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 1991

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
August 1991
1-Month 		76.8°F
(24.9°C)		 76.0°F
(24.4°C)		 0.8°F
(0.5°C)		 86th Coolest
Coolest since:
 1915
43rd Warmest
Warmest since:
 1936
Ties: 1901, 1932, 1953, 2012
Jul–Aug 1991
2-Month 		77.6°F
(25.3°C)		 77.0°F
(25.0°C)		 0.6°F
(0.3°C)		 87th Coolest
Coolest since:
 1967
42nd Warmest
Warmest since:
 1936
Ties: 1977, 1999, 2019
Jun–Aug 1991
3-Month 		77.2°F
(25.1°C)		 75.9°F
(24.4°C)		 1.3°F
(0.7°C)		 99th Coolest
Coolest since:
 1915, 1927
30th Warmest
Warmest since:
 1936
Ties: 1993
May–Aug 1991
4-Month 		75.6°F
(24.2°C)		 73.2°F
(22.9°C)		 2.4°F
(1.3°C)		 119th Coolest
Coolest since:
 1967
10th Warmest
Warmest since:
 1936
Ties: 1941, 1980, 2011
Apr–Aug 1991
5-Month 		72.3°F
(22.4°C)		 69.6°F
(20.9°C)		 2.7°F
(1.5°C)		 123rd Coolest
Coolest since:
 1907
6th Warmest
Warmest since:
 2010
Ties: 1941, 2011
Mar–Aug 1991
6-Month 		68.4°F
(20.2°C)		 65.5°F
(18.6°C)		 2.9°F
(1.6°C)		 125th Coolest
Coolest since:
 1904
4th Warmest
Warmest since:
 2012
Ties: 2007
Feb–Aug 1991
7-Month 		64.3°F
(17.9°C)		 61.1°F
(16.2°C)		 3.2°F
(1.7°C)		 127th Coolest
Coolest since:
 1904
2nd Warmest
Warmest to Date
 2012
Jan–Aug 1991
8-Month 		59.9°F
(15.5°C)		 57.3°F
(14.1°C)		 2.6°F
(1.4°C)		 121st Coolest
Coolest since:
 1912
8th Warmest
Warmest since:
 2012
Ties: 1953, 2016
Dec 1990–Aug 1991
9-Month 		57.2°F
(14.0°C)		 54.8°F
(12.7°C)		 2.4°F
(1.3°C)		 118th Coolest
Coolest since:
 1904
10th Warmest
Warmest since:
 2012
Nov 1990–Aug 1991
10-Month 		56.5°F
(13.6°C)		 53.8°F
(12.1°C)		 2.7°F
(1.5°C)		 122nd Coolest
Coolest since:
 1904
6th Warmest
Warmest since:
 2012
Ties: 2002
Oct 1990–Aug 1991
11-Month 		56.4°F
(13.6°C)		 54.1°F
(12.3°C)		 2.3°F
(1.3°C)		 119th Coolest
Coolest since:
 1904
9th Warmest
Warmest since:
 2012
Ties: 2005, 2006
Sep 1990–Aug 1991
12-Month 		57.6°F
(14.2°C)		 55.4°F
(13.0°C)		 2.2°F
(1.2°C)		 119th Coolest
Coolest since:
 1904
9th Warmest
Warmest since:
 2012
Ties: 1934, 1999
Mar 1990–Aug 1991
18-Month 		60.1°F
(15.6°C)		 58.7°F
(14.8°C)		 1.4°F
(0.8°C)		 107th Coolest
Coolest since:
 1904
21st Warmest
Warmest since:
 2012
Ties: 2008, 2018
Sep 1989–Aug 1991
24-Month 		56.5°F
(13.6°C)		 55.4°F
(13.0°C)		 1.1°F
(0.6°C)		 103rd Coolest
Coolest since:
 1979
24th Warmest
Warmest since:
 2017
Ties: 2011, 2019, 2021
Sep 1988–Aug 1991
36-Month 		56.0°F
(13.3°C)		 55.4°F
(13.0°C)		 0.6°F
(0.3°C)		 88th Coolest
Coolest since:
 1979
38th Warmest
Warmest since:
 2018
Ties: 1921, 2009
Sep 1987–Aug 1991
48-Month 		56.0°F
(13.3°C)		 55.3°F
(12.9°C)		 0.7°F
(0.4°C)		 88th Coolest
Coolest since:
 1980
37th Warmest
Warmest since:
 2019
Ties: 1939, 1941, 1989, 1992, 1993, 2015
Sep 1986–Aug 1991
60-Month 		56.2°F
(13.4°C)		 55.3°F
(12.9°C)		 0.9°F
(0.5°C)		 100th Coolest
Coolest since:
 1906
24th Warmest
Warmest since:
 2020
Ties: 1925, 1933, 1955, 2004, 2005, 2011

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