Why are cities often hotter than the surrounding countryside?

Ever noticed that the temperature in downtown Austin is often higher than in more rural places just outside the city? There's a reason for it: the urban heat island effect.
Summary by The Austin Editorial Desk · Byline on the source page: Christopher Adams, as published by KXAN Local · · 1 min read

Ever noticed that the temperature in downtown Austin is often higher than in more rural places just outside the city? There's a reason for it: the urban heat island effect.
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