How cold was the ice age?
During the Ice Age, the Earth's average temperature was about 12 degrees Fahrenheit colder than it is today. That was enough to keep snow from melting during the summers in northern regions.
Since most of the water on Earth's surface was ice, there was little precipitation and rainfall was about half of what it is today. During peak periods with most of the water frozen, global average temperatures were 9 to 18 degrees F below today’s temperature norms.
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