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News reports from 1995 made reference to a heat wave 40 years earlier: Temperatures in 1955 were higher than 1995 by a mere one-tenth of a degree. As many as 855 people died in 1955 because of the heat, the Tribune reported. The toll from 1995? More than 700 victims.
How hot were those years compared to normal?
In 1995, there were 29 days that topped 90 degrees from June 1 to Sept. 1, 39 days in 1955. By comparison, so far in 2015, there has been only one.
Twenty years ago the heat didn’t let up, in 1995 there were 79 days hotter than 80 degrees, more than 80 percent of the days between June 1 and Sept. 1. 1955 had 75 days hotter than 80.
The year 1988 had the most days over 90 degrees, with 44 (1955 ranked third and 1995 sixth). Since 1955, there have been only two summers with more than 40 days of 90 degrees or more. Most summers have 10 to 19 days, with the average summer measuring 15 days over 90 degrees.
Two days during the sweltering 1995 summer were hotter than 100 degrees. There were no days in 1955 over 100.
Read about how the 1995 heat wave changed Chicago’s emergency response
Summer temperatures compared with 1995 June 1 through Sept. 1
1955
Daily high, June 1 to Sept. 1
86: Average high temperature
39: Number of days over 90 degrees
1956
Daily high, June 1 to Sept. 1
83: Average high temperature
17: Number of days over 90 degrees
1957
Daily high, June 1 to Sept. 1
83: Average high temperature
19: Number of days over 90 degrees
1958
Daily high, June 1 to Sept. 1
80: Average high temperature
11: Number of days over 90 degrees
1959
Daily high, June 1 to Sept. 1
84: Average high temperature
23: Number of days over 90 degrees
1960
Daily high, June 1 to Sept. 1
80: Average high temperature
10: Number of days over 90 degrees
1961
Daily high, June 1 to Sept. 1
81: Average high temperature
9: Number of days over 90 degrees
1962
Daily high, June 1 to Sept. 1
81: Average high temperature
12: Number of days over 90 degrees
1963
Daily high, June 1 to Sept. 1
82: Average high temperature
10: Number of days over 90 degrees
1964
Daily high, June 1 to Sept. 1
82: Average high temperature
21: Number of days over 90 degrees
1965
Daily high, June 1 to Sept. 1
79: Average high temperature
5: Number of days over 90 degrees
1966
Daily high, June 1 to Sept. 1
83: Average high temperature
16: Number of days over 90 degrees
1967
Daily high, June 1 to Sept. 1
78: Average high temperature
2: Number of days over 90 degrees
1968
Daily high, June 1 to Sept. 1
82: Average high temperature
24: Number of days over 90 degrees
1969
Daily high, June 1 to Sept. 1
79: Average high temperature
6: Number of days over 90 degrees
1970
Daily high, June 1 to Sept. 1
81: Average high temperature
11: Number of days over 90 degrees
1971
Daily high, June 1 to Sept. 1
83: Average high temperature
18: Number of days over 90 degrees
1972
Daily high, June 1 to Sept. 1
80: Average high temperature
12: Number of days over 90 degrees
1973
Daily high, June 1 to Sept. 1
83: Average high temperature
11: Number of days over 90 degrees
1974
Daily high, June 1 to Sept. 1
79: Average high temperature
9: Number of days over 90 degrees
1975
Daily high, June 1 to Sept. 1
83: Average high temperature
20: Number of days over 90 degrees
1976
Daily high, June 1 to Sept. 1
83: Average high temperature
15: Number of days over 90 degrees
1977
Daily high, June 1 to Sept. 1
83: Average high temperature
22: Number of days over 90 degrees
1978
Daily high, June 1 to Sept. 1
81: Average high temperature
2: Number of days over 90 degrees
1979
Daily high, June 1 to Sept. 1
82: Average high temperature
13: Number of days over 90 degrees
1980
Daily high, June 1 to Sept. 1
83: Average high temperature
25: Number of days over 90 degrees
1981
Daily high, June 1 to Sept. 1
81: Average high temperature
6: Number of days over 90 degrees
1982
Daily high, June 1 to Sept. 1
79: Average high temperature
7: Number of days over 90 degrees
1983
Daily high, June 1 to Sept. 1
86: Average high temperature
36: Number of days over 90 degrees
1984
Daily high, June 1 to Sept. 1
83: Average high temperature
18: Number of days over 90 degrees
1985
Daily high, June 1 to Sept. 1
79: Average high temperature
8: Number of days over 90 degrees
1986
Daily high, June 1 to Sept. 1
81: Average high temperature
11: Number of days over 90 degrees
1987
Daily high, June 1 to Sept. 1
84: Average high temperature
33: Number of days over 90 degrees
1988
Daily high, June 1 to Sept. 1
87: Average high temperature
44: Number of days over 90 degrees
1989
Daily high, June 1 to Sept. 1
81: Average high temperature
8: Number of days over 90 degrees
1990
Daily high, June 1 to Sept. 1
81: Average high temperature
8: Number of days over 90 degrees
1991
Daily high, June 1 to Sept. 1
84: Average high temperature
23: Number of days over 90 degrees
1992
Daily high, June 1 to Sept. 1
78: Average high temperature
6: Number of days over 90 degrees
1993
Daily high, June 1 to Sept. 1
81: Average high temperature
11: Number of days over 90 degrees
1994
Daily high, June 1 to Sept. 1
81: Average high temperature
14: Number of days over 90 degrees
1995
Daily high, June 1 to Sept. 1
86: Average high temperature
29: Number of days over 90 degrees
1996
Daily high, June 1 to Sept. 1
80: Average high temperature
8: Number of days over 90 degrees
1997
Daily high, June 1 to Sept. 1
80: Average high temperature
13: Number of days over 90 degrees
1998
Daily high, June 1 to Sept. 1
82: Average high temperature
9: Number of days over 90 degrees
1999
Daily high, June 1 to Sept. 1
83: Average high temperature
18: Number of days over 90 degrees
2000
Daily high, June 1 to Sept. 1
80: Average high temperature
3: Number of days over 90 degrees
2001
Daily high, June 1 to Sept. 1
81: Average high temperature
18: Number of days over 90 degrees
2002
Daily high, June 1 to Sept. 1
84: Average high temperature
21: Number of days over 90 degrees
2003
Daily high, June 1 to Sept. 1
81: Average high temperature
10: Number of days over 90 degrees
2004
Daily high, June 1 to Sept. 1
78: Average high temperature
3: Number of days over 90 degrees
2005
Daily high, June 1 to Sept. 1
85: Average high temperature
22: Number of days over 90 degrees
2006
Daily high, June 1 to Sept. 1
82: Average high temperature
13: Number of days over 90 degrees
2007
Daily high, June 1 to Sept. 1
83: Average high temperature
16: Number of days over 90 degrees
2008
Daily high, June 1 to Sept. 1
82: Average high temperature
5: Number of days over 90 degrees
2009
Daily high, June 1 to Sept. 1
78: Average high temperature
4: Number of days over 90 degrees
2010
Daily high, June 1 to Sept. 1
84: Average high temperature
19: Number of days over 90 degrees
2011
Daily high, June 1 to Sept. 1
84: Average high temperature
20: Number of days over 90 degrees
2012
Daily high, June 1 to Sept. 1
87: Average high temperature
40: Number of days over 90 degrees
2013
Daily high, June 1 to Sept. 1
81: Average high temperature
9: Number of days over 90 degrees
2014
Daily high, June 1 to Sept. 1
81: Average high temperature
3: Number of days over 90 degrees
2015
Daily high, June 1 to July 14
77: Average high temperature
1: Number of days over 90 degrees
Note: 1955 to 1958 temperatures are measured at Midway, 1959 to present at O’Hare.
Source: Midwest Regional Climate Center
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