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, August 1999

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
August 1999
1-Month		74.8°F
(23.8°C)		76.0°F
(24.4°C)		-1.2°F
(-0.6°C)		34th Coolest
Coolest since:
1915
95th Warmest
Warmest since:
1936
Ties: 1902, 1911, 1939, 1963, 1965
Jul–Aug 1999
2-Month		77.6°F
(25.3°C)		77.0°F
(25.0°C)		0.6°F
(0.3°C)		87th Coolest
Coolest since:
1967
42nd Warmest
Warmest since:
1936
Ties: 1977, 1991, 2019
Jun–Aug 1999
3-Month		76.5°F
(24.7°C)		75.9°F
(24.4°C)		0.6°F
(0.3°C)		83rd Coolest
Coolest since:
1915, 1927
46th Warmest
Warmest since:
1936
Ties: 1899, 1947, 1977, 1986
May–Aug 1999
4-Month		73.8°F
(23.2°C)		73.2°F
(22.9°C)		0.6°F
(0.3°C)		75th Coolest
Coolest since:
1967
54th Warmest
Warmest since:
1936
Ties: 1926
Apr–Aug 1999
5-Month		70.8°F
(21.6°C)		69.6°F
(20.9°C)		1.2°F
(0.7°C)		93rd Coolest
Coolest since:
1907
36th Warmest
Warmest since:
2010
Ties: 1925, 1943, 1944, 2015
Mar–Aug 1999
6-Month		66.0°F
(18.9°C)		65.5°F
(18.6°C)		0.5°F
(0.3°C)		78th Coolest
Coolest since:
1904
51st Warmest
Warmest since:
2012
Ties: 1980, 2004
Feb–Aug 1999
7-Month		62.6°F
(17.0°C)		61.1°F
(16.2°C)		1.5°F
(0.8°C)		105th Coolest
Coolest since:
1904
24th Warmest
Warmest since:
2012
Ties: 1932, 1936, 2018
Jan–Aug 1999
8-Month		58.9°F
(14.9°C)		57.3°F
(14.1°C)		1.6°F
(0.8°C)		102nd Coolest
Coolest since:
1912
27th Warmest
Warmest since:
2012
Dec 1998–Aug 1999
9-Month		56.6°F
(13.7°C)		54.8°F
(12.7°C)		1.8°F
(1.0°C)		107th Coolest
Coolest since:
1904
21st Warmest
Warmest since:
2012
Nov 1998–Aug 1999
10-Month		55.8°F
(13.2°C)		53.8°F
(12.1°C)		2.0°F
(1.1°C)		114th Coolest
Coolest since:
1904
14th Warmest
Warmest since:
2012
Ties: 1934, 1998
Oct 1998–Aug 1999
11-Month		56.2°F
(13.4°C)		54.1°F
(12.3°C)		2.1°F
(1.1°C)		116th Coolest
Coolest since:
1904
12th Warmest
Warmest since:
2012
Ties: 2022
Sep 1998–Aug 1999
12-Month		57.6°F
(14.2°C)		55.4°F
(13.0°C)		2.2°F
(1.2°C)		119th Coolest
Coolest since:
1904
9th Warmest
Warmest since:
2012
Ties: 1934, 1991
Mar 1998–Aug 1999
18-Month		60.7°F
(15.9°C)		58.7°F
(14.8°C)		2.0°F
(1.1°C)		122nd Coolest
Coolest since:
1904
6th Warmest
Warmest since:
2012
Ties: 2006, 2011
Sep 1997–Aug 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
Ties: 1922, 1955, 2007
Sep 1996–Aug 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: 2014
Sep 1995–Aug 1999
48-Month		55.8°F
(13.2°C)		55.3°F
(12.9°C)		0.5°F
(0.3°C)		81st Coolest
Coolest since:
1980
44th Warmest
Warmest since:
2019
Ties: 1938, 1943, 1974, 1975, 1990, 2004
Sep 1994–Aug 1999
60-Month		55.9°F
(13.3°C)		55.3°F
(12.9°C)		0.6°F
(0.4°C)		82nd Coolest
Coolest since:
1906
42nd Warmest
Warmest since:
2020
Ties: 1941, 1945, 1954, 1989, 1990, 1995

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