
40 C (104 F): Days	23	21	1954	3
45 C (113 F): Days	1	2	1954	2
90 F (32.2 C): Days	69	91	1954	35
100 F (37.8 C): Days	48	39	1954	14
110 F (43.3 C): Days	1	3	1954	3
0 C (32 F): Ice days (max	69	44	1978	13
0 C (32 F): Frost days (min	68	139	1976	117
-10 C (14 F): Days with min	68	46	1978	21
-20 C (-4 F): Days with min	41	13	1979	1
-30 C (-22 F): Days with min	2	2	1977	1
20 C (68 F): Tropical nights (min	68	62	1998	41
25 C (77 F): Days with min	23	5	1980	1
10 mm (0.39 in): Days with 10 mm or more rain	88	47	1935	46
25 mm (0.98 in): Days with 25 mm or more rain	88	21	2008	21
50 mm (1.97 in): Days with 50 mm or more rain	73	7	1993	5
100 mm (3.94 in): Days with 100 mm or more rain	10	2	1957	1
10 cm (3.9 in): Days with 10 cm or more snowfall	46	6	1960	2
25 cm (9.8 in): Days with 25 cm or more snowfall	3	1	1951	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Union Threshold Days by Year (USC00238515)

Key Facts for Union Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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