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 2020. For more information, please see Climatological Rankings.


Illinois

Average Temperature Rankings, September 1999

View Period (Months):All1234567891011121824364860
Download: xml csv json
  • Record Coolest
  • Bottom 1/10
  • Bottom 1/3
  • Normal
  • Top 1/3
  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2019)
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
85th 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
99th 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
58th 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
56th 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)
82nd 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)
87th 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)
84th 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)
108th 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
30th 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
22nd 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)
111th 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)
112th 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)
119th 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)
120th 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)
103rd 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
41st 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
34th Warmest Warmest since: 1992 2002
Ties: 1958, 1989, 2011

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published September 2020, retrieved on September 24, 2020 from https://www.ncdc.noaa.gov/cag/