Why isn’t the hottest weather on the year’s longest day?

More summer solstice-related science from Deborah Byrd at EarthSky.org:

The longest day of the year comes at the summer solstice, but the hottest weather always follows a month or two later. With the past decade the warmest on record, the hot weather nowadays can be very hot indeed – as we in Texas can testify.

The phenomenon of the hot weather following the summer solstice by a month or two is called the lag of the seasons. Why does it happen?


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