== Using Midway Data for Chicago climate?  == 
 O'Hare is the official recording site for Chicago weather data, and was for the entire period from 1981-2010, so it appears inappropriate to use the data from midway as examples of the records and averages for Chicago.  Midway is no more representative than the lakefront is, or O'Hare for that matter, but O'Hare is the official site, and should be the source for stats of this sort.