The results are in for meteorologcial summer 2016, and it was, in fact, really warm and soggy in Illinois. Chicago's average temperature of 23.5°C was 1.4°C above the 1980-2010 normal. That period was the warmest in history, however, so the summer that just ended Wednesday was Chicago's 18th warmest in recorded history, putting it at the 88th percentile.
Did I mention wet? For June through August, we got 338.8 mm of precipitation, a damp 32.8 mm above normal—not a record, but still very squishy.
Oh, wait—we did hit a record after all. Illinois' statewide average 175.0 mm of precipitation in August, and 349.0 mm for July and August combined, were both the wettest such periods in recorded Illinois history.
Combine the humidity that produced all that precipitation with the above-normal heat and this past summer was uncomfortable.
September, however, has been delightful. The Tribune reports that yesterday Chicago had 100% of its possible sunshine for the first time since June 21st, and we may have an entire weekend—3 days in a row—for the first time since November 10th.