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, April 1998

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
April 1998
1-Month		55.4°F
(13.0°C)		55.3°F
(12.9°C)		0.1°F
(0.1°C)		61st Coolest
Coolest since:
1907
68th Warmest
Warmest since:
1896
Ties: 1905, 1908, 1931
Mar–Apr 1998
2-Month		50.0°F
(10.0°C)		50.0°F
(10.0°C)		0.0°F
(0.0°C)		63rd Coolest
Coolest since:
1960
66th Warmest
Warmest since:
2012
Ties: 1939
Feb–Apr 1998
3-Month		47.6°F
(8.7°C)		44.9°F
(7.2°C)		2.7°F
(1.5°C)		106th Coolest
Coolest since:
1899
23rd Warmest
Warmest since:
2012
Jan–Apr 1998
4-Month		45.0°F
(7.2°C)		41.5°F
(5.3°C)		3.5°F
(1.9°C)		115th Coolest
Coolest since:
1978
14th Warmest
Warmest since:
2012
Dec 1997–Apr 1998
5-Month		43.1°F
(6.2°C)		40.1°F
(4.5°C)		3.0°F
(1.7°C)		114th Coolest
Coolest since:
1978
14th Warmest
Warmest since:
2012
Ties: 1919, 2002
Nov 1997–Apr 1998
6-Month		43.0°F
(6.1°C)		40.9°F
(4.9°C)		2.1°F
(1.2°C)		107th Coolest
Coolest since:
1912
21st Warmest
Warmest since:
2012
Ties: 1925
Oct 1997–Apr 1998
7-Month		45.0°F
(7.2°C)		43.2°F
(6.2°C)		1.8°F
(1.0°C)		103rd Coolest
Coolest since:
1899, 1978
25th Warmest
Warmest since:
2012
Sep 1997–Apr 1998
8-Month		48.0°F
(8.9°C)		46.5°F
(8.1°C)		1.5°F
(0.8°C)		104th Coolest
Coolest since:
1918
24th Warmest
Warmest since:
2017
Ties: 1925, 2004
Aug 1997–Apr 1998
9-Month		50.9°F
(10.5°C)		49.8°F
(9.9°C)		1.1°F
(0.6°C)		97th Coolest
Coolest since:
1918
31st Warmest
Warmest since:
2017
Ties: 1948, 1995
Jul 1997–Apr 1998
10-Month		53.6°F
(12.0°C)		52.6°F
(11.4°C)		1.0°F
(0.6°C)		95th Coolest
Coolest since:
1918
33rd Warmest
Warmest since:
2012
Ties: 1898, 2007
Jun 1997–Apr 1998
11-Month		55.2°F
(12.9°C)		54.5°F
(12.5°C)		0.7°F
(0.4°C)		83rd Coolest
Coolest since:
1918
45th Warmest
Warmest since:
2012, 2017
May 1997–Apr 1998
12-Month		55.7°F
(13.2°C)		55.4°F
(13.0°C)		0.3°F
(0.2°C)		72nd Coolest
Coolest since:
1918
56th Warmest
Warmest since:
2012, 2017
Ties: 1966
Nov 1996–Apr 1998
18-Month		50.6°F
(10.3°C)		50.5°F
(10.3°C)		0.1°F
(0.0°C)		58th Coolest
Coolest since:
1905, 1979
69th Warmest
Warmest since:
2017
Ties: 1925, 1926, 1948, 2009
May 1996–Apr 1998
24-Month		55.3°F
(12.9°C)		55.4°F
(13.0°C)		-0.1°F
(-0.1°C)		46th Coolest
Coolest since:
1978
81st Warmest
Warmest since:
2017
Ties: 1928, 1944, 1948, 1958, 1964, 2010, 2014
May 1995–Apr 1998
36-Month		55.0°F
(12.8°C)		55.4°F
(13.0°C)		-0.4°F
(-0.2°C)		33rd Coolest
Coolest since:
1979
93rd Warmest
Warmest since:
2018
Ties: 1908, 1914, 1928, 1953, 1995, 2015
May 1994–Apr 1998
48-Month		55.3°F
(12.9°C)		55.3°F
(12.9°C)		0.0°F
(0.0°C)		49th Coolest
Coolest since:
1980
76th Warmest
Warmest since:
2019
Ties: 1903, 1909, 1915, 1926, 1953, 1986
May 1993–Apr 1998
60-Month		55.2°F
(12.9°C)		55.3°F
(12.9°C)		-0.1°F
(0.0°C)		47th Coolest
Coolest since:
1980, 1981
77th Warmest
Warmest since:
2020
Ties: 1916, 1931, 1985

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