I saw the first mosquitoes today!
Hard to believe, but that’s what happens when the ambient temperature goes above freezing for a few days, even in the midst of winter. Several species of mosquitoes, like Anopheles freeborni, hibernate as full grown adults. Some call it hibernation, some call it diapause and not all mosquitoes making it through winter may use the same mechanism to prevent freezing and dehydration.
Call it what you want. The skeeters are of to an early start.