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.@BjornLomborg asked about heat waves instead of just the raw number of hot days.
Here's the times series of occurrence heat waves warmer than the 95th percentile of heat waves for heat waves of 2-5 days (where the temperature of a heat wave is the minimum daily temperature).pic.twitter.com/cce8JhwcOu
You're making up your own heatwave measure of *minimum* temps
EPA and US Fourth National Climate Assessment *both* insist heatwaves or warm spells — of course — are max of max, and peaked in 1930s
Using EPA and CSSR
Dessler-index of min temps, 
pick
https://science2017.globalchange.gov/chapter/6/ pic.twitter.com/I2LST9wBXW
Sorry, it's hard to explain methodology in 280 characters. For every x-day period (x=2-5 days) I took the lowest Tmax during that period as the temperature of the heat wave. I also took the average Tmax as the temperature of the heat wave. Then I took ...
the 95th percentile of the heat wave temps and used that as the threshold. Then I plotted the occurrence of heat waves with higher temps as a function of time.
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