Willow Rsvr Threshold Days by Year (USC00479236)

20 fixed thresholds counted per year at Willow Rsvr (USC00479236): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Willow Rsvr Thresholds

Willow Rsvr: days with a maximum temperature at or below 0 C (32 F) in 85 years, most in 1978 with 117.
Willow Rsvr: nights with a minimum temperature at or below 0 C (32 F) in 84 years, most in 1981 with 212.
Willow Rsvr: nights with a minimum temperature at or below -10 C (14 F) in 84 years, most in 1978 with 114.
Willow Rsvr: nights with a minimum temperature at or below -20 C (-4 F) in 84 years, most in 1978 with 65.
20 fixed thresholds have at least one qualifying day at Willow Rsvr.

Days at or above 30 C (86 F)

80 years with a qualifying day

Days per year at Willow Rsvr with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 39 in 1936.

Days at or above 30 C (86 F) per year at Willow Rsvr
Year	Days	Decade average
1935	28	25.8
1936	39	25.8
1937	30	25.8
1938	9	25.8
1939	23	25.8
1940	9	14.1
1941	17	14.1
1942	7	14.1
1943	15	14.1
1944	14	14.1
1945	9	14.1
1946	4	14.1
1947	28	14.1
1948	24	14.1
1950	2	10.7
1951	2	10.7
1952	11	10.7
1953	11	10.7
1954	10	10.7
1955	26	10.7
1956	6	10.7
1957	14	10.7
1958	6	10.7
1959	19	10.7
1960	10	10.2
1961	10	10.2
1962	4	10.2
1963	17	10.2
1964	19	10.2
1965	7	10.2
1966	14	10.2
1967	1	10.2
1968	11	10.2
1969	9	10.2
1970	24	10.3
1971	3	10.3
1972	8	10.3
1973	7	10.3
1974	7	10.3
1975	17	10.3
1976	20	10.3
1977	10	10.3
1978	6	10.3
1979	1	10.3
1980	8	8.7
1981	4	8.7
1982	2	8.7
1986	7	8.7
1987	5	8.7
1988	27	8.7
1989	8	8.7
1990	1	3.9
1992	2	3.9
1994	2	3.9
1995	10	3.9
1996	1	3.9
1997	1	3.9
1998	6	3.9
1999	8	3.9
2000	3	9.1
2001	11	9.1
2002	11	9.1
2003	8	9.1
2005	20	9.1
2006	18	9.1
2007	8	9.1
2008	1	9.1
2009	2	9.1
2010	6	5.4
2011	5	5.4
2012	12	5.4
2013	4	5.4
2015	2	5.4
2016	1	5.4
2018	8	5.4
2020	8	6
2021	5	6
2022	6	6
2023	9	6
2024	2	6

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

First to last qualifying date each year at Willow Rsvr
Year	First date	Last date
1935	1935-06-11	1935-08-19
1936	1936-05-09	1936-09-22
1937	1937-05-30	1937-09-23
1938	1938-06-21	1938-08-30
1939	1939-05-05	1939-09-23
1940	1940-06-06	1940-08-04
1941	1941-06-21	1941-08-07
1942	1942-07-12	1942-08-21
1943	1943-06-19	1943-08-08
1944	1944-05-30	1944-08-14
1945	1945-07-19	1945-09-07
1946	1946-07-06	1946-08-17
1947	1947-07-10	1947-10-21
1948	1948-06-01	1948-09-16
1950	1950-08-08	1950-08-17
1951	1951-07-26	1951-07-29
1952	1952-04-28	1952-09-13
1953	1953-06-20	1953-09-03
1954	1954-06-17	1954-07-29
1955	1955-05-03	1955-09-16
1956	1956-06-09	1956-06-14
1957	1957-06-17	1957-09-01
1958	1958-06-29	1958-08-10
1959	1959-05-02	1959-09-08
1960	1960-07-21	1960-09-07
1961	1961-06-28	1961-09-09
1962	1962-05-14	1962-07-07
1963	1963-06-03	1963-08-08
1964	1964-05-22	1964-08-02
1965	1965-06-27	1965-08-15
1966	1966-06-24	1966-07-25
1967	1967-07-20	1967-07-20
1968	1968-06-05	1968-08-24
1969	1969-05-28	1969-08-31
1970	1970-04-29	1970-09-05
1971	1971-06-27	1971-09-03
1972	1972-05-17	1972-08-17
1973	1973-06-11	1973-08-30
1974	1974-07-03	1974-07-19
1975	1975-05-21	1975-08-25
1976	1976-06-09	1976-09-09
1977	1977-05-25	1977-08-28
1978	1978-05-27	1978-09-09
1979	1979-07-12	1979-07-12
1980	1980-04-23	1980-07-16
1981	1981-07-07	1981-08-14
1982	1982-07-06	1982-08-04
1986	1986-05-29	1986-08-17
1987	1987-04-19	1987-07-31
1988	1988-05-29	1988-08-17
1989	1989-07-04	1989-08-05
1990	1990-07-04	1990-07-04
1992	1992-06-12	1992-08-10
1994	1994-05-21	1994-06-18
1995	1995-06-18	1995-07-31
1996	1996-06-30	1996-06-30
1997	1997-07-18	1997-07-18
1998	1998-07-14	1998-09-12
1999	1999-06-26	1999-08-28
2000	2000-06-09	2000-09-01
2001	2001-06-26	2001-08-09
2002	2002-07-01	2002-09-10
2003	2003-07-30	2003-09-09
2005	2005-06-21	2005-09-12
2006	2006-05-29	2006-08-01
2007	2007-06-13	2007-09-07
2008	2008-09-01	2008-09-01
2009	2009-06-24	2009-06-25
2010	2010-05-25	2010-08-13
2011	2011-06-08	2011-07-21
2012	2012-07-03	2012-09-05
2013	2013-07-17	2013-08-26
2015	2015-08-15	2015-08-16
2016	2016-07-23	2016-07-23
2018	2018-05-27	2018-07-05
2020	2020-06-03	2020-07-19
2021	2021-06-06	2021-07-06
2022	2022-05-13	2022-07-19
2023	2023-06-01	2023-09-05
2024	2024-07-16	2024-08-27

Every Fixed Threshold

Fixed thresholds at Willow Rsvr
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	80	39	1936	2
35 C (95 F): Days	13	9	1936	1
40 C (104 F): Days	1	6	1936	6
90 F (32.2 C): Days	51	19	1936	3
100 F (37.8 C): Days	2	8	1936	1
110 F (43.3 C): Days	1	1	1936	1
0 C (32 F): Ice days (max	85	117	1978	71
0 C (32 F): Frost days (min	84	212	1981	167
-10 C (14 F): Days with min	84	114	1978	45
-20 C (-4 F): Days with min	84	65	1978	14
-30 C (-22 F): Days with min	75	21	1982	2
-40 C (-40 F): Days with min	9	4	1996	4
20 C (68 F): Tropical nights (min	53	7	1937	1
25 C (77 F): Days with min	4	3	1937	1
10 mm (0.39 in): Days with 10 mm or more rain	80	35	1996	14
25 mm (0.98 in): Days with 25 mm or more rain	80	13	2016	2
50 mm (1.97 in): Days with 50 mm or more rain	46	4	2010	2
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1981	1
10 cm (3.9 in): Days with 10 cm or more snowfall	65	11	2019	3
25 cm (9.8 in): Days with 25 cm or more snowfall	12	2	1945	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1935.

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Data for Willow Rsvr 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).

Willow Rsvr Threshold Days by Year (USC00479236)

Key Facts for Willow Rsvr Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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