Climate at a Glance

Statewide Rankings

Look up monthly rankings for 1-12, 18, 24, 36, 48, and 60-month time periods using the options below. Data and statistics are as of August 2021. For more information, please see Climatological Rankings.


Illinois

Average Temperature Rankings, September 1999

View Period (Months):All1234567891011121824364860
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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2020)
Warmest/Coolest
Since
Record
September 1999
1-Month
65.2°F
(18.4°C)
66.2°F
(19.0°C)
-1.0°F
(-0.6°C)
41st Coolest Coolest since: 1996 1918
86th Warmest Warmest since: 1998 1925, 1933
Ties: 1968
Aug–Sep 1999
2-Month
68.4°F
(20.2°C)
69.8°F
(21.0°C)
-1.4°F
(-0.8°C)
27th Coolest Coolest since: 1994 1967
100th Warmest Warmest since: 1998 1936
Ties: 1907, 1918, 1942, 2009
Jul–Sep 1999
3-Month
71.8°F
(22.1°C)
71.7°F
(22.1°C)
0.1°F
(0.0°C)
68th Coolest Coolest since: 1997 1967
59th Warmest Warmest since: 1998 1936
Ties: 1932, 1952, 2006, 2017
Jun–Sep 1999
4-Month
71.9°F
(22.2°C)
71.6°F
(22.0°C)
0.3°F
(0.2°C)
70th Coolest Coolest since: 1997 1915, 1924
57th Warmest Warmest since: 1998 1936
Ties: 1977
May–Sep 1999
5-Month
70.4°F
(21.3°C)
69.8°F
(21.0°C)
0.6°F
(0.3°C)
83rd Coolest Coolest since: 1997 1924
44th Warmest Warmest since: 1998 1936
Ties: 1932, 1970
Apr–Sep 1999
6-Month
67.7°F
(19.8°C)
66.7°F
(19.3°C)
1.0°F
(0.5°C)
88th Coolest Coolest since: 1997 1907
39th Warmest Warmest since: 1998 2010
Ties: 1952, 1953, 2006, 2011
Mar–Sep 1999
7-Month
63.5°F
(17.5°C)
62.9°F
(17.2°C)
0.6°F
(0.3°C)
85th Coolest Coolest since: 1997 1924
42nd Warmest Warmest since: 1998 2012
Ties: 1895, 1896, 1908, 1913, 1963, 1995, 2001, 2004
Feb–Sep 1999
8-Month
60.2°F
(15.7°C)
58.6°F
(14.8°C)
1.6°F
(0.9°C)
109th Coolest Coolest since: 1997 1904
18th Warmest Warmest since: 1998 2012
Ties: 1931, 1953, 1986, 2002, 2007, 2018
Jan–Sep 1999
9-Month
56.3°F
(13.5°C)
54.9°F
(12.7°C)
1.4°F
(0.8°C)
96th Coolest Coolest since: 1997 1904, 1912
31st Warmest Warmest since: 1998 2012
Ties: 1930, 1944, 1983
Dec 1998–Sep 1999
10-Month
54.2°F
(12.3°C)
52.4°F
(11.3°C)
1.8°F
(1.0°C)
103rd Coolest Coolest since: 1997 1904
23rd Warmest Warmest since: 1998 2012
Ties: 1955
Nov 1998–Sep 1999
11-Month
53.4°F
(11.9°C)
51.3°F
(10.7°C)
2.1°F
(1.2°C)
112th Coolest Coolest since: 1997 1904
14th Warmest Warmest since: 1998 2012
Ties: 2006
Oct 1998–Sep 1999
12-Month
53.7°F
(12.1°C)
51.6°F
(10.9°C)
2.1°F
(1.2°C)
113th Coolest Coolest since: 1997 1904
13th Warmest Warmest since: 1998 2012
Apr 1998–Sep 1999
18-Month
58.7°F
(14.8°C)
56.6°F
(13.7°C)
2.1°F
(1.1°C)
120th Coolest Coolest since: 1998 1904, 1918
6th Warmest Warmest since: 1932 2012
Ties: 2006
Oct 1997–Sep 1999
24-Month
54.0°F
(12.2°C)
51.7°F
(10.9°C)
2.3°F
(1.3°C)
121st Coolest Coolest since: 1998 1979
4th Warmest Warmest to Date 2017
Ties: 2018
Oct 1996–Sep 1999
36-Month
52.8°F
(11.6°C)
51.6°F
(10.9°C)
1.2°F
(0.7°C)
104th Coolest Coolest since: 1998 1979
20th Warmest Warmest since: 1992 2018
Ties: 1921, 1992
Oct 1995–Sep 1999
48-Month
52.1°F
(11.2°C)
51.6°F
(10.9°C)
0.5°F
(0.3°C)
81st Coolest Coolest since: 1998 1905
42nd Warmest Warmest since: 1993 2019
Ties: 1987
Oct 1994–Sep 1999
60-Month
52.3°F
(11.3°C)
51.5°F
(10.8°C)
0.8°F
(0.5°C)
87th Coolest Coolest since: 1998 1906
35th Warmest Warmest since: 1992 2020
Ties: 1958, 1989, 2011

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published September 2021, retrieved on September 25, 2021 from https://www.ncdc.noaa.gov/cag/