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 1998

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
August 1998
1-Month 		76.7°F
(24.8°C)		 76.0°F
(24.4°C)		 0.7°F
(0.4°C)		 81st Coolest
Coolest since:
 1915
48th Warmest
Warmest since:
 1936
Jul–Aug 1998
2-Month 		77.4°F
(25.2°C)		 77.0°F
(25.0°C)		 0.4°F
(0.2°C)		 82nd Coolest
Coolest since:
 1967
47th Warmest
Warmest since:
 1936
Ties: 1919, 1923, 1933, 2018
Jun–Aug 1998
3-Month 		76.7°F
(24.8°C)		 76.0°F
(24.4°C)		 0.7°F
(0.4°C)		 90th Coolest
Coolest since:
 1915, 1927
39th Warmest
Warmest since:
 1936
Ties: 1900, 1909, 1922, 1937
May–Aug 1998
4-Month 		75.0°F
(23.9°C)		 73.2°F
(22.9°C)		 1.8°F
(1.0°C)		 110th Coolest
Coolest since:
 1967
19th Warmest
Warmest since:
 1936
Ties: 1944, 1954
Apr–Aug 1998
5-Month 		71.1°F
(21.7°C)		 69.6°F
(20.9°C)		 1.5°F
(0.8°C)		 104th Coolest
Coolest since:
 1907
25th Warmest
Warmest since:
 2010
Ties: 1921, 1953, 1986, 2005, 2018
Mar–Aug 1998
6-Month 		66.7°F
(19.3°C)		 65.5°F
(18.6°C)		 1.2°F
(0.7°C)		 102nd Coolest
Coolest since:
 1904
27th Warmest
Warmest since:
 2012
Ties: 1922, 1988
Feb–Aug 1998
7-Month 		63.3°F
(17.4°C)		 61.1°F
(16.2°C)		 2.2°F
(1.2°C)		 116th Coolest
Coolest since:
 1904
13th Warmest
Warmest since:
 2012
Ties: 1925, 1953
Jan–Aug 1998
8-Month 		60.0°F
(15.6°C)		 57.3°F
(14.1°C)		 2.7°F
(1.5°C)		 122nd Coolest
Coolest since:
 1912
7th Warmest
Warmest since:
 2012
Dec 1997–Aug 1998
9-Month 		57.3°F
(14.1°C)		 54.8°F
(12.7°C)		 2.5°F
(1.4°C)		 121st Coolest
Coolest since:
 1904
7th Warmest
Warmest since:
 2012
Ties: 1953, 2007
Nov 1997–Aug 1998
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, 1999
Oct 1997–Aug 1998
11-Month 		55.9°F
(13.3°C)		 54.1°F
(12.3°C)		 1.8°F
(1.0°C)		 113th Coolest
Coolest since:
 1904
15th Warmest
Warmest since:
 2012
Ties: 1934
Sep 1997–Aug 1998
12-Month 		57.0°F
(13.9°C)		 55.4°F
(13.0°C)		 1.6°F
(0.9°C)		 113th Coolest
Coolest since:
 1904
15th Warmest
Warmest since:
 2012
Ties: 1987
Mar 1997–Aug 1998
18-Month 		59.3°F
(15.2°C)		 58.7°F
(14.8°C)		 0.6°F
(0.4°C)		 84th Coolest
Coolest since:
 1904
44th Warmest
Warmest since:
 2012
Ties: 1901, 1938, 1943, 1956
Sep 1996–Aug 1998
24-Month 		55.6°F
(13.1°C)		 55.4°F
(13.0°C)		 0.2°F
(0.1°C)		 76th Coolest
Coolest since:
 1979
51st Warmest
Warmest since:
 2017
Ties: 1936, 1944, 1965, 1975, 2009
Sep 1995–Aug 1998
36-Month 		55.1°F
(12.8°C)		 55.3°F
(12.9°C)		 -0.2°F
(-0.1°C)		 39th Coolest
Coolest since:
 1979
87th Warmest
Warmest since:
 2018
Ties: 1903, 1967, 1985, 1994
Sep 1994–Aug 1998
48-Month 		55.5°F
(13.1°C)		 55.3°F
(12.9°C)		 0.2°F
(0.2°C)		 60th Coolest
Coolest since:
 1980
65th Warmest
Warmest since:
 2019
Ties: 1911, 1948, 1995
Sep 1993–Aug 1998
60-Month 		55.3°F
(12.9°C)		 55.4°F
(13.0°C)		 -0.1°F
(-0.1°C)		 53rd Coolest
Coolest since:
 1906
71st Warmest
Warmest since:
 2020
Ties: 1917, 1952

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