Koosharem Threshold Days by Year

12 fixed thresholds counted per year at Koosharem (USC00424764): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Koosharem Thresholds

Koosharem: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 1957 with 10.
Koosharem: nights with a minimum temperature at or below 0 C (32 F) in 44 years, most in 1970 with 243.
Koosharem: nights with a minimum temperature at or below -10 C (14 F) in 44 years, most in 1955 with 101.
Koosharem: days with 10 cm (3.9 in) or more of snowfall in 44 years, most in 1957 with 7.
12 fixed thresholds have at least one qualifying day at Koosharem.

Days at or above 30 C (86 F)

41 years with a qualifying day

Days per year at Koosharem with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 48 in 1960.

Days at or above 30 C (86 F) per year at Koosharem
Year	Days	Decade average
1894	9	11.5
1895	14	11.5
1921	29	14.8
1922	8	14.8
1926	14	14.8
1927	11	14.8
1928	12	14.8
1953	25	31.4
1954	34	31.4
1955	32	31.4
1956	35	31.4
1957	22	31.4
1958	31	31.4
1959	41	31.4
1960	48	30.7
1961	32	30.7
1962	34	30.7
1963	34	30.7
1964	29	30.7
1965	5	30.7
1966	31	30.7
1967	30	30.7
1969	33	30.7
1970	27	32.6
1971	34	32.6
1972	26	32.6
1973	28	32.6
1974	39	32.6
1975	19	32.6
1976	35	32.6
1977	41	32.6
1978	36	32.6
1979	41	32.6
1980	39	29.2
1981	47	29.2
1982	26	29.2
1983	10	29.2
1984	17	29.2
1985	36	29.2
2006	23	32
2007	41	32

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

First to last qualifying date each year at Koosharem
Year	First date	Last date
1894	1894-06-30	1894-08-01
1895	1895-07-01	1895-09-12
1921	1921-06-10	1921-08-19
1922	1922-06-24	1922-10-02
1926	1926-06-24	1926-08-01
1927	1927-06-22	1927-08-01
1928	1928-06-25	1928-08-21
1953	1953-06-13	1953-08-20
1954	1954-05-19	1954-09-04
1955	1955-06-06	1955-09-11
1956	1956-06-08	1956-09-19
1957	1957-06-24	1957-09-06
1958	1958-06-23	1958-09-01
1959	1959-06-05	1959-09-10
1960	1960-06-03	1960-09-07
1961	1961-06-18	1961-08-07
1962	1962-06-22	1962-09-19
1963	1963-06-26	1963-09-27
1964	1964-06-25	1964-08-24
1965	1965-07-03	1965-08-06
1966	1966-06-26	1966-09-26
1967	1967-06-30	1967-09-04
1969	1969-07-01	1969-09-07
1970	1970-06-24	1970-08-30
1971	1971-06-16	1971-09-13
1972	1972-06-30	1972-08-12
1973	1973-06-08	1973-08-16
1974	1974-06-12	1974-09-09
1975	1975-07-01	1975-08-10
1976	1976-06-19	1976-09-05
1977	1977-05-31	1977-09-08
1978	1978-06-21	1978-09-05
1979	1979-06-12	1979-09-07
1980	1980-06-22	1980-08-13
1981	1981-06-06	1981-08-28
1982	1982-06-27	1982-09-04
1983	1983-07-05	1983-09-13
1984	1984-05-23	1984-09-04
1985	1985-06-08	1985-09-02
2006	2006-06-02	2006-08-08
2007	2007-06-15	2007-09-02

Every Fixed Threshold

Fixed thresholds at Koosharem
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	41	48	1960	41
35 C (95 F): Days	14	4	1960	1
90 F (32.2 C): Days	39	30	1960	16
0 C (32 F): Ice days (max	41	51	1894	35
0 C (32 F): Frost days (min	44	243	1970	214
-10 C (14 F): Days with min	44	101	1955	69
-20 C (-4 F): Days with min	43	23	1955	11
-30 C (-22 F): Days with min	9	2	1963	4
10 mm (0.39 in): Days with 10 mm or more rain	56	10	1957	6
25 mm (0.98 in): Days with 25 mm or more rain	18	2	1967	1
10 cm (3.9 in): Days with 10 cm or more snowfall	44	7	1957	3
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1959	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Koosharem 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Koosharem Threshold Days by Year

Key Facts for Koosharem Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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