Idaho City Threshold Days by Year

17 fixed thresholds counted per year at Idaho City (USC00104442): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Idaho City Thresholds

Idaho City: days with a maximum temperature at or above 30 C (86 F) in 89 years, most in 1934 with 92.
Idaho City: days with a maximum temperature at or above 90 F (32.2 C) in 89 years, most in 1940 with 71.
Idaho City: days with a maximum temperature at or below 0 C (32 F) in 89 years, most in 1985 with 62.
Idaho City: days with a maximum temperature at or above 35 C (95 F) in 88 years, most in 1933 with 37.
17 fixed thresholds have at least one qualifying day at Idaho City.

Days at or above 30 C (86 F)

89 years with a qualifying day

Days per year at Idaho City with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 92 in 1934.

Days at or above 30 C (86 F) per year at Idaho City
Year	Days	Decade average
1895	47	47
1922	74	68.6
1923	57	68.6
1924	71	68.6
1925	63	68.6
1926	73	68.6
1927	66	68.6
1928	73	68.6
1929	72	68.6
1930	55	77.9
1931	83	77.9
1932	73	77.9
1933	86	77.9
1934	92	77.9
1935	68	77.9
1936	87	77.9
1937	77	77.9
1938	77	77.9
1939	81	77.9
1940	89	62.8
1941	50	62.8
1942	62	62.8
1943	66	62.8
1944	52	62.8
1945	63	62.8
1946	62	62.8
1947	64	62.8
1948	51	62.8
1949	69	62.8
1950	50	51.7
1951	39	51.7
1952	53	51.7
1953	59	51.7
1954	54	51.7
1955	62	51.7
1956	49	51.7
1957	52	51.7
1958	54	51.7
1959	45	51.7
1960	52	50.6
1961	68	50.6
1962	34	50.6
1963	41	50.6
1964	39	50.6
1965	32	50.6
1966	69	50.6
1967	71	50.6
1968	45	50.6
1969	55	50.6
1970	62	46.5
1971	49	46.5
1972	45	46.5
1973	57	46.5
1974	55	46.5
1975	34	46.5
1976	33	46.5
1977	42	46.5
1978	29	46.5
1979	59	46.5
1980	24	51.9
1981	70	51.9
1982	41	51.9
1983	45	51.9
1984	62	51.9
1985	49	51.9
1986	60	51.9
1987	58	51.9
1988	66	51.9
1989	44	51.9
1990	62	49.3
1991	57	49.3
1992	49	49.3
1993	22	49.3
1994	70	49.3
1995	35	49.3
1996	49	49.3
1997	35	49.3
1998	64	49.3
1999	50	49.3
2000	51	53.9
2001	64	53.9
2002	52	53.9
2003	60	53.9
2004	39	53.9
2006	59	53.9
2009	52	53.9
2010	35	47.7
2011	49	47.7
2012	59	47.7

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

First to last qualifying date each year at Idaho City
Year	First date	Last date
1895	1895-06-23	1895-10-01
1922	1922-06-12	1922-10-09
1923	1923-05-24	1923-09-13
1924	1924-05-12	1924-09-29
1925	1925-06-18	1925-09-26
1926	1926-04-15	1926-09-09
1927	1927-04-25	1927-10-20
1928	1928-05-08	1928-09-25
1929	1929-05-21	1929-09-18
1930	1930-05-27	1930-09-18
1931	1931-05-12	1931-09-17
1932	1932-05-12	1932-10-02
1933	1933-05-29	1933-10-07
1934	1934-04-20	1934-10-11
1935	1935-06-07	1935-10-02
1936	1936-05-10	1936-10-08
1937	1937-05-13	1937-09-19
1938	1938-05-25	1938-09-27
1939	1939-04-28	1939-09-24
1940	1940-05-10	1940-09-12
1941	1941-05-11	1941-09-17
1942	1942-05-21	1942-10-09
1943	1943-06-17	1943-10-03
1944	1944-05-14	1944-09-13
1945	1945-06-20	1945-09-15
1946	1946-06-22	1946-09-25
1947	1947-05-01	1947-09-25
1948	1948-05-26	1948-09-14
1949	1949-05-14	1949-09-27
1950	1950-06-28	1950-09-08
1951	1951-06-15	1951-09-16
1952	1952-06-09	1952-10-08
1953	1953-06-11	1953-09-21
1954	1954-05-15	1954-09-26
1955	1955-06-07	1955-09-11
1956	1956-05-22	1956-09-19
1957	1957-06-02	1957-09-30
1958	1958-05-20	1958-09-10
1959	1959-05-13	1959-09-12
1960	1960-06-24	1960-09-27
1961	1961-05-25	1961-08-28
1962	1962-06-24	1962-09-25
1963	1963-07-01	1963-10-03
1964	1964-05-16	1964-08-25
1965	1965-06-09	1965-08-18
1966	1966-05-03	1966-09-23
1967	1967-05-22	1967-09-29
1968	1968-06-17	1968-09-11
1969	1969-06-03	1969-09-09
1970	1970-06-03	1970-09-01
1971	1971-06-21	1971-08-30
1972	1972-05-29	1972-09-04
1973	1973-05-16	1973-09-13
1974	1974-06-11	1974-09-07
1975	1975-07-02	1975-09-09
1976	1976-06-28	1976-09-06
1977	1977-06-01	1977-09-08
1978	1978-06-28	1978-09-26
1979	1979-06-10	1979-10-08
1980	1980-05-21	1980-10-03
1981	1981-06-24	1981-09-19
1982	1982-06-19	1982-09-09
1983	1983-05-23	1983-09-25
1984	1984-05-29	1984-09-20
1985	1985-05-02	1985-08-30
1986	1986-05-26	1986-09-08
1987	1987-04-28	1987-10-03
1988	1988-05-13	1988-10-05
1989	1989-06-09	1989-09-30
1990	1990-06-10	1990-09-23
1991	1991-06-11	1991-09-27
1992	1992-05-07	1992-10-02
1993	1993-05-13	1993-10-05
1994	1994-06-12	1994-09-29
1995	1995-06-26	1995-09-16
1996	1996-06-08	1996-09-13
1997	1997-05-16	1997-10-02
1998	1998-06-30	1998-09-18
1999	1999-05-24	1999-09-23
2000	2000-06-05	2000-09-17
2001	2001-05-13	2001-10-02
2002	2002-05-20	2002-09-16
2003	2003-05-24	2003-09-05
2004	2004-06-04	2004-09-01
2006	2006-05-16	2006-09-13
2009	2009-05-19	2009-09-29
2010	2010-06-29	2010-10-03
2011	2011-06-23	2011-10-01
2012	2012-06-05	2012-09-15

Every Fixed Threshold

Fixed thresholds at Idaho City
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	89	92	1934	59
35 C (95 F): Days	88	37	1933	14
40 C (104 F): Days	15	5	1933	1
90 F (32.2 C): Days	89	71	1940	39
100 F (37.8 C): Days	46	16	1933	1
0 C (32 F): Ice days (max	89	62	1985	26
0 C (32 F): Frost days (min	88	251	1933	228
-10 C (14 F): Days with min	88	102	1985	57
-20 C (-4 F): Days with min	83	34	1949	10
-30 C (-22 F): Days with min	24	10	1949	3
20 C (68 F): Tropical nights (min	1	1	1924	1
10 mm (0.39 in): Days with 10 mm or more rain	88	35	1983	14
25 mm (0.98 in): Days with 25 mm or more rain	76	7	1926	4
50 mm (1.97 in): Days with 50 mm or more rain	10	2	1932	1
10 cm (3.9 in): Days with 10 cm or more snowfall	73	15	1951	7
25 cm (9.8 in): Days with 25 cm or more snowfall	42	6	1936	2
50 cm (19.7 in): Days with 50 cm or more snowfall	1	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 1895.

Download the Data

Data for Idaho City 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

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

Idaho City Threshold Days by Year

Key Facts for Idaho City Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related