Hayden Threshold Days by Year (USC00053867)

16 fixed thresholds counted per year at Hayden (USC00053867): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hayden Thresholds

Hayden: nights with a minimum temperature at or below 0 C (32 F) in 104 years, most in 1955 with 245.
Hayden: nights with a minimum temperature at or below -10 C (14 F) in 104 years, most in 1929 with 134.
Hayden: nights with a minimum temperature at or below -20 C (-4 F) in 104 years, most in 1929 with 52.
Hayden: days with a maximum temperature at or above 30 C (86 F) in 103 years, most in 2025 with 64.
16 fixed thresholds have at least one qualifying day at Hayden.

Days at or above 30 C (86 F)

103 years with a qualifying day

Days per year at Hayden with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 64 in 2025.

Days at or above 30 C (86 F) per year at Hayden
Year	Days	Decade average
1915	31	27
1916	23	27
1921	37	31.6
1922	50	31.6
1923	17	31.6
1925	22	31.6
1926	35	31.6
1927	15	31.6
1929	45	31.6
1933	62	48.3
1934	52	48.3
1935	37	48.3
1936	53	48.3
1937	46	48.3
1938	38	48.3
1939	50	48.3
1940	63	40.9
1941	40	40.9
1942	48	40.9
1943	41	40.9
1944	44	40.9
1945	29	40.9
1946	44	40.9
1947	36	40.9
1948	40	40.9
1949	24	40.9
1950	21	31.7
1951	31	31.7
1952	33	31.7
1953	41	31.7
1954	40	31.7
1955	38	31.7
1956	20	31.7
1957	17	31.7
1958	35	31.7
1959	41	31.7
1960	57	28.7
1961	40	28.7
1962	18	28.7
1963	27	28.7
1964	32	28.7
1965	11	28.7
1966	32	28.7
1967	24	28.7
1968	15	28.7
1969	31	28.7
1970	32	39.6
1971	39	39.6
1972	27	39.6
1973	27	39.6
1974	36	39.6
1975	32	39.6
1976	46	39.6
1977	57	39.6
1978	48	39.6
1979	52	39.6
1980	54	35.4
1981	48	35.4
1982	39	35.4
1983	45	35.4
1984	37	35.4
1985	26	35.4
1986	17	35.4
1987	21	35.4
1988	41	35.4
1989	26	35.4
1990	28	27.5
1991	26	27.5
1992	20	27.5
1993	13	27.5
1994	40	27.5
1995	30	27.5
1996	44	27.5
1997	18	27.5
1998	32	27.5
1999	24	27.5
2000	52	44.9
2001	44	44.9
2002	57	44.9
2003	53	44.9
2004	34	44.9
2005	31	44.9
2006	43	44.9
2007	62	44.9
2008	43	44.9
2009	30	44.9
2010	29	37.1
2011	33	37.1
2012	37	37.1
2013	48	37.1
2014	24	37.1
2015	31	37.1
2016	35	37.1
2017	44	37.1
2018	52	37.1
2019	38	37.1
2020	56	58
2021	63	58
2022	62	58
2023	37	58
2024	52	58
2025	64	58
2026	72	58

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

First to last qualifying date each year at Hayden
Year	First date	Last date
1915	1915-06-09	1915-09-02
1916	1916-06-18	1916-09-02
1921	1921-06-11	1921-09-27
1922	1922-06-07	1922-09-15
1923	1923-06-30	1923-08-07
1925	1925-06-19	1925-08-08
1926	1926-06-25	1926-08-30
1927	1927-06-23	1927-08-01
1929	1929-06-25	1929-09-17
1933	1933-05-31	1933-09-07
1934	1934-05-20	1934-08-28
1935	1935-06-09	1935-09-19
1936	1936-05-30	1936-08-25
1937	1937-06-17	1937-09-18
1938	1938-06-02	1938-09-29
1939	1939-05-29	1939-09-03
1940	1940-06-01	1940-09-08
1941	1941-06-17	1941-08-28
1942	1942-05-26	1942-09-08
1943	1943-06-20	1943-08-29
1944	1944-06-19	1944-09-21
1945	1945-06-21	1945-09-07
1946	1946-06-14	1946-09-14
1947	1947-06-17	1947-09-04
1948	1948-06-06	1948-09-25
1949	1949-07-01	1949-08-22
1950	1950-06-11	1950-09-07
1951	1951-07-02	1951-08-18
1952	1952-06-09	1952-09-06
1953	1953-06-10	1953-09-12
1954	1954-06-19	1954-09-02
1955	1955-06-22	1955-09-08
1956	1956-06-10	1956-08-13
1957	1957-06-29	1957-08-19
1958	1958-05-30	1958-09-11
1959	1959-06-06	1959-09-13
1960	1960-06-19	1960-09-08
1961	1961-06-09	1961-08-28
1962	1962-06-26	1962-08-26
1963	1963-06-23	1963-08-19
1964	1964-06-26	1964-08-15
1965	1965-07-15	1965-08-13
1966	1966-06-19	1966-08-26
1967	1967-07-03	1967-09-05
1968	1968-06-19	1968-08-07
1969	1969-06-05	1969-08-26
1970	1970-06-24	1970-08-29
1971	1971-06-17	1971-08-24
1972	1972-06-29	1972-08-13
1973	1973-06-09	1973-08-20
1974	1974-06-13	1974-09-10
1975	1975-06-29	1975-09-01
1976	1976-06-05	1976-09-06
1977	1977-06-01	1977-09-08
1978	1978-06-09	1978-09-07
1979	1979-06-04	1979-09-17
1980	1980-05-22	1980-09-18
1981	1981-06-11	1981-08-30
1982	1982-06-27	1982-09-03
1983	1983-06-18	1983-09-07
1984	1984-05-23	1984-08-11
1985	1985-06-07	1985-08-31
1986	1986-06-16	1986-08-20
1987	1987-06-27	1987-09-01
1988	1988-06-04	1988-08-31
1989	1989-06-15	1989-08-29
1990	1990-06-18	1990-09-15
1991	1991-06-24	1991-09-01
1992	1992-06-19	1992-08-21
1993	1993-06-27	1993-08-24
1994	1994-06-17	1994-08-26
1995	1995-07-06	1995-09-05
1996	1996-06-09	1996-09-10
1997	1997-06-04	1997-09-02
1998	1998-06-29	1998-09-07
1999	1999-06-24	1999-08-26
2000	2000-05-29	2000-09-16
2001	2001-06-08	2001-09-04
2002	2002-05-30	2002-08-28
2003	2003-05-28	2003-09-04
2004	2004-06-03	2004-09-02
2005	2005-06-19	2005-08-29
2006	2006-06-02	2006-09-05
2007	2007-06-15	2007-09-04
2008	2008-06-16	2008-08-30
2009	2009-06-24	2009-08-28
2010	2010-06-06	2010-09-19
2011	2011-06-23	2011-08-31
2012	2012-07-01	2012-08-30
2013	2013-06-09	2013-09-07
2014	2014-06-25	2014-08-18
2015	2015-06-17	2015-08-29
2016	2016-06-06	2016-08-31
2017	2017-06-08	2017-09-12
2018	2018-06-05	2018-09-18
2019	2019-06-29	2019-09-06
2020	2020-06-05	2020-09-06
2021	2021-06-03	2021-09-11
2022	2022-06-02	2022-09-08
2023	2023-07-02	2023-08-31
2024	2024-06-06	2024-09-29
2025	2025-05-31	2025-09-10
2026	2026-05-13	2026-09-13

Every Fixed Threshold

Fixed thresholds at Hayden
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	103	64	2025	72
35 C (95 F): Days	49	10	1929	22
90 F (32.2 C): Days	101	44	1940	49
100 F (37.8 C): Days	2	1	1929	1
0 C (32 F): Ice days (max	103	84	1973	7
0 C (32 F): Frost days (min	104	245	1955	103
-10 C (14 F): Days with min	104	134	1929	20
-20 C (-4 F): Days with min	104	52	1929	1
-30 C (-22 F): Days with min	65	9	1929	1
-40 C (-40 F): Days with min	7	2	1948	1
10 mm (0.39 in): Days with 10 mm or more rain	101	19	1997	8
25 mm (0.98 in): Days with 25 mm or more rain	48	2	1925	1
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1916	1
10 cm (3.9 in): Days with 10 cm or more snowfall	94	18	1916	2
25 cm (9.8 in): Days with 25 cm or more snowfall	37	3	1916	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	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 1915.

Download the Data

Data for Hayden 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).

Hayden Threshold Days by Year (USC00053867)

Key Facts for Hayden Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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