All-time weather records — Mazon, IL

Record high
109.0°F
July 14, 1936
Record low
-26.0°F
December 28, 1924
Wettest day
6.51 in
September 28, 2019

Climate change signal in Mazon

14.8%

of Mazon's all-time daily heat records were set in the last decade (54 of 366 records since 2015).

4.1%

of all-time daily cold records were set in the last decade (15 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 #
1910s
36
50
1920s
42
52
1930s
80
61
1940s
31
53
1950s
38
47
1960s
24
60
1970s
3
2
1990s
8
12
2000s
33
12
2010s
41
12
2020s
30
5

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 1912, the latest in 2026. Period of observation: 1911-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 68.0°F — Jan 25, 1950 -23.1°F — Jan 15, 1927 2.86 in — Jan 8, 2008
February 73.9°F — Feb 28, 2024 -22.0°F — Feb 3, 1996 3.20 in — Feb 21, 1997
March 84.9°F — Mar 22, 2012 -18.9°F — Mar 8, 1943 2.61 in — Mar 19, 1948
April 93.0°F — Apr 11, 1930 12.0°F — Apr 6, 1920 4.16 in — Apr 5, 1947
May 102.9°F — May 31, 1934 24.1°F — May 23, 1932 3.90 in — May 18, 1965
June 106.0°F — Jun 1, 1934 34.0°F — Jun 3, 1956 4.43 in — Jun 14, 2015
July 109.0°F — Jul 14, 1936 1.9°F — Jul 30, 2005 5.61 in — Jul 10, 2000
August 107.1°F — Aug 9, 1934 34.0°F — Aug 30, 1946 4.94 in — Aug 24, 2007
September 102.9°F — Sep 6, 1922 26.1°F — Sep 28, 1942 6.51 in — Sep 28, 2019
October 95.0°F — Oct 6, 1963 12.0°F — Oct 28, 1925 4.18 in — Oct 25, 2021
November 82.0°F — Nov 1, 1950 -9.0°F — Nov 25, 1950 2.20 in — Nov 22, 1931
December 72.0°F — Dec 4, 2012 -26.0°F — Dec 28, 1924 2.27 in — Dec 21, 1949

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