Days with Identical Highs and Lows

Dear Tom,
Has Chicago ever had exactly the same high and low temperatures on
consecutive days, or even three days in a row?
Ed Kozak, Burbank, Ill.
Dear Ed,
Chicago's weather is in flux almost all the time. Occasionally, though, when
weather systems are hardly moving, with a little luck the city can register
identical high and low temperatures on two consecutive days.
A computer scan of 137 years of Chicago temperatures (1871-2007, a period
encompassing 50,038 days) reveals that 287 pairs of days logged identical
highs and lows -- an average of two such occurrences per year; most recently
Aug. 26-27, 2007, with highs/lows of 79/60 degrees.
Three days in a row? Exceedingly rare: only four events; Aug. 11-13, 1879
(82/65); Aug. 26-28, 1882 (74/70); Sept. 5-7, 1910 (81/68); and Nov. 22-24,
1920 (42/37). It has never occurred four days in a row.