Basin Threshold Days by Year (USC00480540)

19 fixed thresholds counted per year at Basin (USC00480540): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Basin Thresholds

Basin: days with a maximum temperature at or above 30 C (86 F) in 104 years, most in 1913 with 109.
Basin: days with a maximum temperature at or above 35 C (95 F) in 104 years, most in 1914 with 53.
Basin: days with a maximum temperature at or above 90 F (32.2 C) in 104 years, most in 1913 with 81.
Basin: days with a maximum temperature at or below 0 C (32 F) in 104 years, most in 1978 with 101.
19 fixed thresholds have at least one qualifying day at Basin.

Days at or above 30 C (86 F)

104 years with a qualifying day

Days per year at Basin with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 109 in 1913.

Days at or above 30 C (86 F) per year at Basin
Year	Days	Decade average
1899	66	66
1900	74	70.8
1902	63	70.8
1904	66	70.8
1905	80	70.8
1911	76	90.8
1913	109	90.8
1914	92	90.8
1919	86	90.8
1921	68	67.4
1922	93	67.4
1923	61	67.4
1924	67	67.4
1925	74	67.4
1926	62	67.4
1927	49	67.4
1928	56	67.4
1929	77	67.4
1930	66	79.7
1931	82	79.7
1932	75	79.7
1933	87	79.7
1934	87	79.7
1935	69	79.7
1936	94	79.7
1937	78	79.7
1938	79	79.7
1939	80	79.7
1940	76	64.5
1949	53	64.5
1950	52	73.4
1951	48	73.4
1952	78	73.4
1953	90	73.4
1954	78	73.4
1955	77	73.4
1956	88	73.4
1957	69	73.4
1958	69	73.4
1959	85	73.4
1960	81	70.4
1961	79	70.4
1962	59	70.4
1963	77	70.4
1964	66	70.4
1965	51	70.4
1966	84	70.4
1967	72	70.4
1968	60	70.4
1969	75	70.4
1970	82	74.6
1971	79	74.6
1972	66	74.6
1973	74	74.6
1974	80	74.6
1975	71	74.6
1976	79	74.6
1977	71	74.6
1978	66	74.6
1979	78	74.6
1980	72	73.4
1981	91	73.4
1982	72	73.4
1985	65	73.4
1986	65	73.4
1987	60	73.4
1988	89	73.4
1989	73	73.4
1990	69	60.7
1991	67	60.7
1992	49	60.7
1993	27	60.7
1994	71	60.7
1995	60	60.7
1996	73	60.7
1997	64	60.7
1998	69	60.7
1999	58	60.7
2000	76	70.8
2001	89	70.8
2002	67	70.8
2003	80	70.8
2004	51	70.8
2005	60	70.8
2006	80	70.8
2007	83	70.8
2008	63	70.8
2009	59	70.8
2010	58	76
2011	71	76
2012	87	76
2013	87	76
2014	56	76
2015	81	76
2016	88	76
2017	82	76
2018	80	76
2019	70	76
2020	86	76.2
2021	91	76.2
2022	82	76.2
2023	62	76.2
2024	80	76.2
2026	56	76.2

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

First to last qualifying date each year at Basin
Year	First date	Last date
1899	1899-05-11	1899-09-30
1900	1900-05-10	1900-09-13
1902	1902-05-07	1902-09-15
1904	1904-05-18	1904-09-20
1905	1905-05-17	1905-09-28
1911	1911-05-05	1911-09-13
1913	1913-05-25	1913-10-02
1914	1914-05-29	1914-09-23
1919	1919-05-20	1919-09-17
1921	1921-06-10	1921-09-25
1922	1922-05-26	1922-10-03
1923	1923-05-25	1923-09-09
1924	1924-06-10	1924-09-23
1925	1925-05-19	1925-09-16
1926	1926-04-30	1926-09-20
1927	1927-04-27	1927-10-17
1928	1928-05-05	1928-09-18
1929	1929-05-22	1929-09-20
1930	1930-05-27	1930-09-21
1931	1931-05-14	1931-09-18
1932	1932-05-12	1932-09-17
1933	1933-05-30	1933-09-29
1934	1934-05-06	1934-09-12
1935	1935-06-08	1935-09-22
1936	1936-05-04	1936-09-22
1937	1937-05-17	1937-09-20
1938	1938-05-27	1938-09-30
1939	1939-04-28	1939-09-21
1940	1940-06-01	1940-09-13
1949	1949-05-12	1949-09-24
1950	1950-05-22	1950-10-15
1951	1951-05-23	1951-09-10
1952	1952-05-02	1952-09-27
1953	1953-05-27	1953-10-01
1954	1954-05-19	1954-10-08
1955	1955-05-20	1955-09-14
1956	1956-05-17	1956-09-27
1957	1957-05-03	1957-10-01
1958	1958-05-11	1958-09-22
1959	1959-06-03	1959-09-14
1960	1960-05-11	1960-09-20
1961	1961-05-20	1961-09-16
1962	1962-04-19	1962-09-18
1963	1963-06-13	1963-10-04
1964	1964-05-16	1964-09-17
1965	1965-06-09	1965-08-28
1966	1966-05-04	1966-09-23
1967	1967-05-22	1967-09-29
1968	1968-06-02	1968-09-13
1969	1969-04-22	1969-09-28
1970	1970-05-17	1970-10-04
1971	1971-05-27	1971-09-14
1972	1972-05-15	1972-09-18
1973	1973-05-16	1973-09-07
1974	1974-04-24	1974-09-26
1975	1975-05-15	1975-10-06
1976	1976-05-14	1976-09-17
1977	1977-05-09	1977-09-14
1978	1978-05-15	1978-09-27
1979	1979-05-16	1979-09-25
1980	1980-04-19	1980-09-30
1981	1981-05-01	1981-09-18
1982	1982-05-22	1982-09-09
1985	1985-05-03	1985-09-15
1986	1986-05-21	1986-08-31
1987	1987-04-29	1987-09-27
1988	1988-05-14	1988-09-10
1989	1989-04-22	1989-10-01
1990	1990-05-07	1990-09-26
1991	1991-05-21	1991-10-17
1992	1992-05-07	1992-10-04
1993	1993-05-14	1993-09-12
1994	1994-05-23	1994-09-29
1995	1995-06-03	1995-09-15
1996	1996-06-08	1996-09-14
1997	1997-06-01	1997-10-03
1998	1998-05-27	1998-09-19
1999	1999-05-29	1999-09-18
2000	2000-04-29	2000-09-19
2001	2001-05-12	2001-10-02
2002	2002-05-19	2002-09-16
2003	2003-05-24	2003-10-09
2004	2004-05-04	2004-09-18
2005	2005-05-20	2005-10-01
2006	2006-05-16	2006-09-13
2007	2007-04-29	2007-09-22
2008	2008-05-18	2008-09-25
2009	2009-05-18	2009-09-29
2010	2010-05-27	2010-10-03
2011	2011-06-05	2011-10-02
2012	2012-04-23	2012-09-15
2013	2013-05-13	2013-09-22
2014	2014-05-27	2014-09-27
2015	2015-06-02	2015-10-11
2016	2016-04-23	2016-10-02
2017	2017-05-06	2017-09-14
2018	2018-04-29	2018-10-03
2019	2019-05-15	2019-09-17
2020	2020-05-18	2020-10-11
2021	2021-05-01	2021-09-30
2022	2022-05-27	2022-09-28
2023	2023-05-03	2023-09-29
2024	2024-05-18	2024-10-05
2026	2026-03-21	2026-10-12

Every Fixed Threshold

Fixed thresholds at Basin
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	104	109	1913	56
35 C (95 F): Days	104	53	1914	27
40 C (104 F): Days	47	13	1900	4
90 F (32.2 C): Days	104	81	1913	44
100 F (37.8 C): Days	95	27	1900	13
110 F (43.3 C): Days	4	2	1900	1
0 C (32 F): Ice days (max	104	101	1978	11
0 C (32 F): Frost days (min	104	208	1913	96
-10 C (14 F): Days with min	104	124	1978	19
-20 C (-4 F): Days with min	104	59	1978	3
-30 C (-22 F): Days with min	66	17	1932	3
-40 C (-40 F): Days with min	11	4	1899	1
20 C (68 F): Tropical nights (min	42	17	1900	5
25 C (77 F): Days with min	6	3	1902	1
10 mm (0.39 in): Days with 10 mm or more rain	91	9	1932	1
25 mm (0.98 in): Days with 25 mm or more rain	23	3	1932	2
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1988	1
10 cm (3.9 in): Days with 10 cm or more snowfall	50	5	1966	2
25 cm (9.8 in): Days with 25 cm or more snowfall	5	1	1934	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1899.

Download the Data

Data for Basin 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).

Basin Threshold Days by Year (USC00480540)

Key Facts for Basin Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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