All-time weather records — Keystone, IA

Record high
111.0°F
August 18, 1936
Record low
-38.0°F
January 16, 2009
Wettest day
6.46 in
August 2, 1929

Climate change signal in Keystone

6%

of Keystone's all-time daily heat records were set in the last decade (22 of 366 records since 2015).

5.2%

of all-time daily cold records were set in the last decade (19 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
15
45
1900s
13
33
1910s
20
56
1920s
44
38
1930s
96
35
1940s
21
18
1950s
30
18
1960s
15
16
1970s
7
22
1980s
33
22
1990s
14
14
2000s
18
16
2010s
30
25
2020s
10
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 1893, the latest in 2026. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 79.0°F — Jan 23, 1908 -38.0°F — Jan 16, 2009 3.25 in — Jan 12, 1960
February 75.9°F — Feb 27, 2024 -35.0°F — Feb 3, 1996 2.50 in — Feb 9, 1904
March 89.1°F — Mar 22, 2026 -23.1°F — Mar 1, 1962 2.18 in — Mar 19, 1922
April 95.0°F — Apr 25, 1986 7.0°F — Apr 20, 1904 2.75 in — Apr 24, 1965
May 108.0°F — May 31, 1934 21.9°F — May 3, 2005 3.63 in — May 6, 1960
June 106.0°F — Jun 28, 1934 35.1°F — Jun 4, 1897 5.26 in — Jun 23, 2007
July 109.0°F — Jul 26, 1936 42.1°F — Jul 3, 1908 6.38 in — Jul 14, 1962
August 111.0°F — Aug 18, 1936 36.0°F — Aug 20, 1950 6.46 in — Aug 2, 1929
September 104.0°F — Sep 4, 1925 12.0°F — Sep 10, 1905 5.26 in — Sep 16, 1921
October 93.0°F — Oct 2, 1953 -2.0°F — Oct 30, 1925 3.74 in — Oct 2, 2019
November 82.0°F — Nov 1, 1924 -9.9°F — Nov 26, 1898 3.55 in — Nov 4, 2003
December 70.0°F — Dec 4, 2012 -29.9°F — Dec 19, 1985 2.00 in — Dec 20, 1895

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