Longvalley Threshold Days by Year (USC00394983)

20 fixed thresholds counted per year at Longvalley (USC00394983): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Longvalley Thresholds

Longvalley: days with 10 mm (0.39 in) or more of precipitation in 80 years, most in 1982 with 27.
Longvalley: nights with a minimum temperature at or below 0 C (32 F) in 76 years, most in 1983 with 195.
Longvalley: nights with a minimum temperature at or below -10 C (14 F) in 76 years, most in 1978 with 84.
Longvalley: nights with a minimum temperature at or below -20 C (-4 F) in 76 years, most in 1985 with 34.
20 fixed thresholds have at least one qualifying day at Longvalley.

Days at or above 30 C (86 F)

74 years with a qualifying day

Days per year at Longvalley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 90 in 1939.

Days at or above 30 C (86 F) per year at Longvalley
Year	Days	Decade average
1928	46	46
1930	58	73.8
1932	63	73.8
1938	84	73.8
1939	90	73.8
1940	73	65.2
1941	71	65.2
1942	49	65.2
1943	74	65.2
1944	49	65.2
1945	57	65.2
1946	72	65.2
1947	79	65.2
1948	63	65.2
1950	65	70.3
1951	42	70.3
1952	80	70.3
1953	71	70.3
1954	68	70.3
1955	81	70.3
1956	83	70.3
1957	61	70.3
1958	65	70.3
1959	87	70.3
1960	65	60.2
1962	43	60.2
1963	84	60.2
1964	62	60.2
1965	45	60.2
1966	69	60.2
1967	55	60.2
1968	50	60.2
1969	69	60.2
1970	83	65.5
1971	72	65.5
1972	54	65.5
1973	67	65.5
1974	74	65.5
1975	60	65.5
1976	84	65.5
1977	59	65.5
1978	55	65.5
1979	47	65.5
1980	84	67.1
1981	57	67.1
1982	49	67.1
1983	62	67.1
1984	74	67.1
1985	81	67.1
1986	53	67.1
1987	65	67.1
1988	76	67.1
1989	70	67.1
1990	63	51.8
1991	55	51.8
1992	40	51.8
1993	17	51.8
1994	61	51.8
1995	60	51.8
1996	62	51.8
1997	58	51.8
1998	48	51.8
1999	54	51.8
2000	80	67.6
2001	72	67.6
2003	77	67.6
2004	52	67.6
2005	75	67.6
2006	77	67.6
2007	82	67.6
2008	58	67.6
2009	35	67.6
2010	66	62
2011	58	62

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

First to last qualifying date each year at Longvalley
Year	First date	Last date
1928	1928-05-01	1928-10-10
1930	1930-05-20	1930-09-22
1932	1932-05-13	1932-10-16
1938	1938-04-30	1938-10-27
1939	1939-04-22	1939-10-01
1940	1940-06-01	1940-10-21
1941	1941-05-12	1941-09-19
1942	1942-04-14	1942-10-11
1943	1943-03-29	1943-10-11
1944	1944-05-13	1944-09-29
1945	1945-04-08	1945-10-03
1946	1946-03-28	1946-10-01
1947	1947-04-14	1947-10-21
1948	1948-04-17	1948-10-05
1950	1950-04-18	1950-10-30
1951	1951-04-29	1951-10-01
1952	1952-04-26	1952-09-30
1953	1953-05-28	1953-10-13
1954	1954-05-20	1954-10-08
1955	1955-04-30	1955-10-10
1956	1956-05-08	1956-10-12
1957	1957-05-01	1957-10-02
1958	1958-04-16	1958-10-19
1959	1959-04-30	1959-09-14
1960	1960-04-10	1960-10-08
1962	1962-04-20	1962-10-14
1963	1963-05-06	1963-10-23
1964	1964-04-16	1964-10-15
1965	1965-04-30	1965-10-15
1966	1966-05-04	1966-09-12
1967	1967-05-22	1967-10-03
1968	1968-04-30	1968-10-30
1969	1969-05-14	1969-09-28
1970	1970-05-07	1970-10-05
1971	1971-04-10	1971-09-25
1972	1972-05-16	1972-09-27
1973	1973-05-18	1973-10-23
1974	1974-05-19	1974-10-21
1975	1975-04-26	1975-10-07
1976	1976-05-11	1976-10-10
1977	1977-04-09	1977-09-21
1978	1978-05-23	1978-10-08
1979	1979-05-16	1979-10-07
1980	1980-04-20	1980-10-09
1981	1981-05-02	1981-09-28
1982	1982-05-02	1982-09-10
1983	1983-05-26	1983-08-31
1984	1984-05-15	1984-09-21
1985	1985-04-11	1985-09-19
1986	1986-05-04	1986-08-30
1987	1987-04-17	1987-10-03
1988	1988-04-30	1988-09-17
1989	1989-04-21	1989-09-30
1990	1990-04-22	1990-10-06
1991	1991-04-06	1991-10-17
1992	1992-04-30	1992-10-21
1993	1993-05-26	1993-10-06
1994	1994-05-16	1994-09-28
1995	1995-06-13	1995-10-12
1996	1996-04-10	1996-10-05
1997	1997-05-17	1997-10-11
1998	1998-05-17	1998-09-18
1999	1999-06-02	1999-09-24
2000	2000-05-04	2000-09-29
2001	2001-04-28	2001-10-01
2003	2003-04-12	2003-10-19
2004	2004-05-05	2004-09-19
2005	2005-05-19	2005-10-02
2006	2006-05-18	2006-10-02
2007	2007-05-11	2007-10-01
2008	2008-04-15	2008-09-26
2009	2009-04-23	2009-09-14
2010	2010-05-28	2010-10-07
2011	2011-06-02	2011-10-04

Every Fixed Threshold

Fixed thresholds at Longvalley
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	74	90	1939	58
35 C (95 F): Days	74	44	1959	16
40 C (104 F): Days	47	8	1974	1
45 C (113 F): Days	3	1	1939	1
90 F (32.2 C): Days	74	68	1980	32
100 F (37.8 C): Days	69	19	1947	5
110 F (43.3 C): Days	9	2	1947	1
0 C (32 F): Ice days (max	74	77	1978	36
0 C (32 F): Frost days (min	76	195	1983	147
-10 C (14 F): Days with min	76	84	1978	60
-20 C (-4 F): Days with min	76	34	1985	10
-30 C (-22 F): Days with min	35	6	1983	1
20 C (68 F): Tropical nights (min	74	23	2001	10
25 C (77 F): Days with min	11	2	1938	1
10 mm (0.39 in): Days with 10 mm or more rain	80	27	1982	20
25 mm (0.98 in): Days with 25 mm or more rain	74	11	1942	2
50 mm (1.97 in): Days with 50 mm or more rain	28	3	1946	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1988	1
10 cm (3.9 in): Days with 10 cm or more snowfall	66	9	1977	3
25 cm (9.8 in): Days with 25 cm or more snowfall	17	3	1950	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1928.

Download the Data

Data for Longvalley 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).

Longvalley Threshold Days by Year (USC00394983)

Key Facts for Longvalley Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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