All-time weather records — South Lyon, MI

Record high
99.0°F
July 18, 2012
Record low
-26.0°F
February 20, 2015
Wettest day
4.00 in
July 6, 2024

Climate change signal in South Lyon

63.9%

of South Lyon's all-time daily heat records were set in the last decade (234 of 366 records since 2015).

44.3%

of all-time daily cold records were set in the last decade (162 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 #
2000s
27
77
2010s
223
220
2020s
116
69

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 2007, the latest in 2026. Period of observation: 2007-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 61.0°F — Jan 8, 2008 -18.9°F — Jan 24, 2026 1.63 in — Jan 11, 2020
February 71.1°F — Feb 28, 2024 -26.0°F — Feb 20, 2015 2.20 in — Feb 14, 2009
March 84.0°F — Mar 22, 2012 -16.1°F — Mar 1, 2014 1.52 in — Mar 2, 2018
April 86.0°F — Apr 25, 2025 15.1°F — Apr 5, 2016 2.08 in — Apr 28, 2011
May 93.0°F — May 29, 2018 26.1°F — May 9, 2020 3.13 in — May 13, 2014
June 96.1°F — Jun 29, 2012 37.9°F — Jun 3, 2013 3.20 in — Jun 20, 2009
July 99.0°F — Jul 18, 2012 46.0°F — Jul 1, 2008 4.00 in — Jul 6, 2024
August 93.0°F — Aug 4, 2012 43.0°F — Aug 30, 2025 3.56 in — Aug 12, 2021
September 93.0°F — Sep 1, 2012 33.1°F — Sep 19, 2020 3.74 in — Sep 14, 2008
October 88.0°F — Oct 7, 2007 23.0°F — Oct 30, 2008 1.51 in — Oct 5, 2013
November 78.1°F — Nov 2, 2016 5.0°F — Nov 13, 2019 1.33 in — Nov 30, 2011
December 60.1°F — Dec 4, 2012 -17.0°F — Dec 28, 2017 1.00 in — Dec 22, 2013

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