Shae Cohan photographed these sprites on August 26. Sprites are electrical discharges that occur above thunderstorms, typically at an altitude of 30 to 55 miles. The picture was taken from Macomb, although the storms in question were southeast of Springfield near Taylorville. (click image to enlarge)
In the meteorological community, summer is considered to be the months of June, July, and August. The summer of 1936 finished with an average temperature of 81.0 degrees in Springfield, the warmest summer on record. During the month of August alone, 11 days had temperatures which still serve as record highs for the city. August 1936 saw an average high temperature of 94.1 degrees
August 1947 was a hot month in central Illinois. Springfield's average high temperature during the month was a scorching 94.9 degrees.