Ionia Weather Records (USC00204075)

Record envelope, standing records and threshold days for Ionia (USC00204075), Michigan, United States, with 67 years of record.

Key Facts for Ionia

Ionia (USC00204075) is a weather station in Michigan, United States at 43.00 latitude and -85.08 longitude, 244 m (801 ft) above sea level.
The station reports from 1905 to 1971, 67 years of record.
500 records set at Ionia still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Michigan, United States, 43.00 latitude, -85.08 longitude.
Elevation: 244 m (801 ft).
Period of record: 1905 to 1971, 67 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Ionia. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Ionia, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	-21.7 C (-7.1 F)	n/a	n/a
Feb	15.0 C (59.0 F)	-26.7 C (-16.1 F)	n/a	n/a
Mar	27.2 C (81.0 F)	-25.6 C (-14.1 F)	n/a	n/a
Apr	28.9 C (84.0 F)	-13.3 C (8.1 F)	n/a	n/a
May	32.2 C (90.0 F)	-5.6 C (21.9 F)	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

500 standing records

500 records at Ionia still stand. 1945 holds the most, with 59.

Wettest Day of Each Month

May: 79.8 mm (3.1 in)

The wettest day on record for each calendar month at Ionia. The most was 79.8 mm (3.1 in) on 1 May 1962.

Record daily precipitation for each month at Ionia
Month	Record daily precipitation (mm)	Date
Jan	28.4 mm (1.1 in)	8 January 1907
Feb	69.6 mm (2.7 in)	13 February 1938
Mar	55.9 mm (2.2 in)	19 March 1948
Apr	54.4 mm (2.1 in)	29 April 1909
May	79.8 mm (3.1 in)	1 May 1962
Jun	1.5 mm (0.06 in)	10 June 1906

Period of Record Coverage

1945 to 1968

13 years of record at Ionia, 1945 to 1968. 13 years have data for under 90 percent of days and are left out of rankings: 1945, 1947, 1948, 1949, 1954, 1961, 1962, 1963 and others.

Days with data per year at Ionia
Year	Days with data	Share of year	Complete
1945	118	32%	No
1947	87	24%	No
1948	119	33%	No
1949	115	32%	No
1954	23	6%	No
1961	120	33%	No
1962	120	33%	No
1963	120	33%	No
1964	121	33%	No
1965	119	33%	No
1966	120	33%	No
1967	120	33%	No
1968	121	33%	No

Latest Records

No records were set at this station in the latest data.

Extremes by Year

1905 to 1971

Yearly extremes at Ionia: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	32.2 C (90.0 F)	1949	28.9 C (84.0 F)	13
Coldest night (TNn)	-26.7 C (-16.1 F)	1963	-21.9 C (-7.5 F)	14
Wettest day (Rx1day)	79.8 mm (3.1 in)	1962	31.5 mm (1.2 in)	59
Wettest five days (Rx5day)	142.8 mm (5.6 in)	1962	48.8 mm (1.9 in)	57
Longest dry spell (CDD)	27 days	1915	12 days	59

Hottest day (TXx)

The hottest day of the year at Ionia, 1905 to 1971. The record is 32.2 C (90.0 F) in 1949, marked on the chart; the median year is 28.9 C (84.0 F).

Hottest day (TXx) at Ionia by year
Year	Hottest day (TXx)
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1945	28.9 C (84.0 F)
1947	27.2 C (81.0 F)
1948	30.0 C (86.0 F)
1949	32.2 C (90.0 F)
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	15.0 C (59.0 F)
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	28.9 C (84.0 F)
1962	32.2 C (90.0 F)
1963	27.2 C (81.0 F)
1964	32.2 C (90.0 F)
1965	31.7 C (89.1 F)
1966	28.9 C (84.0 F)
1967	27.2 C (81.0 F)
1968	29.4 C (84.9 F)
1969	n/a
1970	n/a
1971	n/a

Coldest night (TNn)

The coldest night of the year at Ionia, 1905 to 1971. The record is -26.7 C (-16.1 F) in 1963, marked on the chart; the median year is -21.9 C (-7.5 F).

Coldest night (TNn) at Ionia by year
Year	Coldest night (TNn)
1905	-21.7 C (-7.1 F)
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1945	-22.2 C (-8.0 F)
1947	-10.6 C (12.9 F)
1948	-24.4 C (-11.9 F)
1949	-17.8 C (0.0 F)
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	-18.3 C (-0.9 F)
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	-22.8 C (-9.0 F)
1962	-25.6 C (-14.1 F)
1963	-26.7 C (-16.1 F)
1964	-16.7 C (1.9 F)
1965	-17.8 C (0.0 F)
1966	-25.0 C (-13.0 F)
1967	-26.1 C (-15.0 F)
1968	-20.0 C (-4.0 F)
1969	n/a
1970	n/a
1971	n/a

Wettest day (Rx1day)

The wettest day of the year at Ionia, 1905 to 1971. The record is 79.8 mm (3.1 in) in 1962, marked on the chart; the median year is 31.5 mm (1.2 in).

Wettest day (Rx1day) at Ionia by year
Year	Wettest day (Rx1day)
1905	36.1 mm (1.4 in)
1906	27.4 mm (1.1 in)
1907	30.0 mm (1.2 in)
1908	39.1 mm (1.5 in)
1909	54.4 mm (2.1 in)
1910	29.5 mm (1.2 in)
1911	21.3 mm (0.8 in)
1912	11.7 mm (0.5 in)
1913	20.1 mm (0.8 in)
1914	33.0 mm (1.3 in)
1915	22.1 mm (0.9 in)
1916	27.4 mm (1.1 in)
1917	36.8 mm (1.4 in)
1918	19.1 mm (0.8 in)
1919	34.0 mm (1.3 in)
1920	38.9 mm (1.5 in)
1921	19.3 mm (0.8 in)
1922	40.6 mm (1.6 in)
1923	41.4 mm (1.6 in)
1924	26.7 mm (1.1 in)
1925	16.3 mm (0.6 in)
1926	26.7 mm (1.1 in)
1927	32.8 mm (1.3 in)
1928	36.1 mm (1.4 in)
1929	53.3 mm (2.1 in)
1930	25.7 mm (1.0 in)
1931	25.4 mm (1.0 in)
1932	28.4 mm (1.1 in)
1933	41.1 mm (1.6 in)
1936	17.8 mm (0.7 in)
1937	27.2 mm (1.1 in)
1938	69.6 mm (2.7 in)
1939	32.5 mm (1.3 in)
1945	41.4 mm (1.6 in)
1947	47.8 mm (1.9 in)
1948	55.9 mm (2.2 in)
1949	29.0 mm (1.1 in)
1950	31.0 mm (1.2 in)
1951	41.4 mm (1.6 in)
1952	36.3 mm (1.4 in)
1953	16.0 mm (0.6 in)
1954	42.9 mm (1.7 in)
1955	30.5 mm (1.2 in)
1956	50.0 mm (2.0 in)
1957	36.3 mm (1.4 in)
1958	22.9 mm (0.9 in)
1959	31.8 mm (1.3 in)
1960	25.9 mm (1.0 in)
1961	23.4 mm (0.9 in)
1962	79.8 mm (3.1 in)
1963	32.5 mm (1.3 in)
1964	30.5 mm (1.2 in)
1965	36.6 mm (1.4 in)
1966	27.4 mm (1.1 in)
1967	42.4 mm (1.7 in)
1968	27.9 mm (1.1 in)
1969	38.1 mm (1.5 in)
1970	31.5 mm (1.2 in)
1971	27.9 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ionia, 1905 to 1971. The record is 142.8 mm (5.6 in) in 1962, marked on the chart; the median year is 48.8 mm (1.9 in).

Wettest five days (Rx5day) at Ionia by year
Year	Wettest five days (Rx5day)
1905	48.8 mm (1.9 in)
1906	29.9 mm (1.2 in)
1907	58.4 mm (2.3 in)
1908	46.8 mm (1.8 in)
1909	91.5 mm (3.6 in)
1910	42.5 mm (1.7 in)
1911	34.0 mm (1.3 in)
1912	17.3 mm (0.7 in)
1913	52.2 mm (2.1 in)
1914	45.5 mm (1.8 in)
1915	36.4 mm (1.4 in)
1916	41.8 mm (1.6 in)
1917	68.0 mm (2.7 in)
1918	42.4 mm (1.7 in)
1919	66.7 mm (2.6 in)
1920	46.8 mm (1.8 in)
1921	52.6 mm (2.1 in)
1922	84.8 mm (3.3 in)
1923	80.0 mm (3.1 in)
1924	37.1 mm (1.5 in)
1925	27.4 mm (1.1 in)
1926	43.0 mm (1.7 in)
1927	52.2 mm (2.1 in)
1928	46.3 mm (1.8 in)
1929	75.8 mm (3.0 in)
1930	46.6 mm (1.8 in)
1931	27.9 mm (1.1 in)
1932	66.8 mm (2.6 in)
1933	61.6 mm (2.4 in)
1936	32.7 mm (1.3 in)
1937	54.6 mm (2.1 in)
1938	77.2 mm (3.0 in)
1939	57.4 mm (2.3 in)
1945	67.5 mm (2.7 in)
1947	69.1 mm (2.7 in)
1948	72.4 mm (2.9 in)
1949	45.5 mm (1.8 in)
1950	58.2 mm (2.3 in)
1951	33.5 mm (1.3 in)
1952	47.1 mm (1.9 in)
1953	41.2 mm (1.6 in)
1954	47.3 mm (1.9 in)
1955	52.6 mm (2.1 in)
1956	87.9 mm (3.5 in)
1957	61.8 mm (2.4 in)
1958	42.7 mm (1.7 in)
1959	62.5 mm (2.5 in)
1960	58.5 mm (2.3 in)
1961	50.3 mm (2.0 in)
1962	142.8 mm (5.6 in)
1963	19.1 mm (0.8 in)
1964	n/a
1965	43.3 mm (1.7 in)
1966	14.7 mm (0.6 in)
1967	n/a
1968	60.7 mm (2.4 in)
1969	0.0 mm (0.00 in)
1970	49.8 mm (2.0 in)
1971	2.0 mm (0.08 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ionia, 1905 to 1971. The record is 27 days in 1915, marked on the chart; the median year is 12 days.

Longest dry spell (CDD) at Ionia by year
Year	Longest dry spell (CDD)
1905	10 days
1906	12 days
1907	13 days
1908	8 days
1909	8 days
1910	17 days
1911	9 days
1912	9 days
1913	15 days
1914	17 days
1915	27 days
1916	8 days
1917	17 days
1918	16 days
1919	10 days
1920	19 days
1921	23 days
1922	17 days
1923	16 days
1924	13 days
1925	14 days
1926	16 days
1927	11 days
1928	15 days
1929	11 days
1930	10 days
1931	11 days
1932	17 days
1933	11 days
1936	13 days
1937	14 days
1938	14 days
1939	16 days
1945	9 days
1947	13 days
1948	12 days
1949	15 days
1950	10 days
1951	11 days
1952	14 days
1953	8 days
1954	18 days
1955	8 days
1956	8 days
1957	12 days
1958	16 days
1959	9 days
1960	10 days
1961	13 days
1962	2 days
1963	3 days
1964	1 day
1965	3 days
1966	2 days
1967	3 days
1968	4 days
1969	18 days
1970	16 days
1971	3 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

Data for Ionia standing records by year: CSV or JSON. Field meanings are on the data page.
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).