It takes a long time for it to get that cold and then it takes a long time for it to warm back up.
I live in Minnesota. In the middle of the winter is probably 10 degrees colder here in the middle of the winter than it is in Boston or Philadelphia. Our daily averages get as cold as Boston ever gets in early December and stay that cold or colder until mid-February. So, we have to get colder faster in October and November to get down that far and then our warm-up is delayed in the spring as well.
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