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 2016

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
September 2016
1-Month		70.8°F
(21.6°C)		66.2°F
(19.0°C)		4.6°F
(2.6°C)		121st Coolest
Coolest since:
1918
8th Warmest
Warmest since:
1925, 1933
Aug–Sep 2016
2-Month		73.3°F
(22.9°C)		69.8°F
(21.0°C)		3.5°F
(1.9°C)		124th Coolest
Coolest since:
1967
5th Warmest
Warmest since:
1936
Jul–Sep 2016
3-Month		74.0°F
(23.3°C)		71.7°F
(22.1°C)		2.3°F
(1.2°C)		117th Coolest
Coolest since:
1967
12th Warmest
Warmest since:
1936
Ties: 1933
Jun–Sep 2016
4-Month		74.2°F
(23.4°C)		71.7°F
(22.1°C)		2.5°F
(1.3°C)		120th Coolest
Coolest since:
1915, 1924
9th Warmest
Warmest since:
1936
Ties: 1988
May–Sep 2016
5-Month		71.8°F
(22.1°C)		69.7°F
(20.9°C)		2.1°F
(1.2°C)		115th Coolest
Coolest since:
1924
14th Warmest
Warmest since:
1936
Ties: 1941, 1959
Apr–Sep 2016
6-Month		68.7°F
(20.4°C)		66.7°F
(19.3°C)		2.0°F
(1.1°C)		113th Coolest
Coolest since:
1907
16th Warmest
Warmest since:
2010
Mar–Sep 2016
7-Month		65.6°F
(18.7°C)		62.9°F
(17.2°C)		2.7°F
(1.5°C)		121st Coolest
Coolest since:
1924
8th Warmest
Warmest since:
2012
Feb–Sep 2016
8-Month		61.6°F
(16.4°C)		58.7°F
(14.8°C)		2.9°F
(1.6°C)		123rd Coolest
Coolest since:
1904
6th Warmest
Warmest since:
2012
Jan–Sep 2016
9-Month		57.8°F
(14.3°C)		54.9°F
(12.7°C)		2.9°F
(1.6°C)		123rd Coolest
Coolest since:
1904, 1912
6th Warmest
Warmest since:
2012
Dec 2015–Sep 2016
10-Month		56.1°F
(13.4°C)		52.4°F
(11.3°C)		3.7°F
(2.1°C)		125th Coolest
Coolest since:
1904
3rd Warmest
Warmest since:
2012
Nov 2015–Sep 2016
11-Month		55.2°F
(12.9°C)		51.4°F
(10.8°C)		3.8°F
(2.1°C)		126th Coolest
Coolest since:
1904
2nd Warmest
Warmest since:
2012
Oct 2015–Sep 2016
12-Month		55.3°F
(12.9°C)		51.6°F
(10.9°C)		3.7°F
(2.0°C)		126th Coolest
Coolest since:
1904
2nd Warmest
Warmest since:
2012
Apr 2015–Sep 2016
18-Month		59.5°F
(15.3°C)		56.7°F
(13.7°C)		2.8°F
(1.6°C)		126th Coolest
Coolest since:
1904, 1918
2nd Warmest
Warmest since:
2012
Ties: 2017
Oct 2014–Sep 2016
24-Month		53.2°F
(11.8°C)		51.6°F
(10.9°C)		1.6°F
(0.9°C)		112th Coolest
Coolest since:
1979
15th Warmest
Warmest since:
2017
Ties: 1988, 1991
Oct 2013–Sep 2016
36-Month		51.9°F
(11.1°C)		51.6°F
(10.9°C)		0.3°F
(0.2°C)		74th Coolest
Coolest since:
1979
52nd Warmest
Warmest since:
2018
Ties: 1915, 1948, 1985
Oct 2012–Sep 2016
48-Month		51.9°F
(11.1°C)		51.6°F
(10.9°C)		0.3°F
(0.2°C)		73rd Coolest
Coolest since:
1905
52nd Warmest
Warmest since:
2019
Ties: 1921, 1937, 1938, 1943, 1975, 1994
Oct 2011–Sep 2016
60-Month		52.8°F
(11.6°C)		51.6°F
(10.9°C)		1.2°F
(0.7°C)		111th Coolest
Coolest since:
1906
13th Warmest
Warmest since:
2020
Ties: 1957, 1991, 2009, 2022

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