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 2021

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
August 2021
1-Month 		77.5°F
(25.3°C)		 76.0°F
(24.4°C)		 1.5°F
(0.9°C)		 96th Coolest
Coolest since:
 1915
33rd Warmest
Warmest since:
 1936
Ties: 1914, 2001
Jul–Aug 2021
2-Month 		77.3°F
(25.2°C)		 77.0°F
(25.0°C)		 0.3°F
(0.2°C)		 77th Coolest
Coolest since:
 1967
52nd Warmest
Warmest since:
 1936
Ties: 1899
Jun–Aug 2021
3-Month 		76.8°F
(24.9°C)		 75.9°F
(24.4°C)		 0.9°F
(0.5°C)		 91st Coolest
Coolest since:
 1915, 1927
38th Warmest
Warmest since:
 1936
May–Aug 2021
4-Month 		73.6°F
(23.1°C)		 73.2°F
(22.9°C)		 0.4°F
(0.2°C)		 71st Coolest
Coolest since:
 1967
58th Warmest
Warmest since:
 1936
Ties: 1931, 1939, 1957, 1965, 1975
Apr–Aug 2021
5-Month 		70.0°F
(21.1°C)		 69.6°F
(20.9°C)		 0.4°F
(0.2°C)		 75th Coolest
Coolest since:
 1907
54th Warmest
Warmest since:
 2010
Ties: 1931, 1981
Mar–Aug 2021
6-Month 		66.8°F
(19.3°C)		 65.5°F
(18.6°C)		 1.3°F
(0.7°C)		 104th Coolest
Coolest since:
 1904
25th Warmest
Warmest since:
 2012
Ties: 1941
Feb–Aug 2021
7-Month 		61.0°F
(16.1°C)		 61.1°F
(16.2°C)		 -0.1°F
(-0.1°C)		 58th Coolest
Coolest since:
 1904
71st Warmest
Warmest since:
 2012
Ties: 1898
Jan–Aug 2021
8-Month 		57.7°F
(14.3°C)		 57.3°F
(14.1°C)		 0.4°F
(0.2°C)		 71st Coolest
Coolest since:
 1912
58th Warmest
Warmest since:
 2012
Ties: 1956, 1981, 1983, 2004
Dec 2020–Aug 2021
9-Month 		55.4°F
(13.0°C)		 54.8°F
(12.7°C)		 0.6°F
(0.3°C)		 79th Coolest
Coolest since:
 1904
49th Warmest
Warmest since:
 2012
Ties: 1909, 1931, 1976, 1988
Nov 2020–Aug 2021
10-Month 		54.9°F
(12.7°C)		 53.8°F
(12.1°C)		 1.1°F
(0.6°C)		 99th Coolest
Coolest since:
 1904
29th Warmest
Warmest since:
 2012
Ties: 1941, 1986, 2004, 2011
Oct 2020–Aug 2021
11-Month 		55.0°F
(12.8°C)		 54.1°F
(12.3°C)		 0.9°F
(0.5°C)		 87th Coolest
Coolest since:
 1904
41st Warmest
Warmest since:
 2012
Ties: 1935, 1964
Sep 2020–Aug 2021
12-Month 		56.1°F
(13.4°C)		 55.4°F
(13.0°C)		 0.7°F
(0.4°C)		 89th Coolest
Coolest since:
 1904
39th Warmest
Warmest since:
 2012
Ties: 1909, 1911, 1919, 1946, 1952, 1964, 1983, 1992, 2004
Mar 2020–Aug 2021
18-Month 		59.4°F
(15.2°C)		 58.7°F
(14.8°C)		 0.7°F
(0.4°C)		 85th Coolest
Coolest since:
 1904
43rd Warmest
Warmest since:
 2012
Ties: 1938
Sep 2019–Aug 2021
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: 1991, 2011, 2019
Sep 2018–Aug 2021
36-Month 		56.4°F
(13.6°C)		 55.4°F
(13.0°C)		 1.0°F
(0.6°C)		 104th Coolest
Coolest since:
 1979
22nd Warmest
Warmest since:
 2018
Ties: 1943, 1988, 1992
Sep 2017–Aug 2021
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, 2009
Sep 2016–Aug 2021
60-Month 		56.9°F
(13.8°C)		 55.3°F
(12.9°C)		 1.6°F
(0.9°C)		 121st Coolest
Coolest since:
 1906
3rd Warmest
Warmest since:
 2020
Ties: 1934, 1935, 2002

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