All-time weather records — Allerton, IA

Record high
108.0°F
July 5, 1911
Record low
-33.0°F
February 13, 1905
Wettest day
9.25 in
August 27, 1903

Climate change signal in Allerton

23.8%

of Allerton's all-time daily heat records were set in the last decade (87 of 366 records since 2015).

18.9%

of all-time daily cold records were set in the last decade (69 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 #
1900s
43
101
1910s
131
92
1940s
·
·
1950s
·
·
1970s
2
·
1980s
·
1
1990s
17
24
2000s
42
54
2010s
77
58
2020s
54
36

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 1902, the latest in 2026. Period of observation: 1902-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 66.9°F — Jan 9, 2003 -29.0°F — Jan 12, 1912 4.00 in — Jan 21, 2006
February 75.9°F — Feb 23, 2017 -33.0°F — Feb 13, 1905 4.00 in — Feb 13, 2007
March 91.0°F — Mar 22, 2026 -13.0°F — Mar 2, 1913 2.25 in — Mar 25, 1915
April 90.0°F — Apr 29, 1910 8.1°F — Apr 9, 2006 4.62 in — Apr 18, 2013
May 95.0°F — May 28, 2018 19.0°F — May 4, 1907 4.07 in — May 28, 1918
June 100.0°F — Jun 29, 1911 30.0°F — Jun 12, 1903 4.50 in — Jun 8, 1909
July 108.0°F — Jul 5, 1911 46.0°F — Jul 17, 1911 6.50 in — Jul 6, 1909
August 108.0°F — Aug 4, 1918 39.0°F — Aug 30, 1915 9.25 in — Aug 27, 1903
September 102.9°F — Sep 4, 1913 27.0°F — Sep 22, 1913 3.23 in — Sep 27, 2014
October 91.9°F — Oct 6, 2024 16.0°F — Oct 29, 1910 2.85 in — Oct 13, 1997
November 80.1°F — Nov 5, 1909 -4.0°F — Nov 30, 1919 2.98 in — Nov 11, 2021
December 73.0°F — Dec 16, 2021 -18.0°F — Dec 29, 1917 3.00 in — Dec 7, 2007

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