This past summer had the fewest 100ºF readings of any summer in at least a century in the US.
Summers used to be much hotter in the US, and over the last century, 100ºF readings have dropped by 25%. The summer of 1936 had more than seven times as many 100ºF readings as 2013.
According to NOAA, 2012 was the most extreme year in US history – yet their data shows that it didn’t even rank in the top twenty for hot days. They consider mild winter days to be extreme, and then count each mild winter day as two extreme temperatures (minimum and maximum.)
In 1907, the US Weather Bureau explained NOAA’s actions :
JANUARY, 1907. MONTHLY WEATHER REVIEW.
It is wrong to mutilate or suppress the record of an observation of a phenomenon of nature, but it is also wrong to make a bad use of the record. In fact, it is the misuse of meteorological data, not the observing or publishing, that constitutes a crime against the community.