Statewide Rankings

Statewide Data Info
Please note, Degree Days and Palmer Indices are not available for Alaska. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Illinois

Average Temperature Rankings, September 2019

View Period (Months):
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  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
September 2019
1-Month
71.6°F
(22.0°C)
66.2°F
(19.0°C)
5.4°F
(3.0°C)
125th Coolest
Coolest since:
1918
4th Warmest
Warmest since:
1925, 1933
Aug–Sep 2019
2-Month
72.2°F
(22.3°C)
69.8°F
(21.0°C)
2.4°F
(1.3°C)
110th Coolest
Coolest since:
1967
19th Warmest
Warmest since:
1936
Ties: 1938, 1941, 1960, 2002
Jul–Sep 2019
3-Month
73.9°F
(23.3°C)
71.7°F
(22.1°C)
2.2°F
(1.2°C)
115th Coolest
Coolest since:
1967
14th Warmest
Warmest since:
1936
Ties: 1900, 2010
Jun–Sep 2019
4-Month
73.2°F
(22.9°C)
71.7°F
(22.1°C)
1.5°F
(0.8°C)
104th Coolest
Coolest since:
1915, 1924
25th Warmest
Warmest since:
1936
Ties: 1987, 1998, 2012
May–Sep 2019
5-Month
71.0°F
(21.7°C)
69.7°F
(20.9°C)
1.3°F
(0.8°C)
95th Coolest
Coolest since:
1924
34th Warmest
Warmest since:
1936
Ties: 2021, 2022
Apr–Sep 2019
6-Month
67.9°F
(19.9°C)
66.7°F
(19.3°C)
1.2°F
(0.6°C)
97th Coolest
Coolest since:
1907
32nd Warmest
Warmest since:
2010
Ties: 1944, 1980, 2015, 2021
Mar–Sep 2019
7-Month
63.6°F
(17.6°C)
62.9°F
(17.2°C)
0.7°F
(0.4°C)
87th Coolest
Coolest since:
1924
42nd Warmest
Warmest since:
2012
Ties: 1931
Feb–Sep 2019
8-Month
59.3°F
(15.2°C)
58.7°F
(14.8°C)
0.6°F
(0.4°C)
81st Coolest
Coolest since:
1904
48th Warmest
Warmest since:
2012
Ties: 1896, 1995, 2004, 2021
Jan–Sep 2019
9-Month
55.5°F
(13.1°C)
54.9°F
(12.7°C)
0.6°F
(0.4°C)
80th Coolest
Coolest since:
1904, 1912
49th Warmest
Warmest since:
2012
Ties: 1949, 1976, 1995
Dec 2018–Sep 2019
10-Month
53.4°F
(11.9°C)
52.4°F
(11.3°C)
1.0°F
(0.6°C)
89th Coolest
Coolest since:
1904
39th Warmest
Warmest since:
2012
Ties: 1896, 1944
Nov 2018–Sep 2019
11-Month
51.8°F
(11.0°C)
51.4°F
(10.8°C)
0.4°F
(0.2°C)
77th Coolest
Coolest since:
1904
51st Warmest
Warmest since:
2012
Ties: 1952, 1957
Oct 2018–Sep 2019
12-Month
52.0°F
(11.1°C)
51.6°F
(10.9°C)
0.4°F
(0.2°C)
75th Coolest
Coolest since:
1904
53rd Warmest
Warmest since:
2012
Ties: 1901, 1944, 1946, 1959, 1985, 1992, 2013
Apr 2018–Sep 2019
18-Month
57.5°F
(14.2°C)
56.7°F
(13.7°C)
0.8°F
(0.5°C)
94th Coolest
Coolest since:
1904, 1918
34th Warmest
Warmest since:
2012
Ties: 1937, 1983, 1995, 2021
Oct 2017–Sep 2019
24-Month
52.5°F
(11.4°C)
51.7°F
(10.9°C)
0.8°F
(0.5°C)
93rd Coolest
Coolest since:
1979
34th Warmest
Warmest since:
2017
Ties: 1921
Oct 2016–Sep 2019
36-Month
53.3°F
(11.8°C)
51.6°F
(10.9°C)
1.7°F
(0.9°C)
115th Coolest
Coolest since:
1979
11th Warmest
Warmest since:
2018
Ties: 2002
Oct 2015–Sep 2019
48-Month
53.8°F
(12.1°C)
51.6°F
(10.9°C)
2.2°F
(1.2°C)
124th Coolest
Coolest since:
1905
1st Warmest
Warmest to Date
2019
Oct 2014–Sep 2019
60-Month
53.3°F
(11.8°C)
51.6°F
(10.9°C)
1.7°F
(0.9°C)
121st Coolest
Coolest since:
1906
3rd Warmest
Warmest since:
2020

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