Today was the 12th consecutive day with a high of 85+ at ORD.
Some of these non-round number streaks can start to get silly, but the 85+ one has some significance because it's basically the cutoff of what the highest average high temp is in Chicago.
Other top 85+ degree streaks below. All of them occurred after the official observation site moved inland (first to Midway and then O'Hare).
This year's streak should end up high on the list.
#of days, ending date
21, 7/9/1949
16, 7/23/1983
15, 7/22/2005
15, 7/13/1966
14, 8/9/1988
14, 8/8/1983
14, 7/11/1955
14, 6/22/1954
13, 7/9/2012
13, 6/25/1995
13, 5/25/1977 (impressively early one)
13, 6/21/1956
13, 9/3/1953
13, 8/14/1947
12, 7/2/1964
12, 8/30/1959
12, 8/5/1955