As feared, last month was the wettest June on record in Illinois, and the second-wettest month of all time:
The statewide average precipitation for June 2015 in Illinois was 242.1 mm, based on available data through June 30. That is 135.4 mm above the average June precipitation, and the wettest June on record for Illinois.
In addition to being the wettest June on record, it is the second wettest month on record for Illinois. Only September 1926 was wetter at 244.4 mm – just 2.3 mm higher.
Meanwhile, in Chicago, it was the cloudiest June in all 122 years of records, in part because we're covered in Canadian wildfire smoke making everything a little hazy.
On the other hand, it got up to 35°C in London today—and they don't generally have air conditioning over there. Yow.