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, September 2021

View Period (Months):
Download: csv json xml
  • Record Coolest
  • Bottom 1/10
  • Bottom 1/3
  • Normal
  • Top 1/3
  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Warmest/Coolest
Since
Record
September 2021
1-Month
69.6°F
(20.9°C)
66.2°F
(19.0°C)
3.4°F
(1.9°C)
110th Coolest
Coolest since:
1918
19th Warmest
Warmest since:
1925, 1933
Ties: 1895, 1954
Aug–Sep 2021
2-Month
72.6°F
(22.6°C)
69.8°F
(21.0°C)
2.8°F
(1.6°C)
117th Coolest
Coolest since:
1967
12th Warmest
Warmest since:
1936
Ties: 1906
Jul–Sep 2021
3-Month
73.3°F
(22.9°C)
71.8°F
(22.1°C)
1.5°F
(0.8°C)
102nd Coolest
Coolest since:
1967
27th Warmest
Warmest since:
1936
Ties: 2018
Jun–Sep 2021
4-Month
73.5°F
(23.1°C)
71.7°F
(22.1°C)
1.8°F
(1.0°C)
110th Coolest
Coolest since:
1915, 1924
19th Warmest
Warmest since:
1936
Ties: 1914, 2007
May–Sep 2021
5-Month
71.0°F
(21.7°C)
69.7°F
(20.9°C)
1.3°F
(0.8°C)
95th Coolest
Coolest since:
1924
34th Warmest
Warmest since:
1936
Ties: 2019, 2022
Apr–Sep 2021
6-Month
67.9°F
(19.9°C)
66.7°F
(19.3°C)
1.2°F
(0.6°C)
97th Coolest
Coolest since:
1907
32nd Warmest
Warmest since:
2010
Ties: 1944, 1980, 2015, 2019
Mar–Sep 2021
7-Month
64.8°F
(18.2°C)
62.8°F
(17.1°C)
2.0°F
(1.1°C)
117th Coolest
Coolest since:
1924
12th Warmest
Warmest since:
2012
Ties: 1925, 1998
Feb–Sep 2021
8-Month
59.3°F
(15.2°C)
58.6°F
(14.8°C)
0.7°F
(0.4°C)
81st Coolest
Coolest since:
1904
48th Warmest
Warmest since:
2012
Ties: 1896, 1995, 2004, 2019
Jan–Sep 2021
9-Month
56.0°F
(13.3°C)
54.9°F
(12.7°C)
1.1°F
(0.6°C)
89th Coolest
Coolest since:
1904, 1912
40th Warmest
Warmest since:
2012
Dec 2020–Sep 2021
10-Month
53.7°F
(12.1°C)
52.4°F
(11.3°C)
1.3°F
(0.8°C)
98th Coolest
Coolest since:
1904
30th Warmest
Warmest since:
2012
Ties: 1911, 1988
Nov 2020–Sep 2021
11-Month
53.1°F
(11.7°C)
51.4°F
(10.8°C)
1.7°F
(0.9°C)
108th Coolest
Coolest since:
1904
20th Warmest
Warmest since:
2012
Ties: 1931, 1955
Oct 2020–Sep 2021
12-Month
53.0°F
(11.7°C)
51.6°F
(10.9°C)
1.4°F
(0.8°C)
105th Coolest
Coolest since:
1904
23rd Warmest
Warmest since:
2012
Ties: 1925, 1931, 1941, 1953
Apr 2020–Sep 2021
18-Month
57.5°F
(14.2°C)
56.6°F
(13.7°C)
0.9°F
(0.5°C)
94th Coolest
Coolest since:
1904, 1918
34th Warmest
Warmest since:
2012
Ties: 1937, 1983, 1995, 2019
Oct 2019–Sep 2021
24-Month
52.9°F
(11.6°C)
51.6°F
(10.9°C)
1.3°F
(0.7°C)
105th Coolest
Coolest since:
1979
22nd Warmest
Warmest since:
2017
Ties: 1934, 1942, 2002
Oct 2018–Sep 2021
36-Month
52.6°F
(11.4°C)
51.6°F
(10.9°C)
1.0°F
(0.5°C)
99th Coolest
Coolest since:
1979
27th Warmest
Warmest since:
2018
Ties: 1922, 2005, 2020
Oct 2017–Sep 2021
48-Month
52.7°F
(11.5°C)
51.6°F
(10.9°C)
1.1°F
(0.6°C)
104th Coolest
Coolest since:
1905
21st Warmest
Warmest since:
2019
Ties: 1988, 2003, 2017
Oct 2016–Sep 2021
60-Month
53.1°F
(11.7°C)
51.5°F
(10.8°C)
1.6°F
(0.9°C)
118th Coolest
Coolest since:
1906
6th Warmest
Warmest since:
2020
Ties: 1934, 1935

Citing This Page