All-time weather records — Armstrong, IA

Record high
105.1°F
June 8, 1985
Record low
-32.1°F
January 21, 1970
Wettest day
6.82 in
September 15, 2004

Climate change signal in Armstrong

13.1%

of Armstrong's all-time daily heat records were set in the last decade (48 of 366 records since 2015).

15.8%

of all-time daily cold records were set in the last decade (58 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 #
1950s
38
34
1960s
49
76
1970s
44
91
1980s
52
29
1990s
47
28
2000s
65
34
2010s
34
47
2020s
37
27

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 1955, the latest in 2026. Period of observation: 1954-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 57.9°F — Jan 8, 2003 -32.1°F — Jan 21, 1970 1.25 in — Jan 21, 1975
February 69.1°F — Feb 27, 2024 -27.9°F — Feb 2, 1996 1.70 in — Feb 19, 1971
March 86.0°F — Mar 29, 2025 -20.0°F — Mar 1, 1962 2.10 in — Mar 22, 2005
April 93.0°F — Apr 21, 1980 0.0°F — Apr 3, 1975 2.32 in — Apr 23, 1955
May 104.0°F — May 15, 2013 10.0°F — May 3, 1967 3.85 in — May 20, 1960
June 105.1°F — Jun 8, 1985 35.1°F — Jun 3, 1969 4.00 in — Jun 4, 1991
July 104.0°F — Jul 31, 1955 37.0°F — Jul 11, 1998 3.11 in — Jul 25, 2014
August 100.9°F — Aug 15, 1988 37.9°F — Aug 21, 2004 4.50 in — Aug 30, 1993
September 98.1°F — Sep 19, 1984 21.9°F — Sep 28, 1967 6.82 in — Sep 15, 2004
October 93.9°F — Oct 5, 1963 6.1°F — Oct 28, 2020 3.61 in — Oct 1, 2007
November 81.0°F — Nov 9, 2006 -16.1°F — Nov 28, 2014 2.00 in — Nov 15, 1973
December 69.1°F — Dec 2, 1998 -27.9°F — Dec 18, 2016 1.18 in — Dec 28, 1982

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