All-time weather records — Mystic, IA

Record high
106.0°F
July 24, 2012
Record low
-27.9°F
January 12, 1974
Wettest day
12.34 in
August 24, 2007

Climate change signal in Mystic

21.9%

of Mystic's all-time daily heat records were set in the last decade (80 of 366 records since 2015).

10.9%

of all-time daily cold records were set in the last decade (40 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 #
1970s
50
134
1980s
86
91
1990s
58
52
2000s
49
30
2010s
80
38
2020s
43
21

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 1970, the latest in 2026. Period of observation: 1970-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 66.9°F — Jan 9, 2003 -27.9°F — Jan 12, 1974 1.33 in — Jan 31, 2025
February 75.9°F — Feb 23, 2017 -26.0°F — Feb 3, 1996 2.07 in — Feb 21, 1997
March 91.0°F — Mar 22, 2026 -11.0°F — Mar 4, 1978 2.22 in — Mar 6, 2026
April 89.1°F — Apr 22, 1980 12.0°F — Apr 2, 2018 5.75 in — Apr 18, 2013
May 97.0°F — May 28, 2018 28.0°F — May 7, 1989 3.05 in — May 14, 1970
June 102.9°F — Jun 26, 1988 41.0°F — Jun 16, 1989 4.59 in — Jun 25, 2015
July 106.0°F — Jul 24, 2012 43.0°F — Jul 31, 1971 6.89 in — Jul 5, 2010
August 104.0°F — Aug 30, 1984 43.0°F — Aug 1, 1971 12.34 in — Aug 24, 2007
September 99.0°F — Sep 10, 2013 30.0°F — Sep 29, 1984 4.50 in — Sep 7, 2015
October 91.9°F — Oct 1, 2023 16.0°F — Oct 19, 1972 3.33 in — Oct 4, 2013
November 79.0°F — Nov 9, 1999 -8.0°F — Nov 8, 1991 2.50 in — Nov 2, 1971
December 73.9°F — Dec 16, 2021 -26.0°F — Dec 23, 1989 2.47 in — Dec 8, 1980

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