Have you heard "It's been a mild winter so the bugs will be bad this summer"?

The rationale is that long, deep cold spells will kill many bug eggs. But Minn. and Alaska are famous for consistently producing mosquitoes big enough to carry off your first born, and it gets darn cold there every winter.

Is the statement in my question generally valid or not? Why the contradiction with my example? What am I missing? Are some bug eggs more tolerant to cold weather and others less? Grissom is on a field trip so I can’t ask him.