On July 21 1901, seventy-seven percent of the US was over 90F, thirty-six percent was over 100F, and two percent was over 110F
In the map below, orange states were over 90F, red states were over 100F, and pink states were over 110F on July 21, 1901. (California and Nevada were likely over 100F too, but there are no records in the USHCN database for that day.)
CO2 was below 300 PPM, and Hansen says that heatwaves were impossible at that time.
We conclude that extreme heat waves, such as that in Texas and Oklahoma in 2011 and Moscow in 2010, were “caused” by global warming, because their likelihood was negligible prior to the recent rapid global warming.
– James Hansen (world’s best climate scientist)
People who lived at the time probably would have said that Hansen has no idea what he is talking about.
This heatwave was extremely inconvenient for climate alarmists, so NCDC/USHCN has tried to eliminate it by subtracting an amazing 2.5 degrees from reported July, 1901 temperatures. The graph below shows the difference between NCDC reported temperatures and raw USHCN temperatures.