Boise City 2 E Threshold Days by Year

18 fixed thresholds counted per year at Boise City 2 E (USC00340908): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boise City 2 E Thresholds

Boise City 2 E: nights with a minimum temperature at or below 0 C (32 F) in 96 years, most in 1912 with 159.
Boise City 2 E: nights with a minimum temperature at or below -10 C (14 F) in 96 years, most in 1911 with 51.
Boise City 2 E: days with a maximum temperature at or above 30 C (86 F) in 93 years, most in 1956 with 140.
Boise City 2 E: days with a maximum temperature at or above 35 C (95 F) in 93 years, most in 2011 with 74.
18 fixed thresholds have at least one qualifying day at Boise City 2 E.

Days at or above 30 C (86 F)

93 years with a qualifying day

Days per year at Boise City 2 E with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 140 in 1956.

Days at or above 30 C (86 F) per year at Boise City 2 E
Year	Days	Decade average
1908	101	96
1909	91	96
1910	105	90.1
1911	105	90.1
1912	81	90.1
1913	102	90.1
1914	105	90.1
1915	70	90.1
1916	92	90.1
1917	71	90.1
1918	86	90.1
1919	84	90.1
1920	70	76.6
1921	82	76.6
1922	90	76.6
1923	61	76.6
1924	80	76.6
1930	93	94.3
1931	98	94.3
1932	59	94.3
1934	107	94.3
1935	96	94.3
1936	98	94.3
1937	105	94.3
1938	90	94.3
1939	103	94.3
1940	83	80.9
1941	59	80.9
1942	79	80.9
1943	103	80.9
1944	72	80.9
1945	94	80.9
1946	88	80.9
1949	69	80.9
1950	61	101.2
1954	118	101.2
1955	82	101.2
1956	140	101.2
1959	105	101.2
1960	97	107.1
1961	99	107.1
1962	114	107.1
1963	135	107.1
1964	114	107.1
1965	98	107.1
1966	111	107.1
1967	103	107.1
1968	103	107.1
1969	97	107.1
1970	104	96.5
1971	101	96.5
1972	97	96.5
1973	92	96.5
1974	97	96.5
1975	98	96.5
1976	90	96.5
1977	101	96.5
1978	100	96.5
1979	85	96.5
1980	113	94
1981	105	94
1982	90	94
1985	99	94
1986	91	94
1987	79	94
1988	82	94
1989	93	94
1990	102	96
1991	93	96
1992	87	96
1993	91	96
1994	102	96
1995	94	96
1996	87	96
1997	97	96
1998	119	96
1999	88	96
2000	126	100.8
2003	98	100.8
2004	94	100.8
2005	102	100.8
2006	103	100.8
2007	98	100.8
2008	92	100.8
2009	93	100.8
2010	117	108.6
2011	124	108.6
2012	119	108.6
2013	106	108.6
2014	98	108.6
2015	99	108.6
2016	108	108.6
2017	98	108.6

For each year, a bar from the first to the last day at Boise City 2 E meeting 30 C (86 F).

First to last qualifying date each year at Boise City 2 E
Year	First date	Last date
1908	1908-05-15	1908-09-25
1909	1909-05-07	1909-10-30
1910	1910-03-28	1910-10-07
1911	1911-05-06	1911-10-02
1912	1912-04-22	1912-09-08
1913	1913-04-30	1913-09-22
1914	1914-04-16	1914-10-02
1915	1915-05-12	1915-09-28
1916	1916-04-11	1916-10-04
1917	1917-04-26	1917-10-06
1918	1918-05-06	1918-09-23
1919	1919-05-18	1919-09-14
1920	1920-05-24	1920-09-24
1921	1921-05-28	1921-10-06
1922	1922-05-19	1922-10-04
1923	1923-05-10	1923-09-27
1924	1924-06-04	1924-10-01
1930	1930-04-09	1930-10-10
1931	1931-04-07	1931-10-10
1932	1932-05-13	1932-10-07
1934	1934-04-29	1934-10-07
1935	1935-05-11	1935-10-12
1936	1936-04-28	1936-10-12
1937	1937-04-16	1937-10-27
1938	1938-04-30	1938-10-03
1939	1939-04-22	1939-10-23
1940	1940-05-03	1940-10-18
1941	1941-05-13	1941-09-15
1942	1942-04-04	1942-10-08
1943	1943-04-03	1943-10-28
1944	1944-05-14	1944-09-22
1945	1945-04-09	1945-10-27
1946	1946-03-31	1946-10-26
1949	1949-05-03	1949-10-04
1950	1950-04-21	1950-10-31
1954	1954-04-06	1954-10-04
1955	1955-04-17	1955-10-15
1956	1956-03-25	1956-10-13
1959	1959-04-05	1959-10-25
1960	1960-04-19	1960-09-15
1961	1961-04-18	1961-10-07
1962	1962-04-20	1962-10-14
1963	1963-03-28	1963-10-12
1964	1964-04-16	1964-10-17
1965	1965-04-20	1965-10-30
1966	1966-05-06	1966-10-13
1967	1967-04-04	1967-10-14
1968	1968-05-02	1968-10-30
1969	1969-05-01	1969-10-03
1970	1970-05-10	1970-10-06
1971	1971-03-27	1971-10-14
1972	1972-04-06	1972-10-17
1973	1973-05-10	1973-10-03
1974	1974-04-25	1974-09-26
1975	1975-05-18	1975-10-22
1976	1976-05-28	1976-09-23
1977	1977-05-06	1977-10-01
1978	1978-05-14	1978-10-11
1979	1979-04-15	1979-10-27
1980	1980-04-20	1980-11-08
1981	1981-04-10	1981-09-30
1982	1982-04-12	1982-09-27
1985	1985-05-04	1985-09-18
1986	1986-04-23	1986-09-22
1987	1987-04-17	1987-10-09
1988	1988-04-08	1988-10-23
1989	1989-03-10	1989-10-15
1990	1990-05-18	1990-10-05
1991	1991-04-07	1991-10-18
1992	1992-04-30	1992-10-14
1993	1993-05-14	1993-10-07
1994	1994-04-17	1994-09-29
1995	1995-03-21	1995-10-18
1996	1996-04-24	1996-10-14
1997	1997-05-17	1997-10-06
1998	1998-04-24	1998-10-15
1999	1999-04-20	1999-10-13
2000	2000-04-14	2000-10-04
2003	2003-04-14	2003-10-30
2004	2004-05-05	2004-09-18
2005	2005-05-19	2005-10-18
2006	2006-04-10	2006-11-08
2007	2007-05-14	2007-10-20
2008	2008-04-15	2008-09-26
2009	2009-04-24	2009-10-19
2010	2010-03-30	2010-10-07
2011	2011-04-02	2011-10-03
2012	2012-03-25	2012-10-11
2013	2013-04-29	2013-10-02
2014	2014-04-12	2014-11-28
2015	2015-06-02	2015-11-04
2016	2016-05-24	2016-10-28
2017	2017-02-10	2017-09-23

Every Fixed Threshold

Fixed thresholds at Boise City 2 E
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	93	140	1956	98
35 C (95 F): Days	93	74	2011	26
40 C (104 F): Days	38	7	1913	1
90 F (32.2 C): Days	93	117	1956	55
100 F (37.8 C): Days	85	32	2011	3
0 C (32 F): Ice days (max	93	33	1978	3
0 C (32 F): Frost days (min	96	159	1912	99
-10 C (14 F): Days with min	96	51	1911	8
-20 C (-4 F): Days with min	61	7	1912	1
-30 C (-22 F): Days with min	1	1	1959	1
20 C (68 F): Tropical nights (min	88	33	1934	3
25 C (77 F): Days with min	5	2	1913	2
10 mm (0.39 in): Days with 10 mm or more rain	86	28	1909	24
25 mm (0.98 in): Days with 25 mm or more rain	84	13	1941	8
50 mm (1.97 in): Days with 50 mm or more rain	32	4	1998	3
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1950	1
10 cm (3.9 in): Days with 10 cm or more snowfall	55	7	1987	5
25 cm (9.8 in): Days with 25 cm or more snowfall	12	2	1990	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1908.

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Data for Boise City 2 E 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).

Boise City 2 E Threshold Days by Year

Key Facts for Boise City 2 E Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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