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 2009

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
August 2009
1-Month		73.6°F
(23.1°C)		76.0°F
(24.4°C)		-2.4°F
(-1.3°C)		16th Coolest
Coolest since:
1915
113th Warmest
Warmest since:
1936
Jul–Aug 2009
2-Month		73.7°F
(23.2°C)		77.0°F
(25.0°C)		-3.3°F
(-1.8°C)		7th Coolest
Coolest since:
1967
122nd Warmest
Warmest since:
1936
Jun–Aug 2009
3-Month		74.6°F
(23.7°C)		75.9°F
(24.4°C)		-1.3°F
(-0.7°C)		23rd Coolest
Coolest since:
1915, 1927
106th Warmest
Warmest since:
1936
Ties: 1907, 1970, 1997
May–Aug 2009
4-Month		72.3°F
(22.4°C)		73.2°F
(22.9°C)		-0.9°F
(-0.5°C)		34th Coolest
Coolest since:
1967
95th Warmest
Warmest since:
1936
Ties: 1966, 2003
Apr–Aug 2009
5-Month		68.9°F
(20.5°C)		69.6°F
(20.9°C)		-0.7°F
(-0.4°C)		32nd Coolest
Coolest since:
1907
97th Warmest
Warmest since:
2010
Ties: 1984, 2013
Mar–Aug 2009
6-Month		65.5°F
(18.6°C)		65.5°F
(18.6°C)		0.0°F
(0.0°C)		60th Coolest
Coolest since:
1904
69th Warmest
Warmest since:
2012
Ties: 1949, 2003
Feb–Aug 2009
7-Month		61.6°F
(16.4°C)		61.1°F
(16.2°C)		0.5°F
(0.2°C)		79th Coolest
Coolest since:
1904
50th Warmest
Warmest since:
2012
Ties: 1908, 1974, 1990
Jan–Aug 2009
8-Month		57.5°F
(14.2°C)		57.3°F
(14.1°C)		0.2°F
(0.1°C)		62nd Coolest
Coolest since:
1912
67th Warmest
Warmest since:
2012
Ties: 1942
Dec 2008–Aug 2009
9-Month		54.8°F
(12.7°C)		54.8°F
(12.7°C)		0.0°F
(0.0°C)		58th Coolest
Coolest since:
1904
70th Warmest
Warmest since:
2012
Ties: 1956, 1975, 1989
Nov 2008–Aug 2009
10-Month		53.7°F
(12.1°C)		53.8°F
(12.1°C)		-0.1°F
(0.0°C)		53rd Coolest
Coolest since:
1904
75th Warmest
Warmest since:
2012
Ties: 1947, 1950
Oct 2008–Aug 2009
11-Month		54.0°F
(12.2°C)		54.1°F
(12.3°C)		-0.1°F
(-0.1°C)		51st Coolest
Coolest since:
1904
77th Warmest
Warmest since:
2012
Ties: 1980
Sep 2008–Aug 2009
12-Month		55.3°F
(12.9°C)		55.4°F
(13.0°C)		-0.1°F
(-0.1°C)		52nd Coolest
Coolest since:
1904
76th Warmest
Warmest since:
2012
Ties: 1928, 1944, 1962, 1966, 2013
Mar 2008–Aug 2009
18-Month		58.4°F
(14.7°C)		58.7°F
(14.8°C)		-0.3°F
(-0.1°C)		44th Coolest
Coolest since:
1904
84th Warmest
Warmest since:
2012
Ties: 1906, 1950, 1959, 1973, 1975
Sep 2007–Aug 2009
24-Month		55.6°F
(13.1°C)		55.4°F
(13.0°C)		0.2°F
(0.1°C)		76th Coolest
Coolest since:
1979
51st Warmest
Warmest since:
2017
Ties: 1936, 1944, 1965, 1975, 1998
Sep 2006–Aug 2009
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, 1991
Sep 2005–Aug 2009
48-Month		56.5°F
(13.6°C)		55.3°F
(12.9°C)		1.2°F
(0.7°C)		105th Coolest
Coolest since:
1980
20th Warmest
Warmest since:
2019
Ties: 2005, 2021
Sep 2004–Aug 2009
60-Month		56.7°F
(13.7°C)		55.3°F
(12.9°C)		1.4°F
(0.8°C)		114th Coolest
Coolest since:
1906
10th Warmest
Warmest since:
2020
Ties: 2006, 2013

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