The shortest day of the year is December 21 in the northern hemisphere and our coldest months are December, January, and February.
Why are our coldest months not November, December, and January?
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It takes time for the Earth to cool down. There’s a lot of air and water and dirt that needs to change temperature. The day with the least sun exposure will cool it the most (out of any particular day), but it will still continue to cool on the following days.
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