thermal belt

thermal belt

[′thər·məl ‚belt]
(ecology)
Any one of several possible horizontal belts of a vegetation type found in mountainous terrain, resulting primarily from vertical temperature variation. Also known as thermal zone.
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Another thing, Trillium Covert and Madrono Ranch were happily situated in a narrow thermal belt, so that in the frosty mornings of winter the temperature was always several degrees higher than in the rest of the valley.
The mightiest volcano in this thermal belt last exploded about 40 years after Pompeii was engulfed.
Because hillsides are not quite as cold in winter as the lower ground beneath them, they're called thermal belts.
This zone of Central Valley thermal belts has hot, sunny summers--essential for sweet fruit--but seldom gets heavy freezes.