Imperial Threshold Days by Year (USC00254110)

20 fixed thresholds counted per year at Imperial (USC00254110): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Imperial Thresholds

Imperial: nights with a minimum temperature at or below 0 C (32 F) in 126 years, most in 1905 with 185.
Imperial: nights with a minimum temperature at or below -10 C (14 F) in 126 years, most in 1895 with 72.
Imperial: days with a maximum temperature at or above 30 C (86 F) in 124 years, most in 1934 with 103.
Imperial: days with a maximum temperature at or above 90 F (32.2 C) in 124 years, most in 1934 with 88.
20 fixed thresholds have at least one qualifying day at Imperial.

Days at or above 30 C (86 F)

124 years with a qualifying day

Days per year at Imperial with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 103 in 1934.

Days at or above 30 C (86 F) per year at Imperial
Year	Days	Decade average
1895	65	81.3
1897	93	81.3
1898	80	81.3
1899	87	81.3
1900	90	61.8
1901	76	61.8
1902	56	61.8
1903	62	61.8
1904	14	61.8
1905	54	61.8
1906	64	61.8
1907	66	61.8
1908	57	61.8
1909	79	61.8
1910	86	61
1911	95	61
1912	48	61
1913	85	61
1914	70	61
1915	12	61
1916	73	61
1917	43	61
1918	37	61
1920	51	68.3
1921	89	68.3
1922	87	68.3
1923	62	68.3
1925	76	68.3
1926	69	68.3
1927	63	68.3
1928	47	68.3
1929	71	68.3
1930	60	86.6
1931	93	86.6
1932	81	86.6
1933	88	86.6
1934	103	86.6
1935	71	86.6
1936	98	86.6
1937	87	86.6
1938	87	86.6
1939	98	86.6
1940	83	74
1941	78	74
1943	83	74
1944	75	74
1945	60	74
1946	64	74
1947	77	74
1948	80	74
1949	66	74
1950	62	76.3
1951	45	76.3
1952	86	76.3
1953	92	76.3
1954	88	76.3
1955	85	76.3
1956	90	76.3
1957	66	76.3
1958	63	76.3
1959	86	76.3
1960	75	71.3
1961	69	71.3
1962	65	71.3
1963	92	71.3
1964	87	71.3
1965	50	71.3
1966	71	71.3
1967	54	71.3
1968	80	71.3
1969	70	71.3
1970	91	77.4
1971	69	77.4
1972	65	77.4
1973	71	77.4
1974	67	77.4
1975	75	77.4
1976	81	77.4
1977	86	77.4
1978	87	77.4
1979	82	77.4
1980	89	78.1
1981	67	78.1
1982	57	78.1
1983	86	78.1
1984	88	78.1
1985	80	78.1
1986	80	78.1
1987	84	78.1
1988	87	78.1
1989	63	78.1
1990	62	60.6
1991	76	60.6
1992	43	60.6
1993	42	60.6
1994	79	60.6
1995	67	60.6
1996	46	60.6
1997	64	60.6
1998	69	60.6
1999	58	60.6
2000	81	68.7
2001	79	68.7
2002	74	68.7
2003	71	68.7
2006	65	68.7
2007	69	68.7
2008	42	68.7
2010	52	69.4
2011	59	69.4
2012	92	69.4
2013	74	69.4
2014	60	69.4
2015	70	69.4
2016	68	69.4
2017	78	69.4
2018	72	69.4
2020	98	87.6
2021	91	87.6
2022	95	87.6
2023	73	87.6
2024	90	87.6
2025	68	87.6
2026	98	87.6

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

First to last qualifying date each year at Imperial
Year	First date	Last date
1895	1895-03-28	1895-09-20
1897	1897-04-26	1897-10-07
1898	1898-04-15	1898-10-01
1899	1899-04-12	1899-10-01
1900	1900-05-10	1900-10-05
1901	1901-04-25	1901-09-26
1902	1902-04-20	1902-10-20
1903	1903-05-17	1903-10-02
1904	1904-05-24	1904-10-03
1905	1905-06-03	1905-10-07
1906	1906-04-23	1906-10-12
1907	1907-03-21	1907-10-06
1908	1908-04-13	1908-10-15
1909	1909-05-04	1909-10-06
1910	1910-03-21	1910-10-17
1911	1911-05-08	1911-09-28
1912	1912-05-19	1912-10-04
1913	1913-04-29	1913-10-13
1914	1914-05-09	1914-10-03
1915	1915-05-13	1915-10-10
1916	1916-04-10	1916-09-30
1917	1917-03-30	1917-09-22
1918	1918-06-10	1918-08-28
1920	1920-07-16	1920-10-10
1921	1921-05-20	1921-10-21
1922	1922-05-10	1922-10-26
1923	1923-04-30	1923-09-23
1925	1925-05-19	1925-09-28
1926	1926-05-01	1926-10-17
1927	1927-05-01	1927-10-26
1928	1928-05-01	1928-10-10
1929	1929-04-04	1929-09-22
1930	1930-04-08	1930-09-23
1931	1931-05-07	1931-10-26
1932	1932-04-21	1932-10-06
1933	1933-05-17	1933-09-29
1934	1934-04-22	1934-10-07
1935	1935-06-09	1935-09-24
1936	1936-05-03	1936-10-12
1937	1937-05-19	1937-10-29
1938	1938-05-26	1938-10-16
1939	1939-04-22	1939-10-02
1940	1940-05-11	1940-10-18
1941	1941-05-13	1941-09-20
1943	1943-03-29	1943-10-28
1944	1944-05-13	1944-10-13
1945	1945-05-19	1945-09-22
1946	1946-04-17	1946-10-02
1947	1947-05-03	1947-10-21
1948	1948-04-17	1948-09-25
1949	1949-04-25	1949-09-26
1950	1950-04-22	1950-10-30
1951	1951-05-28	1951-10-01
1952	1952-05-04	1952-09-30
1953	1953-04-27	1953-10-10
1954	1954-04-06	1954-10-08
1955	1955-04-26	1955-10-19
1956	1956-05-08	1956-10-12
1957	1957-06-04	1957-09-30
1958	1958-05-21	1958-10-19
1959	1959-05-01	1959-10-25
1960	1960-04-19	1960-10-04
1961	1961-05-28	1961-10-06
1962	1962-04-19	1962-10-14
1963	1963-03-28	1963-10-06
1964	1964-04-16	1964-10-16
1965	1965-04-22	1965-10-09
1966	1966-05-04	1966-10-02
1967	1967-03-29	1967-10-12
1968	1968-04-30	1968-10-29
1969	1969-05-25	1969-09-28
1970	1970-05-06	1970-10-05
1971	1971-06-15	1971-09-14
1972	1972-05-16	1972-10-02
1973	1973-05-18	1973-09-10
1974	1974-05-19	1974-09-26
1975	1975-04-26	1975-10-22
1976	1976-05-19	1976-10-01
1977	1977-04-10	1977-10-26
1978	1978-03-30	1978-10-01
1979	1979-05-05	1979-10-07
1980	1980-04-20	1980-10-09
1981	1981-04-25	1981-09-29
1982	1982-04-11	1982-09-22
1983	1983-05-24	1983-10-27
1984	1984-05-12	1984-09-21
1985	1985-04-15	1985-09-19
1986	1986-04-23	1986-09-21
1987	1987-04-17	1987-10-04
1988	1988-05-12	1988-09-26
1989	1989-04-20	1989-10-13
1990	1990-05-07	1990-10-05
1991	1991-04-06	1991-10-17
1992	1992-04-30	1992-10-13
1993	1993-05-27	1993-10-06
1994	1994-04-17	1994-09-29
1995	1995-06-07	1995-10-17
1996	1996-04-03	1996-10-14
1997	1997-05-07	1997-10-03
1998	1998-05-14	1998-09-29
1999	1999-05-10	1999-10-15
2000	2000-05-05	2000-09-19
2001	2001-04-30	2001-10-03
2002	2002-04-16	2002-09-09
2003	2003-04-15	2003-10-23
2006	2006-04-11	2006-10-08
2007	2007-04-30	2007-10-07
2008	2008-04-16	2008-09-29
2010	2010-04-29	2010-09-23
2011	2011-04-03	2011-10-05
2012	2012-03-27	2012-10-04
2013	2013-04-29	2013-10-01
2014	2014-05-20	2014-09-27
2015	2015-03-17	2015-10-12
2016	2016-05-07	2016-10-15
2017	2017-03-20	2017-09-23
2018	2018-04-30	2018-10-04
2020	2020-05-01	2020-10-10
2021	2021-04-05	2021-10-27
2022	2022-04-23	2022-10-12
2023	2023-04-12	2023-10-21
2024	2024-04-14	2024-10-11
2025	2025-05-13	2025-10-12
2026	2026-03-20	2026-10-11

Every Fixed Threshold

Fixed thresholds at Imperial
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	124	103	1934	98
35 C (95 F): Days	123	60	1934	19
40 C (104 F): Days	59	19	1936	2
45 C (113 F): Days	3	1	1925	1
90 F (32.2 C): Days	124	88	1934	63
100 F (37.8 C): Days	115	39	1934	5
110 F (43.3 C): Days	8	3	1925	1
0 C (32 F): Ice days (max	124	52	1915	5
0 C (32 F): Frost days (min	126	185	1905	83
-10 C (14 F): Days with min	126	72	1895	18
-20 C (-4 F): Days with min	119	23	1916	1
-30 C (-22 F): Days with min	22	3	1899	1
20 C (68 F): Tropical nights (min	116	28	1898	2
25 C (77 F): Days with min	6	6	1898	1
10 mm (0.39 in): Days with 10 mm or more rain	120	30	1905	10
25 mm (0.98 in): Days with 25 mm or more rain	117	15	1915	4
50 mm (1.97 in): Days with 50 mm or more rain	68	3	1915	1
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1971	1
10 cm (3.9 in): Days with 10 cm or more snowfall	79	9	1931	1
25 cm (9.8 in): Days with 25 cm or more snowfall	10	1	1930	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 Imperial 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).

Imperial Threshold Days by Year (USC00254110)

Key Facts for Imperial Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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