Plain Threshold Days by Year (USC00456534)

18 fixed thresholds counted per year at Plain (USC00456534): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Plain Thresholds

Plain: days with a maximum temperature at or above 30 C (86 F) in 76 years, most in 1945 with 47.
Plain: days with a maximum temperature at or above 90 F (32.2 C) in 76 years, most in 2021 with 34.
Plain: days with a maximum temperature at or below 0 C (32 F) in 76 years, most in 1985 with 68.
Plain: nights with a minimum temperature at or below 0 C (32 F) in 76 years, most in 1950 with 209.
18 fixed thresholds have at least one qualifying day at Plain.

Days at or above 30 C (86 F)

76 years with a qualifying day

Days per year at Plain with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 47 in 1945.

Days at or above 30 C (86 F) per year at Plain
Year	Days	Decade average
1939	36	36
1940	27	33.9
1941	37	33.9
1942	44	33.9
1944	44	33.9
1945	47	33.9
1946	26	33.9
1948	21	33.9
1949	25	33.9
1950	38	23.5
1952	29	23.5
1953	20	23.5
1954	10	23.5
1955	29	23.5
1956	31	23.5
1957	12	23.5
1959	19	23.5
1966	29	31
1969	33	31
1970	33	31.9
1971	38	31.9
1972	26	31.9
1973	38	31.9
1974	38	31.9
1975	18	31.9
1976	15	31.9
1977	36	31.9
1978	35	31.9
1979	42	31.9
1980	21	29.3
1981	42	29.3
1982	35	29.3
1983	21	29.3
1984	24	29.3
1985	33	29.3
1986	37	29.3
1987	36	29.3
1988	30	29.3
1989	14	29.3
1990	35	26.2
1991	23	26.2
1992	33	26.2
1993	17	26.2
1994	28	26.2
1995	16	26.2
1996	28	26.2
1997	20	26.2
1998	41	26.2
1999	21	26.2
2000	16	30
2001	27	30
2002	29	30
2003	38	30
2004	36	30
2005	24	30
2006	42	30
2007	26	30
2008	21	30
2009	41	30
2010	20	31.9
2011	23	31.9
2012	31	31.9
2013	40	31.9
2014	34	31.9
2015	38	31.9
2016	31	31.9
2017	47	31.9
2018	36	31.9
2019	19	31.9
2020	34	39.1
2021	44	39.1
2022	43	39.1
2023	41	39.1
2024	39	39.1
2025	39	39.1
2026	34	39.1

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

First to last qualifying date each year at Plain
Year	First date	Last date
1939	1939-05-14	1939-09-21
1940	1940-06-10	1940-09-11
1941	1941-05-23	1941-08-26
1942	1942-06-29	1942-09-26
1944	1944-05-27	1944-09-12
1945	1945-05-30	1945-10-08
1946	1946-06-19	1946-08-24
1948	1948-06-06	1948-09-11
1949	1949-05-08	1949-09-08
1950	1950-07-01	1950-09-09
1952	1952-07-03	1952-09-25
1953	1953-06-11	1953-09-11
1954	1954-05-17	1954-08-13
1955	1955-06-09	1955-09-10
1956	1956-05-17	1956-09-17
1957	1957-05-29	1957-09-15
1959	1959-06-19	1959-09-12
1966	1966-05-03	1966-09-22
1969	1969-06-03	1969-09-12
1970	1970-06-02	1970-08-23
1971	1971-06-21	1971-08-30
1972	1972-05-29	1972-09-04
1973	1973-05-14	1973-09-11
1974	1974-06-10	1974-09-25
1975	1975-06-01	1975-09-14
1976	1976-06-28	1976-09-21
1977	1977-04-24	1977-09-13
1978	1978-06-02	1978-08-29
1979	1979-06-01	1979-10-05
1980	1980-07-01	1980-10-06
1981	1981-06-25	1981-09-18
1982	1982-05-24	1982-09-02
1983	1983-05-23	1983-08-13
1984	1984-05-29	1984-09-17
1985	1985-06-11	1985-08-29
1986	1986-05-25	1986-09-04
1987	1987-05-07	1987-09-24
1988	1988-06-16	1988-09-14
1989	1989-06-25	1989-09-23
1990	1990-06-22	1990-09-24
1991	1991-07-02	1991-09-30
1992	1992-05-05	1992-08-19
1993	1993-05-11	1993-09-10
1994	1994-06-22	1994-09-27
1995	1995-05-29	1995-09-16
1996	1996-07-08	1996-09-11
1997	1997-07-04	1997-09-02
1998	1998-06-30	1998-09-16
1999	1999-06-14	1999-08-27
2000	2000-06-26	2000-09-14
2001	2001-05-22	2001-09-15
2002	2002-06-14	2002-09-13
2003	2003-06-05	2003-09-05
2004	2004-06-20	2004-08-31
2005	2005-05-28	2005-08-21
2006	2006-05-16	2006-09-08
2007	2007-06-01	2007-09-14
2008	2008-05-17	2008-09-18
2009	2009-05-29	2009-09-23
2010	2010-07-07	2010-08-25
2011	2011-07-06	2011-09-25
2012	2012-05-15	2012-09-22
2013	2013-05-10	2013-09-16
2014	2014-06-24	2014-09-22
2015	2015-06-08	2015-09-13
2016	2016-06-05	2016-08-30
2017	2017-05-29	2017-09-08
2018	2018-05-16	2018-09-08
2019	2019-06-13	2019-09-06
2020	2020-05-30	2020-09-12
2021	2021-06-02	2021-09-08
2022	2022-06-27	2022-09-07
2023	2023-05-20	2023-09-17
2024	2024-06-24	2024-09-10
2025	2025-05-29	2025-09-20
2026	2026-05-29	2026-08-27

Every Fixed Threshold

Fixed thresholds at Plain
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	76	47	1945	34
35 C (95 F): Days	63	17	2015	4
40 C (104 F): Days	2	2	2021	2
90 F (32.2 C): Days	76	34	2021	20
100 F (37.8 C): Days	20	5	2021	1
0 C (32 F): Ice days (max	76	68	1985	11
0 C (32 F): Frost days (min	76	209	1950	99
-10 C (14 F): Days with min	76	54	1985	2
-20 C (-4 F): Days with min	46	21	1949	3
-30 C (-22 F): Days with min	5	8	1950	2
20 C (68 F): Tropical nights (min	5	3	2015	1
10 mm (0.39 in): Days with 10 mm or more rain	73	34	1955	6
25 mm (0.98 in): Days with 25 mm or more rain	68	11	1946	2
50 mm (1.97 in): Days with 50 mm or more rain	30	3	1946	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	2008	1
10 cm (3.9 in): Days with 10 cm or more snowfall	69	22	1948	3
25 cm (9.8 in): Days with 25 cm or more snowfall	52	8	1948	1
50 cm (19.7 in): Days with 50 cm or more snowfall	12	2	1946	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.

Download the Data

Data for Plain 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).

Plain Threshold Days by Year (USC00456534)

Key Facts for Plain Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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