can wet winters require more home heating than colder winters, in same place?
This probably has less to do with the rain and more to do with the wind. The wind helps move the colder air that is outside into your house more easily because there is more force being exerted on your exterior walls and therefore cooler air can work its way through any small cracks. Sorta similar to the wind chill being colder on windier days. The lessened amount of sun also comes into play as even in the dead of winter it helps warm surfaces, even just a tiny amount.

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