The likelihood of hot weather on May 31 has plummeted in the US over the past century.
On the last day of May, 1934 100 degree temperatures covered the Great Plains and Midwest. Fayette, Iowa was 109 degrees. Temperatures that hot in Iowa are inconceivable now in July, much less in May.
1934 was the warmest year on record in the US, and NOAA compensates for the heat by simply erasing it.
