Cottonwood Weir Threshold Days by Year (USC00421759)

18 fixed thresholds counted per year at Cottonwood Weir (USC00421759): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Cottonwood Weir Thresholds

Cottonwood Weir: days with 10 mm (0.39 in) or more of precipitation in 93 years, most in 1983 with 34.
Cottonwood Weir: days with 25 mm (0.98 in) or more of precipitation in 87 years, most in 1982 with 9.
Cottonwood Weir: nights with a minimum temperature at or below 0 C (32 F) in 79 years, most in 1984 with 154.
Cottonwood Weir: nights with a minimum temperature at or above 20 C (68 F) in 79 years, most in 2022 with 61.
18 fixed thresholds have at least one qualifying day at Cottonwood Weir.

Days at or above 30 C (86 F)

75 years with a qualifying day

Days per year at Cottonwood Weir with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 108 in 1958.

Days at or above 30 C (86 F) per year at Cottonwood Weir
Year	Days	Decade average
1942	83	84.6
1943	89	84.6
1944	78	84.6
1945	72	84.6
1946	91	84.6
1947	81	84.6
1948	92	84.6
1949	91	84.6
1950	79	88.2
1951	73	88.2
1952	85	88.2
1953	96	88.2
1954	81	88.2
1955	83	88.2
1956	105	88.2
1958	108	88.2
1959	84	88.2
1960	95	78.6
1961	89	78.6
1962	87	78.6
1963	83	78.6
1966	64	78.6
1968	53	78.6
1969	79	78.6
1970	74	71.9
1971	73	71.9
1973	72	71.9
1974	75	71.9
1976	57	71.9
1977	81	71.9
1978	67	71.9
1979	76	71.9
1981	82	69.3
1982	58	69.3
1983	59	69.3
1984	61	69.3
1985	71	69.3
1987	61	69.3
1988	91	69.3
1989	71	69.3
1990	80	74.6
1991	73	74.6
1992	69	74.6
1993	55	74.6
1994	89	74.6
1995	73	74.6
1996	89	74.6
1997	77	74.6
1998	65	74.6
1999	76	74.6
2000	82	70.9
2002	78	70.9
2004	59	70.9
2005	66	70.9
2006	71	70.9
2007	79	70.9
2008	70	70.9
2009	62	70.9
2010	63	74.7
2011	61	74.7
2012	80	74.7
2013	75	74.7
2014	61	74.7
2015	79	74.7
2016	84	74.7
2017	83	74.7
2018	89	74.7
2019	72	74.7
2020	89	80.7
2021	91	80.7
2022	84	80.7
2023	51	80.7
2024	88	80.7
2025	86	80.7
2026	76	80.7

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

First to last qualifying date each year at Cottonwood Weir
Year	First date	Last date
1942	1942-05-22	1942-09-27
1943	1943-05-27	1943-10-03
1944	1944-06-24	1944-09-22
1945	1945-06-19	1945-09-15
1946	1946-04-25	1946-09-30
1947	1947-05-02	1947-10-05
1948	1948-05-16	1948-10-02
1949	1949-04-23	1949-09-27
1950	1950-05-22	1950-09-07
1951	1951-05-27	1951-09-27
1952	1952-05-12	1952-10-03
1953	1953-06-09	1953-10-09
1954	1954-05-08	1954-10-07
1955	1955-06-07	1955-09-15
1956	1956-05-18	1956-09-26
1958	1958-05-18	1958-10-13
1959	1959-05-13	1959-09-12
1960	1960-05-10	1960-09-30
1961	1961-05-23	1961-09-15
1962	1962-06-09	1962-10-10
1963	1963-06-19	1963-10-10
1966	1966-05-03	1966-09-24
1968	1968-05-29	1968-09-11
1969	1969-05-25	1969-09-29
1970	1970-05-17	1970-10-01
1971	1971-06-16	1971-09-14
1973	1973-06-07	1973-09-30
1974	1974-05-26	1974-09-06
1976	1976-05-17	1976-09-06
1977	1977-05-31	1977-09-10
1978	1978-06-09	1978-09-06
1979	1979-05-23	1979-10-07
1981	1981-06-08	1981-09-20
1982	1982-06-20	1982-09-09
1983	1983-05-26	1983-09-16
1984	1984-05-13	1984-09-20
1985	1985-06-07	1985-09-02
1987	1987-04-27	1987-09-03
1988	1988-05-15	1988-09-10
1989	1989-05-07	1989-09-29
1990	1990-06-03	1990-09-16
1991	1991-06-11	1991-09-06
1992	1992-06-02	1992-10-01
1993	1993-06-14	1993-09-12
1994	1994-05-29	1994-09-29
1995	1995-06-11	1995-09-17
1996	1996-05-13	1996-10-11
1997	1997-05-15	1997-09-18
1998	1998-06-28	1998-09-17
1999	1999-05-23	1999-10-12
2000	2000-05-04	2000-09-17
2002	2002-05-30	2002-09-06
2004	2004-06-03	2004-09-12
2005	2005-05-21	2005-09-09
2006	2006-05-16	2006-09-14
2007	2007-05-12	2007-09-12
2008	2008-05-20	2008-08-31
2009	2009-05-18	2009-09-29
2010	2010-06-24	2010-10-02
2011	2011-06-22	2011-10-01
2012	2012-05-21	2012-09-10
2013	2013-05-13	2013-09-07
2014	2014-05-28	2014-09-26
2015	2015-05-31	2015-09-27
2016	2016-06-03	2016-09-20
2017	2017-05-31	2017-09-13
2018	2018-06-04	2018-09-20
2019	2019-06-25	2019-09-16
2020	2020-05-29	2020-09-25
2021	2021-06-02	2021-09-16
2022	2022-05-26	2022-09-27
2023	2023-06-25	2023-09-09
2024	2024-06-06	2024-10-05
2025	2025-05-29	2025-09-11
2026	2026-05-11	2026-08-28

Every Fixed Threshold

Fixed thresholds at Cottonwood Weir
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	75	108	1958	76
35 C (95 F): Days	74	53	1961	32
40 C (104 F): Days	10	6	1960	1
90 F (32.2 C): Days	75	86	1956	57
100 F (37.8 C): Days	44	18	1960	10
0 C (32 F): Ice days (max	75	46	1985	3
0 C (32 F): Frost days (min	79	154	1984	43
-10 C (14 F): Days with min	77	40	1949	7
-20 C (-4 F): Days with min	9	5	1990	1
20 C (68 F): Tropical nights (min	79	61	2022	47
25 C (77 F): Days with min	41	6	2020	9
10 mm (0.39 in): Days with 10 mm or more rain	93	34	1983	13
25 mm (0.98 in): Days with 25 mm or more rain	87	9	1982	2
50 mm (1.97 in): Days with 50 mm or more rain	13	2	1985	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1982	1
10 cm (3.9 in): Days with 10 cm or more snowfall	71	19	1996	2
25 cm (9.8 in): Days with 25 cm or more snowfall	50	6	1994	1
50 cm (19.7 in): Days with 50 cm or more snowfall	8	1	1939	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1942.

Download the Data

Data for Cottonwood Weir 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Cottonwood Weir Threshold Days by Year (USC00421759)

Key Facts for Cottonwood Weir Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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