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

View Period (Months):
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  • Record Coolest
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  • Normal
  • Top 1/3
  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
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)
88th Coolest
Coolest since:
1983
40th Warmest
Warmest since:
2015
Ties: 1947, 1975
Nov–Dec 2020
2-Month
39.1°F
(3.9°C)
34.2°F
(1.2°C)
4.9°F
(2.7°C)
116th 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)
97th Coolest
Coolest since:
1976
31st Warmest
Warmest since:
1931
Ties: 1912, 1923
Sep–Dec 2020
4-Month
48.3°F
(9.1°C)
47.2°F
(8.4°C)
1.1°F
(0.7°C)
81st 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)
78th 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
45th Warmest
Warmest since:
1931
Ties: 1908, 1973, 1982, 1984, 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)
88th 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)
79th Coolest
Coolest since:
1917
49th Warmest
Warmest since:
1931
Ties: 1948, 1962, 1982, 1984, 2019
Apr–Dec 2020
9-Month
58.4°F
(14.7°C)
58.2°F
(14.6°C)
0.2°F
(0.1°C)
60th 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)
81st 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)
89th 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)
100th 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)
52.9°F
(11.6°C)
1.1°F
(0.6°C)
101st Coolest
Coolest since:
1904
26th Warmest
Warmest since:
2012
Ties: 1949, 1955
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
39th Warmest
Warmest since:
2017
Ties: 1941, 1946
Jan 2018–Dec 2020
36-Month
51.8°F
(11.0°C)
51.3°F
(10.7°C)
0.5°F
(0.3°C)
87th Coolest
Coolest since:
1905
39th Warmest
Warmest since:
2017
Ties: 1915, 1946, 2004
Jan 2017–Dec 2020
48-Month
52.3°F
(11.3°C)
51.3°F
(10.7°C)
1.0°F
(0.6°C)
106th 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)
120th Coolest
Coolest since:
1905
4th Warmest
Warmest since:
1934
Ties: 1956, 2019

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