All-time weather records — Monmouth, IL

Record high
109.9°F
July 15, 1936
Record low
-49.0°F
May 30, 1915
Wettest day
6.53 in
July 15, 1929

Climate change signal in Monmouth

9.3%

of Monmouth's all-time daily heat records were set in the last decade (34 of 366 records since 2015).

5.2%

of all-time daily cold records were set in the last decade (19 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 #
1890s
29
52
1900s
30
53
1910s
52
44
1920s
23
32
1930s
61
20
1940s
17
17
1950s
27
22
1960s
14
28
1970s
12
25
1980s
22
23
1990s
16
16
2000s
18
9
2010s
27
21
2020s
18
4

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 1894, the latest in 2026. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 69.1°F — Jan 31, 1989 -25.1°F — Jan 5, 1999 2.30 in — Jan 24, 1938
February 79.0°F — Feb 28, 2024 -27.0°F — Feb 13, 1905 2.85 in — Feb 21, 1997
March 88.0°F — Mar 21, 1907 -14.1°F — Mar 3, 2014 2.65 in — Mar 19, 1948
April 93.0°F — Apr 10, 1930 10.0°F — Apr 2, 1899 4.16 in — Apr 18, 2013
May 102.0°F — May 31, 1934 -49.0°F — May 30, 1915 3.00 in — May 15, 2009
June 104.0°F — Jun 1, 1934 33.1°F — Jun 6, 1894 5.76 in — Jun 12, 1946
July 109.9°F — Jul 15, 1936 43.0°F — Jul 17, 1896 6.53 in — Jul 15, 1929
August 105.1°F — Aug 14, 1909 37.9°F — Aug 31, 1915 4.90 in — Aug 16, 1898
September 102.9°F — Sep 3, 1913 18.0°F — Sep 30, 1899 4.48 in — Sep 24, 1911
October 93.0°F — Oct 1, 1897 7.0°F — Oct 30, 1925 4.14 in — Oct 1, 1927
November 82.0°F — Nov 1, 1933 -4.0°F — Nov 26, 1898 2.46 in — Nov 27, 1990
December 73.0°F — Dec 16, 2021 -22.0°F — Dec 28, 1924 3.75 in — Dec 10, 2003

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