Mutual Threshold Days by Year (USC00346139)

20 fixed thresholds counted per year at Mutual (USC00346139): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mutual Thresholds

Mutual: days with 10 mm (0.39 in) or more of precipitation in 99 years, most in 1941 with 40.
Mutual: days with 25 mm (0.98 in) or more of precipitation in 99 years, most in 1941 with 18.
Mutual: nights with a minimum temperature at or below 0 C (32 F) in 92 years, most in 2013 with 138.
Mutual: nights with a minimum temperature at or below -10 C (14 F) in 92 years, most in 1978 with 37.
20 fixed thresholds have at least one qualifying day at Mutual.

Days at or above 30 C (86 F)

91 years with a qualifying day

Days per year at Mutual with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 147 in 1956.

Days at or above 30 C (86 F) per year at Mutual
Year	Days	Decade average
1915	62	107.2
1916	131	107.2
1917	112	107.2
1918	127	107.2
1919	104	107.2
1920	97	107.4
1921	130	107.4
1922	118	107.4
1924	105	107.4
1926	105	107.4
1927	109	107.4
1928	90	107.4
1929	105	107.4
1935	116	122.3
1936	129	122.3
1938	108	122.3
1939	136	122.3
1940	123	101
1941	87	101
1942	99	101
1944	106	101
1945	100	101
1946	103	101
1947	89	101
1951	98	120.5
1952	126	120.5
1953	126	120.5
1954	132	120.5
1955	125	120.5
1956	147	120.5
1957	95	120.5
1958	115	120.5
1960	109	105.1
1961	99	105.1
1962	120	105.1
1964	96	105.1
1965	105	105.1
1966	107	105.1
1967	102	105.1
1969	103	105.1
1970	126	105.9
1971	130	105.9
1972	124	105.9
1973	96	105.9
1974	78	105.9
1976	93	105.9
1977	102	105.9
1978	108	105.9
1979	96	105.9
1980	120	98
1981	103	98
1982	85	98
1983	95	98
1984	109	98
1985	92	98
1986	98	98
1987	93	98
1988	96	98
1989	89	98
1990	102	99.2
1991	105	99.2
1992	85	99.2
1993	94	99.2
1994	115	99.2
1995	92	99.2
1996	88	99.2
1997	88	99.2
1998	131	99.2
1999	92	99.2
2000	117	102
2001	108	102
2002	103	102
2003	98	102
2004	93	102
2005	112	102
2006	112	102
2007	89	102
2008	96	102
2009	92	102
2010	123	108.4
2011	127	108.4
2012	128	108.4
2013	101	108.4
2014	101	108.4
2015	101	108.4
2016	105	108.4
2017	94	108.4
2018	109	108.4
2019	95	108.4
2020	106	99
2021	92	99

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

First to last qualifying date each year at Mutual
Year	First date	Last date
1915	1915-05-12	1915-11-07
1916	1916-03-05	1916-11-04
1917	1917-03-10	1917-10-17
1918	1918-02-23	1918-10-08
1919	1919-06-18	1919-10-25
1920	1920-04-15	1920-10-12
1921	1921-04-23	1921-10-24
1922	1922-04-21	1922-10-27
1924	1924-04-15	1924-10-04
1926	1926-05-16	1926-10-17
1927	1927-04-08	1927-10-27
1928	1928-05-21	1928-10-10
1929	1929-03-23	1929-10-06
1935	1935-02-21	1935-10-16
1936	1936-04-12	1936-10-19
1938	1938-05-29	1938-10-28
1939	1939-05-02	1939-10-26
1940	1940-03-31	1940-10-25
1941	1941-05-14	1941-10-13
1942	1942-04-04	1942-09-23
1944	1944-05-12	1944-10-25
1945	1945-05-06	1945-11-05
1946	1946-03-31	1946-09-26
1947	1947-05-03	1947-10-21
1951	1951-03-22	1951-10-05
1952	1952-04-07	1952-11-01
1953	1953-03-20	1953-10-12
1954	1954-02-14	1954-10-18
1955	1955-03-03	1955-12-24
1956	1956-03-05	1956-10-12
1957	1957-06-06	1957-10-05
1958	1958-04-23	1958-10-20
1960	1960-04-16	1960-10-10
1961	1961-04-20	1961-10-12
1962	1962-02-11	1962-10-14
1964	1964-04-20	1964-10-21
1965	1965-04-17	1965-10-10
1966	1966-03-31	1966-10-13
1967	1967-03-11	1967-10-06
1969	1969-05-19	1969-10-03
1970	1970-04-27	1970-10-04
1971	1971-03-13	1971-10-12
1972	1972-03-26	1972-10-17
1973	1973-05-18	1973-10-24
1974	1974-04-01	1974-09-12
1976	1976-03-20	1976-10-12
1977	1977-04-08	1977-10-27
1978	1978-04-01	1978-10-21
1979	1979-06-05	1979-10-22
1980	1980-04-21	1980-11-09
1981	1981-02-21	1981-10-05
1982	1982-04-13	1982-10-19
1983	1983-05-07	1983-10-03
1984	1984-05-11	1984-09-25
1985	1985-05-06	1985-09-19
1986	1986-04-08	1986-09-28
1987	1987-04-18	1987-09-26
1988	1988-05-14	1988-09-28
1989	1989-03-11	1989-10-15
1990	1990-05-16	1990-10-17
1991	1991-03-06	1991-10-24
1992	1992-05-01	1992-10-24
1993	1993-05-30	1993-10-07
1994	1994-03-18	1994-10-07
1995	1995-03-20	1995-10-23
1996	1996-02-23	1996-09-12
1997	1997-05-18	1997-10-06
1998	1998-04-15	1998-10-15
1999	1999-04-21	1999-10-27
2000	2000-04-06	2000-10-04
2001	2001-04-27	2001-10-05
2002	2002-04-02	2002-10-02
2003	2003-04-02	2003-10-24
2004	2004-04-17	2004-10-23
2005	2005-05-09	2005-11-04
2006	2006-04-12	2006-11-09
2007	2007-06-06	2007-10-21
2008	2008-04-25	2008-10-05
2009	2009-03-06	2009-10-01
2010	2010-04-01	2010-10-18
2011	2011-04-04	2011-10-26
2012	2012-04-02	2012-11-03
2013	2013-04-30	2013-10-05
2014	2014-04-03	2014-10-27
2015	2015-03-17	2015-10-16
2016	2016-04-06	2016-10-18
2017	2017-02-12	2017-11-18
2018	2018-04-12	2018-10-04
2019	2019-05-16	2019-10-03
2020	2020-03-26	2020-10-15
2021	2021-05-09	2021-10-24

Every Fixed Threshold

Fixed thresholds at Mutual
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	91	147	1956	92
35 C (95 F): Days	91	94	1956	30
40 C (104 F): Days	82	39	1936	3
45 C (113 F): Days	5	4	1936	1
90 F (32.2 C): Days	91	131	1956	66
100 F (37.8 C): Days	91	66	1956	2
110 F (43.3 C): Days	30	11	1936	2
0 C (32 F): Ice days (max	91	36	1978	13
0 C (32 F): Frost days (min	92	138	2013	95
-10 C (14 F): Days with min	92	37	1978	14
-20 C (-4 F): Days with min	27	6	1989	3
20 C (68 F): Tropical nights (min	92	75	2011	31
25 C (77 F): Days with min	54	12	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	99	40	1941	21
25 mm (0.98 in): Days with 25 mm or more rain	99	18	1941	9
50 mm (1.97 in): Days with 50 mm or more rain	85	5	1918	2
100 mm (3.94 in): Days with 100 mm or more rain	12	1	1918	1
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1972	1
10 cm (3.9 in): Days with 10 cm or more snowfall	43	5	1988	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1971	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 Mutual 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).

Mutual Threshold Days by Year (USC00346139)

Key Facts for Mutual Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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