All-time weather records — Iowa City, IA

Record high
105.1°F
July 7, 2012
Record low
-34.1°F
February 3, 1996
Wettest day
5.65 in
June 22, 2007

Climate change signal in Iowa City

34.2%

of Iowa City's all-time daily heat records were set in the last decade (125 of 366 records since 2015).

14.5%

of all-time daily cold records were set in the last decade (53 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 #
1940s
15
25
1950s
31
107
1990s
34
61
2000s
104
86
2010s
102
58
2020s
80
29

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 1948, the latest in 2026. Period of observation: 1948-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 64.9°F — Jan 8, 2003 -27.9°F — Jan 31, 1996 1.42 in — Jan 25, 1950
February 77.0°F — Feb 22, 2017 -34.1°F — Feb 3, 1996 1.66 in — Feb 27, 1948
March 91.0°F — Mar 21, 2026 -16.1°F — Mar 12, 1948 1.68 in — Mar 8, 2009
April 91.9°F — Apr 29, 1952 15.3°F — Apr 2, 2018 3.98 in — Apr 17, 2013
May 98.1°F — May 27, 2018 24.1°F — May 3, 2005 4.67 in — May 9, 1996
June 99.0°F — Jun 27, 2012 41.0°F — Jun 4, 1950 5.65 in — Jun 22, 2007
July 105.1°F — Jul 7, 2012 46.0°F — Jul 5, 1997 3.02 in — Jul 3, 2004
August 100.9°F — Aug 20, 2003 39.9°F — Aug 20, 1950 3.34 in — Aug 23, 2002
September 100.9°F — Sep 9, 2013 26.1°F — Sep 23, 1995 2.76 in — Sep 5, 2018
October 93.0°F — Oct 3, 2006 10.9°F — Oct 29, 1952 3.56 in — Oct 17, 1998
November 79.0°F — Nov 1, 2000 -2.9°F — Nov 24, 1950 2.62 in — Nov 16, 1952
December 75.0°F — Dec 15, 2021 -18.9°F — Dec 15, 1951 1.59 in — Dec 13, 2015

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