Ionia Threshold Days by Year (USC00143997)

18 fixed thresholds counted per year at Ionia (USC00143997): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ionia Thresholds

Ionia: days with 10 mm (0.39 in) or more of precipitation in 74 years, most in 1993 with 34.
Ionia: days with 25 mm (0.98 in) or more of precipitation in 71 years, most in 1993 with 14.
Ionia: days with 50 mm (1.97 in) or more of precipitation in 49 years, most in 1895 with 5.
Ionia: days with 10 cm (3.9 in) or more of snowfall in 45 years, most in 2013 with 5.
18 fixed thresholds have at least one qualifying day at Ionia.

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

74 years with a qualifying day

Days per year at Ionia with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 34 in 1993.

Days with 10 mm (0.39 in) or more of precipitation per year at Ionia
Year	Days	Decade average
1894	13	16
1895	19	16
1949	20	20
1950	26	21.4
1956	8	21.4
1957	28	21.4
1958	22	21.4
1959	23	21.4
1960	22	22.1
1961	27	22.1
1962	29	22.1
1963	23	22.1
1964	16	22.1
1965	19	22.1
1966	14	22.1
1967	24	22.1
1968	26	22.1
1969	21	22.1
1970	18	20.3
1971	17	20.3
1972	25	20.3
1973	26	20.3
1974	10	20.3
1975	23	20.3
1976	10	20.3
1977	27	20.3
1978	23	20.3
1979	24	20.3
1980	15	21
1981	28	21
1982	22	21
1983	21	21
1984	23	21
1985	23	21
1986	26	21
1987	20	21
1988	12	21
1989	20	21
1990	19	21.7
1991	18	21.7
1992	30	21.7
1993	34	21.7
1994	19	21.7
1995	19	21.7
1996	17	21.7
1997	17	21.7
1998	22	21.7
1999	22	21.7
2000	11	20
2001	21	20
2002	13	20
2003	18	20
2004	23	20
2005	23	20
2006	22	20
2007	22	20
2008	30	20
2009	17	20
2010	24	24.1
2011	24	24.1
2012	20	24.1
2013	18	24.1
2014	22	24.1
2015	27	24.1
2016	27	24.1
2017	24	24.1
2018	26	24.1
2019	29	24.1
2020	16	16.3
2021	21	16.3
2022	14	16.3
2023	19	16.3
2024	24	16.3
2025	4	16.3

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

First to last qualifying date each year at Ionia
Year	First date	Last date
1894	1894-04-14	1894-10-01
1895	1895-01-25	1895-11-13
1949	1949-01-23	1949-10-09
1950	1950-02-27	1950-10-01
1956	1956-02-01	1956-10-30
1957	1957-03-18	1957-11-18
1958	1958-02-27	1958-11-18
1959	1959-03-26	1959-12-27
1960	1960-01-15	1960-11-28
1961	1961-03-06	1961-12-11
1962	1962-01-26	1962-11-16
1963	1963-03-11	1963-10-27
1964	1964-03-20	1964-11-15
1965	1965-01-23	1965-10-19
1966	1966-02-09	1966-12-27
1967	1967-04-01	1967-12-17
1968	1968-04-03	1968-12-22
1969	1969-02-14	1969-10-30
1970	1970-04-13	1970-10-09
1971	1971-01-03	1971-12-30
1972	1972-03-24	1972-11-13
1973	1973-03-04	1973-12-24
1974	1974-04-11	1974-11-03
1975	1975-02-04	1975-11-20
1976	1976-02-21	1976-10-07
1977	1977-03-11	1977-10-31
1978	1978-02-13	1978-11-26
1979	1979-03-03	1979-11-20
1980	1980-01-16	1980-10-27
1981	1981-03-04	1981-12-01
1982	1982-03-19	1982-12-28
1983	1983-01-31	1983-11-27
1984	1984-02-18	1984-12-16
1985	1985-01-10	1985-10-18
1986	1986-02-04	1986-12-07
1987	1987-03-17	1987-10-26
1988	1988-01-19	1988-09-19
1989	1989-05-18	1989-10-27
1990	1990-01-20	1990-09-18
1991	1991-03-17	1991-12-23
1992	1992-01-01	1992-12-09
1993	1993-01-09	1993-12-14
1994	1994-01-27	1994-12-07
1995	1995-01-27	1995-09-21
1996	1996-04-14	1996-11-17
1997	1997-04-10	1997-12-24
1998	1998-02-01	1998-11-02
1999	1999-01-31	1999-12-03
2000	2000-03-03	2000-11-12
2001	2001-01-29	2001-11-24
2002	2002-01-31	2002-10-30
2003	2003-03-18	2003-11-02
2004	2004-01-26	2004-11-11
2005	2005-01-05	2005-11-28
2006	2006-03-19	2006-12-31
2007	2007-01-21	2007-12-15
2008	2008-03-17	2008-11-11
2009	2009-04-18	2009-12-23
2010	2010-03-06	2010-11-12
2011	2011-01-10	2011-12-14
2012	2012-02-03	2012-12-15
2013	2013-02-21	2013-11-06
2014	2014-04-21	2014-12-15
2015	2015-01-31	2015-12-14
2016	2016-01-08	2016-09-25
2017	2017-01-16	2017-10-07
2018	2018-03-19	2018-12-27
2019	2019-01-12	2019-12-29
2020	2020-01-22	2020-11-25
2021	2021-01-26	2021-10-28
2022	2022-03-18	2022-09-22
2023	2023-01-19	2023-12-16
2024	2024-01-09	2024-11-19
2025	2025-01-05	2025-04-25

Every Fixed Threshold

Fixed thresholds at Ionia
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	2	90	1894	60
35 C (95 F): Days	2	29	1894	21
40 C (104 F): Days	1	2	1894	2
90 F (32.2 C): Days	2	59	1894	38
100 F (37.8 C): Days	2	6	1894	6
0 C (32 F): Ice days (max	2	37	1895	37
0 C (32 F): Frost days (min	2	147	1895	147
-10 C (14 F): Days with min	2	62	1894	57
-20 C (-4 F): Days with min	2	16	1895	16
-30 C (-22 F): Days with min	1	1	1894	1
20 C (68 F): Tropical nights (min	2	29	1895	29
25 C (77 F): Days with min	2	4	1894	2
10 mm (0.39 in): Days with 10 mm or more rain	74	34	1993	4
25 mm (0.98 in): Days with 25 mm or more rain	71	14	1993	7
50 mm (1.97 in): Days with 50 mm or more rain	49	5	1895	2
100 mm (3.94 in): Days with 100 mm or more rain	3	2	1961	1
10 cm (3.9 in): Days with 10 cm or more snowfall	45	5	2013	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1968	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Ionia 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).

Ionia Threshold Days by Year (USC00143997)

Key Facts for Ionia Thresholds

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

Every Fixed Threshold

Download the Data

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