All-time weather records — Alto Pass, IL

Record high
111.9°F
July 22, 1901
Record low
-20.0°F
January 12, 1918
Wettest day
7.74 in
March 18, 2008

Climate change signal in Alto Pass

1.1%

of Alto Pass's all-time daily heat records were set in the last decade (4 of 366 records since 2015).

1.1%

of all-time daily cold records were set in the last decade (4 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
26
28
1900s
61
32
1910s
81
31
1920s
40
32
1930s
48
17
1940s
10
32
1950s
20
31
1960s
16
34
1970s
6
20
1980s
16
28
1990s
10
41
2000s
10
35
2010s
18
1
2020s
4
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 1896, the latest in 2026. Period of observation: 1895-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 75.9°F — Jan 23, 1909 -20.0°F — Jan 12, 1918 6.70 in — Jan 22, 1999
February 78.1°F — Feb 10, 1932 -18.9°F — Feb 9, 1899 4.04 in — Feb 26, 1945
March 91.0°F — Mar 23, 1910 0.0°F — Mar 5, 1960 7.74 in — Mar 18, 2008
April 91.9°F — Apr 28, 1915 19.9°F — Apr 8, 2007 4.75 in — Apr 29, 2017
May 98.1°F — May 26, 1911 30.9°F — May 1, 1903 4.76 in — May 31, 1997
June 105.1°F — Jun 20, 1936 39.0°F — Jun 4, 1998 4.86 in — Jun 28, 1983
July 111.9°F — Jul 22, 1901 46.0°F — Jul 23, 1947 6.15 in — Jul 27, 1909
August 109.9°F — Aug 9, 1930 45.0°F — Aug 30, 1946 4.45 in — Aug 17, 1959
September 107.1°F — Sep 6, 1925 32.0°F — Sep 23, 1995 4.45 in — Sep 23, 1993
October 95.0°F — Oct 1, 1910 19.9°F — Oct 24, 1981 5.10 in — Oct 4, 1910
November 82.9°F — Nov 4, 1987 -5.1°F — Nov 25, 1950 6.24 in — Nov 15, 2005
December 75.9°F — Dec 2, 1982 -14.1°F — Dec 22, 1989 5.15 in — Dec 13, 1918

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