12th warmest June suggests a hot summer

Chicago weather historian Frank Wachowski informs us that June has been warm, with an average temperature, as of the 27th, of 73.4º. That ranks 12th warmest in 80 years (1928-2007) of temperature records at Midway Airport.
We identified 16 years with comparable average temperatures through the 27th, then tallied the 90° occurrences in those years. Those 16 years produced an average of 32 days per year at or above 90º, versus the long-term average of 24 days—a strong suggestion that the above-normal trend of temperatures thus far this summer is likely to persist in July and August. In contrast, pleasantly cool and refreshingly dry air is forecast to dominate area weather through the next few days, but computer models suggest a turn to higher temps and increasing humidity by early next week.
-By Tom Skilling, WGN-TV Chief Meteorologist