All-time weather records — Iron Mountain, MI

Record high
99.0°F
July 31, 2006
Record low
-27.9°F
December 25, 2004
Wettest day
3.31 in
September 23, 2010

Climate change signal in Iron Mountain

42.3%

of Iron Mountain's all-time daily heat records were set in the last decade (155 of 366 records since 2015).

25.1%

of all-time daily cold records were set in the last decade (92 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 #
1990s
33
61
2000s
123
144
2010s
111
118
2020s
99
43

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 1997, the latest in 2026. Period of observation: 1996-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 52.0°F — Jan 25, 2012 -26.9°F — Jan 9, 2014 0.73 in — Jan 2, 2000
February 64.9°F — Feb 27, 2024 -26.9°F — Feb 15, 2021 1.02 in — Feb 11, 1999
March 82.0°F — Mar 21, 2012 -24.0°F — Mar 3, 2003 0.97 in — Mar 16, 2016
April 86.0°F — Apr 13, 2023 -5.1°F — Apr 6, 2003 2.19 in — Apr 12, 2026
May 93.0°F — May 24, 2010 18.0°F — May 3, 2004 2.05 in — May 23, 2004
June 98.1°F — Jun 20, 2022 27.0°F — Jun 5, 1998 2.29 in — Jun 25, 2024
July 99.0°F — Jul 31, 2006 36.0°F — Jul 1, 2007 2.93 in — Jul 14, 1999
August 97.0°F — Aug 8, 2001 33.1°F — Aug 31, 2009 2.60 in — Aug 14, 2018
September 97.0°F — Sep 11, 1998 10.0°F — Sep 4, 2005 3.31 in — Sep 23, 2010
October 86.0°F — Oct 2, 2023 13.1°F — Oct 27, 2020 2.51 in — Oct 5, 2005
November 77.0°F — Nov 6, 2020 -7.8°F — Nov 27, 2014 0.97 in — Nov 23, 1999
December 62.1°F — Dec 3, 1998 -27.9°F — Dec 25, 2004 0.82 in — Dec 14, 2015

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