Climate at a Glance

Divisional 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 March 2021. For more information, please see Climatological Rankings.


Illinois, Climate Division 8. Southwest

Average Temperature Rankings, May 1999

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2020)
Warmest/Coolest
Since
Record
May 1999
1-Month
65.7°F
(18.7°C)
65.1°F
(18.4°C)
0.6°F
(0.3°C)
66th Coolest Coolest since: 1997 1917, 1924
61st Warmest Warmest since: 1998 2018
Ties: 1974
Apr–May 1999
2-Month
62.2°F
(16.8°C)
60.2°F
(15.7°C)
2.0°F
(1.1°C)
102nd Coolest Coolest since: 1997 1907
25th Warmest Warmest since: 1998 1896
Ties: 1906, 1934, 2019
Mar–May 1999
3-Month
55.4°F
(13.0°C)
55.0°F
(12.8°C)
0.4°F
(0.2°C)
66th Coolest Coolest since: 1997 1960
61st Warmest Warmest since: 1998 2012
Feb–May 1999
4-Month
52.2°F
(11.2°C)
50.0°F
(10.0°C)
2.2°F
(1.2°C)
108th Coolest Coolest since: 1997 1978
19th Warmest Warmest since: 1998 2012
Ties: 1954, 1955, 1974
Jan–May 1999
5-Month
48.3°F
(9.1°C)
46.2°F
(7.9°C)
2.1°F
(1.2°C)
102nd Coolest Coolest since: 1997 1978
25th Warmest Warmest since: 1998 2012
Ties: 1954
Dec 1998–May 1999
6-Month
46.6°F
(8.1°C)
44.3°F
(6.8°C)
2.3°F
(1.3°C)
111th Coolest Coolest since: 1997 1978
15th Warmest Warmest since: 1998 2012
Ties: 1987
Nov 1998–May 1999
7-Month
46.9°F
(8.3°C)
44.3°F
(6.8°C)
2.6°F
(1.5°C)
114th Coolest Coolest since: 1998 1978
12th Warmest Warmest since: 1998 2012
Ties: 1998
Oct 1998–May 1999
8-Month
48.5°F
(9.2°C)
45.9°F
(7.7°C)
2.6°F
(1.5°C)
117th Coolest Coolest since: 1998 1978
9th Warmest Warmest since: 1991 2012
Sep 1998–May 1999
9-Month
51.3°F
(10.7°C)
48.5°F
(9.2°C)
2.8°F
(1.5°C)
119th Coolest Coolest since: 1998 1978
7th Warmest Warmest since: 1932 2012
Ties: 2006
Aug 1998–May 1999
10-Month
53.9°F
(12.2°C)
51.3°F
(10.7°C)
2.6°F
(1.5°C)
119th Coolest Coolest since: 1998 1978
7th Warmest Warmest since: 1932 2012
Jul 1998–May 1999
11-Month
56.1°F
(13.4°C)
53.7°F
(12.1°C)
2.4°F
(1.3°C)
119th Coolest Coolest since: 1998 1918
7th Warmest Warmest since: 1932 2012
Jun 1998–May 1999
12-Month
57.7°F
(14.3°C)
55.4°F
(13.0°C)
2.3°F
(1.3°C)
119th Coolest Coolest since: 1998 1904, 1918
7th Warmest Warmest since: 1955 2012
Ties: 1955
Dec 1997–May 1999
18-Month
54.3°F
(12.4°C)
51.6°F
(10.9°C)
2.7°F
(1.5°C)
121st Coolest Coolest since: 1998 1979
4th Warmest Warmest to Date 2017
Jun 1997–May 1999
24-Month
57.1°F
(13.9°C)
55.4°F
(13.0°C)
1.7°F
(0.9°C)
115th Coolest Coolest since: 1998 1905, 1978
10th Warmest Warmest since: 1992 2017
Ties: 1954, 1992, 2006
Jun 1996–May 1999
36-Month
56.2°F
(13.4°C)
55.4°F
(13.0°C)
0.8°F
(0.4°C)
98th Coolest Coolest since: 1998 1979
26th Warmest Warmest since: 1992 2018
Ties: 1922, 1943, 1974, 2005, 2009
Jun 1995–May 1999
48-Month
55.8°F
(13.2°C)
55.4°F
(13.0°C)
0.4°F
(0.2°C)
76th Coolest Coolest since: 1998 1980
47th Warmest Warmest since: 1993 2019
Ties: 1925, 1974, 2016
Jun 1994–May 1999
60-Month
55.9°F
(13.3°C)
55.4°F
(13.0°C)
0.5°F
(0.3°C)
82nd Coolest Coolest since: 1998 1979, 1980, 1981
40th Warmest Warmest since: 1992 2020
Ties: 1945, 1946, 1989, 1990

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Divisional Time Series, published April 2021, retrieved on April 20, 2021 from https://www.ncdc.noaa.gov/cag/