All-time weather records — Onawa, IA

Record high
109.9°F
July 4, 1936
Record low
-32.1°F
January 12, 1912
Wettest day
9.12 in
July 17, 1996

Climate change signal in Onawa

0%

of Onawa's all-time daily heat records were set in the last decade (0 of 366 records since 2015).

0%

of all-time daily cold records were set in the last decade (0 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1890s
2
2
1900s
16
26
1910s
22
34
1920s
9
40
1930s
100
33
1940s
28
47
1950s
47
39
1960s
25
34
1970s
22
21
1980s
29
28
1990s
21
25
2000s
42
29
2010s
3
8

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1899, the latest in 2011. Period of observation: 1899-2011.

Records by month

Month Hottest day Coldest day Wettest day
January 69.1°F — Jan 25, 1944 -32.1°F — Jan 12, 1912 1.42 in — Jan 4, 1949
February 71.1°F — Feb 7, 1987 -29.9°F — Feb 2, 1905 1.98 in — Feb 28, 1951
March 91.0°F — Mar 29, 1986 -23.1°F — Mar 5, 1960 2.89 in — Mar 23, 1987
April 97.0°F — Apr 28, 1910 3.9°F — Apr 3, 1975 3.20 in — Apr 22, 1999
May 106.0°F — May 30, 1934 17.1°F — May 3, 2005 4.20 in — May 5, 2007
June 106.0°F — Jun 16, 1946 36.0°F — Jun 7, 1935 4.85 in — Jun 7, 1934
July 109.9°F — Jul 4, 1936 37.9°F — Jul 19, 1921 9.12 in — Jul 17, 1996
August 108.0°F — Aug 8, 1934 24.1°F — Aug 29, 1936 5.00 in — Aug 26, 1903
September 104.0°F — Sep 6, 1939 23.0°F — Sep 28, 1942 6.98 in — Sep 26, 1915
October 97.0°F — Oct 3, 1938 -0.9°F — Oct 28, 1925 3.27 in — Oct 30, 1979
November 82.0°F — Nov 3, 2005 -15.0°F — Nov 21, 1937 2.30 in — Nov 5, 1905
December 70.0°F — Dec 1, 1998 -27.0°F — Dec 22, 1989 1.52 in — Dec 10, 1911

Click a month to see every daily record for that month in Onawa.