<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Why is the northern hemisphere winter solstice in December, but late January and early February are always the coldest times of the year?
<|assistant|>
The northern hemisphere winter solstice happens around December 22nd, which is when the day is the shortest and the night is the longest. This means that there is less natural light present, resulting in colder temperatures. However, late January and early February are usually the coldest months of the year because it is when cold Arctic air masses are the most common.