Can someone answer the following question?

Question

Why is it that (at least around here in New Jersey, anyway) Winter cold snaps come and go within only a couple of days or so while Summer heat waves go on and on through nearly half the year?

We've got a forecast for this weekend cold snap, but it will be quickly followed by Spring-like temperatures by Tuesday.  If this were a Summer heat wave, it would be non-stop 80s and 90s with oppressive humidity for days and weeks on end.  Cold weather is always far shorter than hot weather.  Why?

Answer 1

Well even here in Sweden it happens sometimes. Now already in February it feels like Spring is coming but it´s still pretty cold outside though. Most of the times the snow here stays for 1-2 months in my area. But the summer is still not usually very warm here.

Answer 2

I blame MTV's Beach House.