Divisional Rankings

Divisional 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, Climate Division 8. Southwest

Average Temperature Rankings, August 2017

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  • Record Warmest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
August 2017
1-Month 		73.3°F
(22.9°C)		 76.0°F
(24.4°C)		 -2.7°F
(-1.5°C)		 14th Coolest
Coolest since:
 1915
115th Warmest
Warmest since:
 1936
Jul–Aug 2017
2-Month 		76.4°F
(24.7°C)		 77.0°F
(25.0°C)		 -0.6°F
(-0.3°C)		 45th Coolest
Coolest since:
 1967
84th Warmest
Warmest since:
 1936
Ties: 1902, 1908, 1942, 1948, 1960, 1962, 2015
Jun–Aug 2017
3-Month 		75.8°F
(24.3°C)		 76.0°F
(24.4°C)		 -0.2°F
(-0.1°C)		 56th Coolest
Coolest since:
 1915, 1927
73rd Warmest
Warmest since:
 1936
Ties: 1897, 1898, 1939, 1940, 2008
May–Aug 2017
4-Month 		73.3°F
(22.9°C)		 73.2°F
(22.9°C)		 0.1°F
(0.0°C)		 62nd Coolest
Coolest since:
 1967
67th Warmest
Warmest since:
 1936
Ties: 1898, 1996, 2020
Apr–Aug 2017
5-Month 		70.7°F
(21.5°C)		 69.6°F
(20.9°C)		 1.1°F
(0.6°C)		 88th Coolest
Coolest since:
 1907
41st Warmest
Warmest since:
 2010
Ties: 1938, 1965
Mar–Aug 2017
6-Month 		67.0°F
(19.4°C)		 65.5°F
(18.6°C)		 1.5°F
(0.8°C)		 111th Coolest
Coolest since:
 1904
18th Warmest
Warmest since:
 2012
Ties: 1914, 1925, 1955, 2022
Feb–Aug 2017
7-Month 		64.0°F
(17.8°C)		 61.1°F
(16.2°C)		 2.9°F
(1.6°C)		 124th Coolest
Coolest since:
 1904
5th Warmest
Warmest since:
 2012
Ties: 1954
Jan–Aug 2017
8-Month 		60.7°F
(15.9°C)		 57.3°F
(14.1°C)		 3.4°F
(1.8°C)		 127th Coolest
Coolest since:
 1912
2nd Warmest
Warmest since:
 2012
Ties: 1921
Dec 2016–Aug 2017
9-Month 		57.8°F
(14.3°C)		 54.8°F
(12.7°C)		 3.0°F
(1.6°C)		 123rd Coolest
Coolest since:
 1904
5th Warmest
Warmest since:
 2012
Nov 2016–Aug 2017
10-Month 		57.0°F
(13.9°C)		 53.8°F
(12.1°C)		 3.2°F
(1.8°C)		 124th Coolest
Coolest since:
 1904
4th Warmest
Warmest since:
 2012
Oct 2016–Aug 2017
11-Month 		57.6°F
(14.2°C)		 54.2°F
(12.3°C)		 3.4°F
(1.9°C)		 125th Coolest
Coolest since:
 1904
3rd Warmest
Warmest since:
 2012
Ties: 2016
Sep 2016–Aug 2017
12-Month 		58.8°F
(14.9°C)		 55.4°F
(13.0°C)		 3.4°F
(1.9°C)		 125th Coolest
Coolest since:
 1904
3rd Warmest
Warmest since:
 2012
Ties: 2016
Mar 2016–Aug 2017
18-Month 		61.9°F
(16.6°C)		 58.8°F
(14.9°C)		 3.1°F
(1.7°C)		 126th Coolest
Coolest since:
 1904
2nd Warmest
Warmest since:
 2012
Sep 2015–Aug 2017
24-Month 		58.8°F
(14.9°C)		 55.4°F
(13.0°C)		 3.4°F
(1.9°C)		 126th Coolest
Coolest since:
 1979
1st Warmest
Warmest to Date
 2017
Sep 2014–Aug 2017
36-Month 		57.5°F
(14.2°C)		 55.4°F
(13.0°C)		 2.1°F
(1.2°C)		 122nd Coolest
Coolest since:
 1979
4th Warmest
Warmest since:
 2018
Sep 2013–Aug 2017
48-Month 		56.6°F
(13.7°C)		 55.3°F
(12.9°C)		 1.3°F
(0.8°C)		 109th Coolest
Coolest since:
 1980
16th Warmest
Warmest since:
 2019
Ties: 1957, 2000, 2006
Sep 2012–Aug 2017
60-Month 		56.3°F
(13.5°C)		 55.3°F
(12.9°C)		 1.0°F
(0.6°C)		 102nd Coolest
Coolest since:
 1906
22nd Warmest
Warmest since:
 2020
Ties: 2001

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