Climate at a Glance

Statewide Rankings

Look up monthly rankings for 1-12, 18, 24, 36, 48, and 60-month time periods using the options below. Data and statistics are as of August 2021. For more information, please see Climatological Rankings.


Illinois

Average Temperature Rankings, September 1991

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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2020)
Warmest/Coolest
Since
Record
September 1991
1-Month
66.4°F
(19.1°C)
66.2°F
(19.0°C)
0.2°F
(0.1°C)
67th Coolest Coolest since: 1989 1918
60th Warmest Warmest since: 1990 1925, 1933
Aug–Sep 1991
2-Month
70.6°F
(21.4°C)
69.9°F
(21.1°C)
0.7°F
(0.3°C)
82nd Coolest Coolest since: 1990 1967
45th Warmest Warmest since: 1988 1936
Ties: 1911, 1926, 1944
Jul–Sep 1991
3-Month
72.5°F
(22.5°C)
71.8°F
(22.1°C)
0.7°F
(0.4°C)
85th Coolest Coolest since: 1990 1967
42nd Warmest Warmest since: 1988 1936
Ties: 1973
Jun–Sep 1991
4-Month
73.1°F
(22.8°C)
71.6°F
(22.0°C)
1.5°F
(0.8°C)
99th Coolest Coolest since: 1990 1915, 1924
28th Warmest Warmest since: 1988 1936
Ties: 1911, 1952, 1955, 1959
May–Sep 1991
5-Month
72.2°F
(22.3°C)
69.7°F
(20.9°C)
2.5°F
(1.4°C)
119th Coolest Coolest since: 1990 1924
8th Warmest Warmest since: 1988 1936
Ties: 1987, 2010, 2012
Apr–Sep 1991
6-Month
69.5°F
(20.8°C)
66.7°F
(19.3°C)
2.8°F
(1.5°C)
124th Coolest Coolest since: 1990 1907
3rd Warmest Warmest since: 1936 2010
Ties: 1921, 1934
Mar–Sep 1991
7-Month
65.9°F
(18.8°C)
62.9°F
(17.2°C)
3.0°F
(1.6°C)
122nd Coolest Coolest since: 1990 1924
5th Warmest Warmest since: 1936 2012
Feb–Sep 1991
8-Month
61.9°F
(16.6°C)
58.7°F
(14.8°C)
3.2°F
(1.8°C)
124th Coolest Coolest since: 1990 1904
3rd Warmest Warmest since: 1921 2012
Jan–Sep 1991
9-Month
57.6°F
(14.2°C)
54.9°F
(12.7°C)
2.7°F
(1.5°C)
120th Coolest Coolest since: 1990 1904, 1912
7th Warmest Warmest since: 1987 2012
Ties: 2005
Dec 1990–Sep 1991
10-Month
54.9°F
(12.7°C)
52.4°F
(11.3°C)
2.5°F
(1.4°C)
118th Coolest Coolest since: 1990 1904
8th Warmest Warmest since: 1987 2012
Ties: 2005
Nov 1990–Sep 1991
11-Month
54.2°F
(12.3°C)
51.4°F
(10.8°C)
2.8°F
(1.5°C)
120th Coolest Coolest since: 1990 1904
6th Warmest Warmest since: 1921 2012
Ties: 1998
Oct 1990–Sep 1991
12-Month
54.0°F
(12.2°C)
51.6°F
(10.9°C)
2.4°F
(1.3°C)
116th Coolest Coolest since: 1990 1904
10th Warmest Warmest since: 1954 2012
Ties: 2000
Apr 1990–Sep 1991
18-Month
58.0°F
(14.4°C)
56.6°F
(13.7°C)
1.4°F
(0.7°C)
105th Coolest Coolest since: 1990 1904, 1918
21st Warmest Warmest since: 1988 2012
Ties: 1914, 1935, 2011
Oct 1989–Sep 1991
24-Month
53.2°F
(11.8°C)
51.7°F
(10.9°C)
1.5°F
(0.9°C)
110th Coolest Coolest since: 1990 1979
15th Warmest Warmest since: 1988 2017
Ties: 1988, 2016
Oct 1988–Sep 1991
36-Month
52.4°F
(11.3°C)
51.6°F
(10.9°C)
0.8°F
(0.4°C)
92nd Coolest Coolest since: 1990 1979
32nd Warmest Warmest since: 1989 2018
Ties: 1943, 1957, 1993
Oct 1987–Sep 1991
48-Month
52.5°F
(11.4°C)
51.6°F
(10.9°C)
0.9°F
(0.5°C)
99th Coolest Coolest since: 1990 1905
24th Warmest Warmest since: 1988 2019
Ties: 2009
Oct 1986–Sep 1991
60-Month
52.8°F
(11.6°C)
51.6°F
(10.9°C)
1.2°F
(0.7°C)
110th Coolest Coolest since: 1990 1906
12th Warmest Warmest since: 1957 2020
Ties: 1957, 2009, 2016

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published September 2021, retrieved on September 23, 2021 from https://www.ncdc.noaa.gov/cag/