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

View Period (Months):
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  • Top 1/3
  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
August 2021
1-Month
77.4°F
(25.2°C)
76.0°F
(24.4°C)
1.4°F
(0.8°C)
94th Coolest
Coolest since:
1915
35th Warmest
Warmest since:
1936
Ties: 1926
Jul–Aug 2021
2-Month
77.2°F
(25.1°C)
77.0°F
(25.0°C)
0.2°F
(0.1°C)
77th Coolest
Coolest since:
1967
52nd Warmest
Warmest since:
1936
Ties: 1896, 1899, 1928, 2020
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
73.5°F
(23.1°C)
73.2°F
(22.9°C)
0.3°F
(0.2°C)
67th Coolest
Coolest since:
1967
62nd Warmest
Warmest since:
1936
Ties: 1975
Apr–Aug 2021
5-Month
69.9°F
(21.1°C)
69.6°F
(20.9°C)
0.3°F
(0.2°C)
73rd Coolest
Coolest since:
1907
56th Warmest
Warmest since:
2010
Ties: 1942, 1948, 1949, 1970, 2000
Mar–Aug 2021
6-Month
66.7°F
(19.3°C)
65.4°F
(18.6°C)
1.3°F
(0.7°C)
103rd Coolest
Coolest since:
1904
26th Warmest
Warmest since:
2012
Ties: 1922, 1988, 1998
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)
57.4°F
(14.1°C)
0.3°F
(0.2°C)
71st Coolest
Coolest since:
1912
58th Warmest
Warmest since:
2012
Ties: 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
54.9°F
(12.7°C)
54.1°F
(12.3°C)
0.8°F
(0.4°C)
85th Coolest
Coolest since:
1904
43rd Warmest
Warmest since:
2012
Ties: 1943, 1946, 1992
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, 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
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
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)
55.4°F
(13.0°C)
1.1°F
(0.6°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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