On Threshold Days by Year (SWE00138938)

3 fixed thresholds counted per year at On (SWE00138938): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for On Thresholds

On: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 2023 with 31.
On: days with 25 mm (0.98 in) or more of precipitation in 57 years, most in 1979 with 6.
On: days with 50 mm (1.97 in) or more of precipitation in 8 years, most in 1963 with 1.
3 fixed thresholds have at least one qualifying day at On.

Days with 10 mm (0.39 in) or more of precipitation

66 years with a qualifying day

Days per year at On with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 31 in 2023.

Days with 10 mm (0.39 in) or more of precipitation per year at On
Year	Days	Decade average
1961	20	19.7
1962	20	19.7
1963	19	19.7
1964	15	19.7
1965	17	19.7
1966	25	19.7
1967	26	19.7
1968	18	19.7
1969	17	19.7
1970	20	19.5
1971	22	19.5
1972	17	19.5
1973	15	19.5
1974	22	19.5
1975	16	19.5
1976	13	19.5
1977	28	19.5
1978	18	19.5
1979	24	19.5
1980	23	21.4
1981	25	21.4
1982	20	21.4
1983	17	21.4
1984	22	21.4
1985	19	21.4
1986	21	21.4
1987	24	21.4
1988	27	21.4
1989	16	21.4
1990	22	19.6
1991	14	19.6
1992	21	19.6
1993	16	19.6
1994	19	19.6
1995	15	19.6
1996	17	19.6
1997	25	19.6
1998	21	19.6
1999	26	19.6
2000	30	21
2001	14	21
2002	27	21
2003	21	21
2004	23	21
2005	15	21
2006	24	21
2007	14	21
2008	21	21
2009	21	21
2010	18	18.8
2011	25	18.8
2012	25	18.8
2013	15	18.8
2014	23	18.8
2015	19	18.8
2016	12	18.8
2017	16	18.8
2018	13	18.8
2019	22	18.8
2020	15	19.6
2021	24	19.6
2022	15	19.6
2023	31	19.6
2024	22	19.6
2025	19	19.6
2026	11	19.6

For each year, a bar from the first to the last day at On meeting 10 mm (0.39 in).

First to last qualifying date each year at On
Year	First date	Last date
1961	1961-03-29	1961-12-03
1962	1962-01-11	1962-11-15
1963	1963-06-08	1963-12-18
1964	1964-04-29	1964-12-13
1965	1965-01-11	1965-12-18
1966	1966-01-01	1966-12-29
1967	1967-01-28	1967-12-22
1968	1968-01-17	1968-11-02
1969	1969-01-13	1969-11-23
1970	1970-01-01	1970-11-28
1971	1971-01-31	1971-12-27
1972	1972-01-19	1972-12-06
1973	1973-02-12	1973-12-06
1974	1974-01-14	1974-11-20
1975	1975-01-17	1975-12-23
1976	1976-01-05	1976-12-27
1977	1977-01-01	1977-12-24
1978	1978-01-29	1978-11-27
1979	1979-01-12	1979-12-28
1980	1980-02-10	1980-12-30
1981	1981-01-14	1981-11-27
1982	1982-02-06	1982-12-15
1983	1983-01-04	1983-12-30
1984	1984-01-07	1984-12-20
1985	1985-01-20	1985-12-06
1986	1986-01-02	1986-12-28
1987	1987-02-10	1987-12-22
1988	1988-01-02	1988-12-26
1989	1989-02-18	1989-11-07
1990	1990-01-15	1990-11-16
1991	1991-01-02	1991-10-17
1992	1992-04-01	1992-12-02
1993	1993-01-10	1993-12-23
1994	1994-01-05	1994-12-16
1995	1995-01-10	1995-09-29
1996	1996-05-05	1996-12-04
1997	1997-02-18	1997-12-31
1998	1998-05-09	1998-12-27
1999	1999-01-04	1999-12-24
2000	2000-01-29	2000-12-28
2001	2001-01-06	2001-12-05
2002	2002-01-22	2002-12-28
2003	2003-04-27	2003-12-28
2004	2004-01-11	2004-12-25
2005	2005-01-08	2005-12-06
2006	2006-01-20	2006-12-05
2007	2007-01-01	2007-12-07
2008	2008-01-18	2008-12-02
2009	2009-02-07	2009-12-25
2010	2010-02-25	2010-11-15
2011	2011-01-04	2011-12-29
2012	2012-01-01	2012-12-15
2013	2013-01-27	2013-12-27
2014	2014-01-09	2014-11-24
2015	2015-01-10	2015-12-04
2016	2016-02-10	2016-12-10
2017	2017-01-03	2017-12-25
2018	2018-01-31	2018-11-11
2019	2019-01-16	2019-12-17
2020	2020-01-14	2020-10-06
2021	2021-01-11	2021-11-02
2022	2022-02-14	2022-12-25
2023	2023-01-04	2023-12-28
2024	2024-01-14	2024-12-31
2025	2025-01-06	2025-11-30
2026	2026-01-14	2026-08-28

Every Fixed Threshold

Fixed thresholds at On
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	66	31	2023	11
25 mm (0.98 in): Days with 25 mm or more rain	57	6	1979	1
50 mm (1.97 in): Days with 50 mm or more rain	8	1	1963	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1961.

Download the Data

Data for On 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

On Threshold Days by Year (SWE00138938)

Key Facts for On Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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