The contiguous United States just experienced its warmest summer on record, according to data released Wednesday by the National Oceanic and Atmospheric Administration, with sweltering conditions driven by nights — particularly in the West — that would not cool.
The average temperature from June through August was 74.4 degrees Fahrenheit across the Lower 48 and the District of Columbia, surpassing by 0.4 degrees the
previous record set during a notoriously sweltering Dust Bowl summer of 1936. The records date to 1895.