From NWS
1971: Unseasonably cool air settled across Iowa on the morning of July 30th with every station in the state dropping below 50 degrees and a few locations in the southwest reaching the upper 30s. At Des Moines the low of 47 F established an all-time July record for that location. The lowest reported temperatures included 39 F at Atlantic and Red Oak and 36 F at Oakland.

30 July 1997 → Two waterspouts moved onshore in northern Virginia Beach, VA. One tracked into Norfolk. 30 July 1999 → At nine o’clock in the morning Chicago recorded its highest ever dew point temperature of 82 degrees. The temperature at the time was 88, resulting in a heat index of 108. The dew point is an indication of the amount of moisture in the air.

Posted under Weather History