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These places seem odd in not only having diurnal ranges in winter greater than those climates further north than them on the east coast, but even compared to those more arid than them too. It seems these cities on the supposedly humid "east" can have diurnal ranges closer to western climates.
Florida, though having a distinct dry season, is still not arid or anything, so how can it have diurnal ranges equivalent to that of Denver or Phoenix?
Soil Type. Wind. Solar heating during the day. Cloud cover. Humid areas. Elevation all play a role. Have to see what is influenced at the locations you mentioned. Each location will have their reasoning.
For Northern Florida I will assume latitude plays a role with the sun being warmer and because of the SouthEast ridge which pumps south winds during the day, then as the sun goes down the heat radiates back to space and the air cools off with the heat source not in the sky.
I think greater deviation in winter minimums would be the main reason.
Do those places have climates in which the typical winter day has a diurnal range close close to the monthly averages? Or does it have large deviations from the average minimum?
Where I live, the diurnal range is nearly 12C/24F, yet it's rare for winter minimums to be more than 5C/10F colder than the average minimum (maybe once a winter) I'm guessing those cities see much greater deviation than that?
That's amazing. Diurnal range should be twice as high in the summer than the winter, not the other way around (at least that's the way it is here... no wait, it's triple in the summer).
The East Coast and the South aren't very subtropical. And there is a thread about that.
The eastern half of the US is very continental influenced. It won't be that warm - Even Miami has gotten that cold...
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