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 3. West

Average Temperature Rankings, December 2020

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
December 2020
1-Month		31.6°F
(-0.2°C)		28.3°F
(-2.1°C)		3.3°F
(1.9°C)		89th Coolest
Coolest since:
1983
40th Warmest
Warmest since:
2015
Ties: 1947, 1975
Nov–Dec 2020
2-Month		39.1°F
(3.9°C)		34.3°F
(1.3°C)		4.8°F
(2.6°C)		117th Coolest
Coolest since:
2000
12th Warmest
Warmest since:
1931
Oct–Dec 2020
3-Month		42.9°F
(6.1°C)		41.0°F
(5.0°C)		1.9°F
(1.1°C)		98th Coolest
Coolest since:
1976
31st Warmest
Warmest since:
1931
Ties: 1912, 1923
Sep–Dec 2020
4-Month		48.3°F
(9.1°C)		47.3°F
(8.5°C)		1.0°F
(0.6°C)		82nd Coolest
Coolest since:
1976
47th Warmest
Warmest since:
1931
Ties: 1930, 1979
Aug–Dec 2020
5-Month		53.2°F
(11.8°C)		52.5°F
(11.4°C)		0.7°F
(0.4°C)		79th Coolest
Coolest since:
1976
50th Warmest
Warmest since:
1931
Ties: 1897, 1980, 2010, 2019
Jul–Dec 2020
6-Month		57.2°F
(14.0°C)		56.5°F
(13.6°C)		0.7°F
(0.4°C)		83rd Coolest
Coolest since:
1976
46th Warmest
Warmest since:
1931
Ties: 1908, 1914, 1973, 1982, 2003, 2010
Jun–Dec 2020
7-Month		59.5°F
(15.3°C)		58.6°F
(14.8°C)		0.9°F
(0.5°C)		89th Coolest
Coolest since:
1976
40th Warmest
Warmest since:
1931
Ties: 1975, 1980, 2006
May–Dec 2020
8-Month		59.6°F
(15.3°C)		59.1°F
(15.1°C)		0.5°F
(0.2°C)		80th Coolest
Coolest since:
1917
49th Warmest
Warmest since:
1931
Ties: 1948, 1962, 1982, 1984, 2019, 2022
Apr–Dec 2020
9-Month		58.4°F
(14.7°C)		58.2°F
(14.6°C)		0.2°F
(0.1°C)		61st Coolest
Coolest since:
1917
68th Warmest
Warmest since:
1931
Ties: 1944, 2003, 2004
Mar–Dec 2020
10-Month		56.9°F
(13.8°C)		56.3°F
(13.5°C)		0.6°F
(0.3°C)		82nd Coolest
Coolest since:
1917
47th Warmest
Warmest since:
2012
Ties: 1959, 2018
Feb–Dec 2020
11-Month		54.5°F
(12.5°C)		53.7°F
(12.1°C)		0.8°F
(0.4°C)		90th Coolest
Coolest since:
1917
39th Warmest
Warmest since:
2012
Ties: 1957, 1986, 1994
Jan–Dec 2020
12-Month		52.4°F
(11.3°C)		51.2°F
(10.7°C)		1.2°F
(0.6°C)		101st Coolest
Coolest since:
1917
28th Warmest
Warmest since:
2012
Ties: 1911, 1956, 2015
Jul 2019–Dec 2020
18-Month		54.0°F
(12.2°C)		53.0°F
(11.7°C)		1.0°F
(0.5°C)		101st Coolest
Coolest since:
1904
27th Warmest
Warmest since:
2012
Ties: 1949
Jan 2019–Dec 2020
24-Month		51.8°F
(11.0°C)		51.2°F
(10.7°C)		0.6°F
(0.3°C)		88th Coolest
Coolest since:
1979
40th Warmest
Warmest since:
2017
Ties: 1941, 1946
Jan 2018–Dec 2020
36-Month		51.8°F
(11.0°C)		51.2°F
(10.7°C)		0.6°F
(0.3°C)		87th Coolest
Coolest since:
1905
40th Warmest
Warmest since:
2017
Ties: 1915, 1946, 2004
Jan 2017–Dec 2020
48-Month		52.3°F
(11.3°C)		51.2°F
(10.7°C)		1.1°F
(0.6°C)		107th Coolest
Coolest since:
1905
19th Warmest
Warmest since:
1934
Ties: 1935, 1939, 1957
Jan 2016–Dec 2020
60-Month		52.6°F
(11.4°C)		51.2°F
(10.7°C)		1.4°F
(0.7°C)		121st Coolest
Coolest since:
1905
4th Warmest
Warmest since:
1934
Ties: 1956, 2019

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