While it is true that most of the rainforests on the Earth are tropical rainforests which grow in the areas along the equator in hot climate, there are also subtropical and temperate rainforests, which grow in surprisingly cool areas.
These grow in much lower latitudes - even in quite cold places like Canada, Norway, and the southern tip of South America.
What is a more important criteria for rainforests than temperature, is humidity - and rainfall.
All rainforests, whether tropical or temperate, require a lot of rain.
It's water that makes these forests so dense, lush and rich on species.
But, tropical rainforests typically get more rain than temperate ones.
They grow in low pressure zone along the equator, while temperate rainforests typically grow on coastal mountains, where the mountain ranges bring high rainfall (the rain shadow effect).
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Temperate Rainforest Climate
Climate for Tropical Rainforest
Amazon Rainforest Climate