Statewide Rankings

Statewide 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

Average Temperature Rankings, August 2021

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
August 2021
1-Month		75.6°F
(24.2°C)		73.4°F
(23.0°C)		2.2°F
(1.2°C)		109th Coolest
Coolest since:
1915
20th Warmest
Warmest since:
1947
Ties: 2005
Jul–Aug 2021
2-Month		75.1°F
(23.9°C)		74.5°F
(23.6°C)		0.6°F
(0.3°C)		85th Coolest
Coolest since:
1915
44th Warmest
Warmest since:
1936
Ties: 1940, 1998, 2003, 2019, 2020
Jun–Aug 2021
3-Month		74.8°F
(23.8°C)		73.5°F
(23.1°C)		1.3°F
(0.7°C)		99th Coolest
Coolest since:
1915
30th Warmest
Warmest since:
1936
Ties: 1959
May–Aug 2021
4-Month		71.4°F
(21.9°C)		70.6°F
(21.4°C)		0.8°F
(0.5°C)		82nd Coolest
Coolest since:
1915
47th Warmest
Warmest since:
1936
Ties: 1916, 1937, 2006
Apr–Aug 2021
5-Month		67.6°F
(19.8°C)		66.8°F
(19.3°C)		0.8°F
(0.5°C)		86th Coolest
Coolest since:
1907
43rd Warmest
Warmest since:
1934
Ties: 1962, 2022
Mar–Aug 2021
6-Month		64.0°F
(17.8°C)		62.3°F
(16.8°C)		1.7°F
(1.0°C)		113th Coolest
Coolest since:
1950, 1960
16th Warmest
Warmest since:
2012
Ties: 1986
Feb–Aug 2021
7-Month		57.8°F
(14.3°C)		57.6°F
(14.2°C)		0.2°F
(0.1°C)		71st Coolest
Coolest since:
1904
58th Warmest
Warmest since:
2012
Ties: 1939
Jan–Aug 2021
8-Month		54.3°F
(12.4°C)		53.6°F
(12.0°C)		0.7°F
(0.4°C)		81st Coolest
Coolest since:
1912
48th Warmest
Warmest since:
2012
Dec 2020–Aug 2021
9-Month		51.9°F
(11.1°C)		50.9°F
(10.5°C)		1.0°F
(0.6°C)		88th Coolest
Coolest since:
1904
40th Warmest
Warmest since:
2012
Ties: 1944, 1992
Nov 2020–Aug 2021
10-Month		51.5°F
(10.8°C)		49.9°F
(9.9°C)		1.6°F
(0.9°C)		104th Coolest
Coolest since:
1904
24th Warmest
Warmest since:
2012
Ties: 1949, 1988
Oct 2020–Aug 2021
11-Month		51.5°F
(10.8°C)		50.3°F
(10.2°C)		1.2°F
(0.6°C)		98th Coolest
Coolest since:
1904
30th Warmest
Warmest since:
2012
Ties: 1949, 1957
Sep 2020–Aug 2021
12-Month		52.7°F
(11.5°C)		51.6°F
(10.9°C)		1.1°F
(0.6°C)		98th Coolest
Coolest since:
1904
30th Warmest
Warmest since:
2012
Ties: 1919, 1931, 1941
Mar 2020–Aug 2021
18-Month		56.1°F
(13.4°C)		55.2°F
(12.9°C)		0.9°F
(0.5°C)		92nd Coolest
Coolest since:
1904
36th Warmest
Warmest since:
2012
Ties: 1949, 1964
Sep 2019–Aug 2021
24-Month		53.0°F
(11.7°C)		51.6°F
(10.9°C)		1.4°F
(0.8°C)		108th Coolest
Coolest since:
1905
19th Warmest
Warmest since:
2017
Ties: 1942, 1991, 2016
Sep 2018–Aug 2021
36-Month		52.6°F
(11.4°C)		51.6°F
(10.9°C)		1.0°F
(0.5°C)		101st Coolest
Coolest since:
1979
25th Warmest
Warmest since:
2018
Ties: 1922, 1935, 1987, 2004, 2005
Sep 2017–Aug 2021
48-Month		52.7°F
(11.5°C)		51.6°F
(10.9°C)		1.1°F
(0.6°C)		105th Coolest
Coolest since:
1905
20th Warmest
Warmest since:
2019
Ties: 2003, 2017
Sep 2016–Aug 2021
60-Month		53.2°F
(11.8°C)		51.6°F
(10.9°C)		1.6°F
(0.9°C)		121st Coolest
Coolest since:
1906
3rd Warmest
Warmest since:
2020
Ties: 2006, 2019

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