This post by The Chiefio correlates with my gut feel for the data.
Summers aren’t getting hotter except due to UHI.
Winters are less cold. According to Chiefio it is because high altitude thermometers are disappearing. I just believe in waste heat produced by billions of humans.
Here are the highlights:
Basically I [The Chiefio] found that for some Continents (regions) the Winter Data is vastly more volatile than the Summer data. Most (all?) of the “warming” comes out of a reduction of the volatility to the downside of those cool season data. Hot seasons are just not very volatile. Yet they DO have an up tilt at the very end with the advent of electronic thermometers and lots more asphalt around airports.
My conclusion (up here at the top 😉 is that this leans strongly toward “hot black asphalt in the sun” causing the summer “lift” and “loss of…
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