Challis Threshold Days by Year (USC00101663)

14 fixed thresholds counted per year at Challis (USC00101663): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Challis Thresholds

Challis: nights with a minimum temperature at or below 0 C (32 F) in 79 years, most in 1914 with 235.
Challis: nights with a minimum temperature at or below -10 C (14 F) in 79 years, most in 1985 with 111.
Challis: days with a maximum temperature at or above 30 C (86 F) in 75 years, most in 1966 with 72.
Challis: days with a maximum temperature at or above 90 F (32.2 C) in 75 years, most in 1961 with 41.
14 fixed thresholds have at least one qualifying day at Challis.

Days at or above 30 C (86 F)

75 years with a qualifying day

Days per year at Challis with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 72 in 1966.

Days at or above 30 C (86 F) per year at Challis
Year	Days	Decade average
1914	34	30
1915	24	30
1916	29	30
1917	28	30
1918	18	30
1919	47	30
1920	29	27.9
1921	22	27.9
1922	18	27.9
1923	12	27.9
1924	17	27.9
1925	20	27.9
1926	24	27.9
1928	53	27.9
1929	56	27.9
1930	49	45.3
1933	58	45.3
1934	49	45.3
1935	40	45.3
1936	44	45.3
1937	49	45.3
1938	29	45.3
1939	44	45.3
1940	53	33.7
1941	21	33.7
1942	45	33.7
1943	28	33.7
1944	14	33.7
1945	42	33.7
1946	32	33.7
1947	37	33.7
1948	31	33.7
1949	34	33.7
1950	28	36.4
1951	28	36.4
1952	29	36.4
1953	32	36.4
1954	35	36.4
1955	51	36.4
1956	31	36.4
1957	45	36.4
1958	33	36.4
1959	52	36.4
1960	49	49.4
1961	63	49.4
1962	37	49.4
1963	42	49.4
1965	22	49.4
1966	72	49.4
1967	67	49.4
1968	38	49.4
1969	55	49.4
1970	59	42
1971	50	42
1972	52	42
1973	48	42
1974	51	42
1975	34	42
1976	35	42
1977	37	42
1978	32	42
1979	22	42
1980	23	37.7
1981	56	37.7
1982	29	37.7
1983	22	37.7
1984	29	37.7
1985	44	37.7
1986	42	37.7
1987	27	37.7
1988	62	37.7
1989	43	37.7
1990	48	43
1991	48	43
1992	33	43

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

First to last qualifying date each year at Challis
Year	First date	Last date
1914	1914-06-16	1914-09-04
1915	1915-04-16	1915-08-31
1916	1916-06-16	1916-09-19
1917	1917-06-21	1917-08-25
1918	1918-06-10	1918-08-25
1919	1919-05-27	1919-08-25
1920	1920-07-02	1920-08-24
1921	1921-06-28	1921-08-30
1922	1922-06-20	1922-08-27
1923	1923-06-30	1923-08-17
1924	1924-06-30	1924-09-08
1925	1925-06-26	1925-08-06
1926	1926-06-07	1926-09-09
1928	1928-05-21	1928-09-26
1929	1929-05-22	1929-09-18
1930	1930-05-28	1930-09-05
1933	1933-05-30	1933-09-05
1934	1934-05-24	1934-09-03
1935	1935-06-21	1935-09-10
1936	1936-05-30	1936-09-24
1937	1937-05-16	1937-09-18
1938	1938-06-04	1938-09-18
1939	1939-06-28	1939-09-20
1940	1940-05-13	1940-08-31
1941	1941-06-22	1941-08-08
1942	1942-07-02	1942-09-04
1943	1943-07-06	1943-09-12
1944	1944-06-24	1944-09-08
1945	1945-06-21	1945-09-04
1946	1946-07-04	1946-09-14
1947	1947-05-07	1947-09-05
1948	1948-06-07	1948-09-14
1949	1949-06-10	1949-09-01
1950	1950-06-29	1950-09-06
1951	1951-06-15	1951-08-19
1952	1952-06-09	1952-09-18
1953	1953-07-05	1953-09-13
1954	1954-05-18	1954-09-02
1955	1955-06-21	1955-09-08
1956	1956-06-10	1956-09-20
1957	1957-06-03	1957-09-07
1958	1958-05-20	1958-09-11
1959	1959-06-12	1959-09-11
1960	1960-05-11	1960-09-19
1961	1961-06-15	1961-08-30
1962	1962-06-18	1962-09-07
1963	1963-07-02	1963-09-07
1965	1965-07-06	1965-08-11
1966	1966-05-03	1966-09-24
1967	1967-05-21	1967-09-29
1968	1968-06-18	1968-09-11
1969	1969-05-23	1969-09-09
1970	1970-06-03	1970-08-31
1971	1971-06-22	1971-09-13
1972	1972-05-30	1972-09-05
1973	1973-06-21	1973-09-12
1974	1974-06-12	1974-09-04
1975	1975-06-30	1975-09-07
1976	1976-06-07	1976-09-05
1977	1977-05-31	1977-09-08
1978	1978-06-29	1978-09-04
1979	1979-06-11	1979-09-18
1980	1980-06-29	1980-08-14
1981	1981-06-25	1981-09-18
1982	1982-06-28	1982-09-08
1983	1983-05-27	1983-09-01
1984	1984-05-29	1984-09-19
1985	1985-06-08	1985-08-29
1986	1986-05-27	1986-08-29
1987	1987-06-14	1987-09-25
1988	1988-06-04	1988-09-09
1989	1989-06-14	1989-08-22
1990	1990-06-22	1990-09-15
1991	1991-06-10	1991-09-06
1992	1992-06-21	1992-09-22

Every Fixed Threshold

Fixed thresholds at Challis
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	75	72	1966	33
35 C (95 F): Days	50	14	1966	8
90 F (32.2 C): Days	75	41	1961	18
100 F (37.8 C): Days	7	4	1928	1
0 C (32 F): Ice days (max	75	96	1985	36
0 C (32 F): Frost days (min	79	235	1914	170
-10 C (14 F): Days with min	79	111	1985	38
-20 C (-4 F): Days with min	72	35	1922	7
-30 C (-22 F): Days with min	25	7	1979	3
20 C (68 F): Tropical nights (min	7	2	1928	1
10 mm (0.39 in): Days with 10 mm or more rain	70	7	1915	6
25 mm (0.98 in): Days with 25 mm or more rain	16	2	1915	1
10 cm (3.9 in): Days with 10 cm or more snowfall	26	4	1919	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1985	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1914.

Download the Data

Data for Challis 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).

Challis Threshold Days by Year (USC00101663)

Key Facts for Challis Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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