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 8. Southwest

Average Temperature Rankings, July 1999

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
July 1999
1-Month 		80.4°F
(26.9°C)		 77.9°F
(25.5°C)		 2.5°F
(1.4°C)		 111th Coolest
Coolest since:
 2014
18th Warmest
Warmest since:
 2012
Ties: 1931
Jun–Jul 1999
2-Month 		77.4°F
(25.2°C)		 75.9°F
(24.4°C)		 1.5°F
(0.8°C)		 99th Coolest
Coolest since:
 1904, 1927
30th Warmest
Warmest since:
 1934
Ties: 1991
May–Jul 1999
3-Month 		73.5°F
(23.1°C)		 72.3°F
(22.4°C)		 1.2°F
(0.7°C)		 94th Coolest
Coolest since:
 1924
35th Warmest
Warmest since:
 1934
Ties: 1918, 1943, 2007
Apr–Jul 1999
4-Month 		69.8°F
(21.0°C)		 68.1°F
(20.1°C)		 1.7°F
(0.9°C)		 106th Coolest
Coolest since:
 1907
23rd Warmest
Warmest since:
 2012
Ties: 1932, 2016, 2018
Mar–Jul 1999
5-Month 		64.2°F
(17.9°C)		 63.4°F
(17.4°C)		 0.8°F
(0.5°C)		 86th Coolest
Coolest since:
 1960
43rd Warmest
Warmest since:
 2012
Ties: 1908
Feb–Jul 1999
6-Month 		60.6°F
(15.9°C)		 58.6°F
(14.8°C)		 2.0°F
(1.1°C)		 111th Coolest
Coolest since:
 1947
18th Warmest
Warmest since:
 2012
Ties: 1952, 2000
Jan–Jul 1999
7-Month 		56.6°F
(13.7°C)		 54.7°F
(12.6°C)		 1.9°F
(1.1°C)		 107th Coolest
Coolest since:
 1912
22nd Warmest
Warmest since:
 2012
Ties: 1934, 2020
Dec 1998–Jul 1999
8-Month 		54.3°F
(12.4°C)		 52.2°F
(11.2°C)		 2.1°F
(1.2°C)		 111th Coolest
Coolest since:
 1978
17th Warmest
Warmest since:
 2012
Ties: 1987
Nov 1998–Jul 1999
9-Month 		53.7°F
(12.1°C)		 51.3°F
(10.7°C)		 2.4°F
(1.4°C)		 117th Coolest
Coolest since:
 1904, 1912
11th Warmest
Warmest since:
 2012
Oct 1998–Jul 1999
10-Month 		54.3°F
(12.4°C)		 52.0°F
(11.1°C)		 2.3°F
(1.3°C)		 120th Coolest
Coolest since:
 1904, 1912
8th Warmest
Warmest since:
 2012
Ties: 2002, 2006
Sep 1998–Jul 1999
11-Month 		56.1°F
(13.4°C)		 53.5°F
(11.9°C)		 2.6°F
(1.5°C)		 122nd Coolest
Coolest since:
 1904
6th Warmest
Warmest since:
 2012
Aug 1998–Jul 1999
12-Month 		57.8°F
(14.3°C)		 55.4°F
(13.0°C)		 2.4°F
(1.3°C)		 122nd Coolest
Coolest since:
 1904
6th Warmest
Warmest since:
 2012
Ties: 1921
Feb 1998–Jul 1999
18-Month 		58.9°F
(14.9°C)		 56.5°F
(13.6°C)		 2.4°F
(1.3°C)		 124th Coolest
Coolest since:
 1918, 1979
4th Warmest
Warmest since:
 2012
Aug 1997–Jul 1999
24-Month 		57.3°F
(14.1°C)		 55.4°F
(13.0°C)		 1.9°F
(1.1°C)		 118th Coolest
Coolest since:
 1979
9th Warmest
Warmest since:
 2017
Aug 1996–Jul 1999
36-Month 		56.3°F
(13.5°C)		 55.4°F
(13.0°C)		 0.9°F
(0.5°C)		 100th Coolest
Coolest since:
 1979
26th Warmest
Warmest since:
 2018
Ties: 1943, 1957, 1988, 2004
Aug 1995–Jul 1999
48-Month 		55.9°F
(13.3°C)		 55.3°F
(12.9°C)		 0.6°F
(0.4°C)		 81st Coolest
Coolest since:
 1980
44th Warmest
Warmest since:
 2019
Ties: 1940, 1954
Aug 1994–Jul 1999
60-Month 		55.9°F
(13.3°C)		 55.3°F
(12.9°C)		 0.6°F
(0.4°C)		 81st Coolest
Coolest since:
 1906
43rd Warmest
Warmest since:
 2020
Ties: 1945, 1946, 1989, 1990

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