On this date in 1944, almost half of the US was over 90 degrees, and Saluda, South Carolina was 103 degrees.
May 15 temperatures at Saluda have declined sharply since the peak in the 1940’s.
Chambersburg, Pennsylvania was 98 degrees on May 15, 1944 – compared to 56 degrees last year (NASA’s hottest year ever.) It has been 55 years since Chambersburg reached 90 degrees on May 15.
The percentage of USHCN stations over 90 degrees on May 15 has been declining for over a century, with the three hottest years being 1944, 1900 and 1915. The last two years have been among the coolest.
If we had a hot day like that now on May 15, climate experts would state 99% certainty that it was due to man-made CO2.
