Let's see if I understand this correctly.
Easyjet have cancelled your flight. They advised you of the cancellation more than two weeks before the flight departs. They have claimed "exceptional weather" as the reason for the cancellation. This is the first you have heard of this cancellation but they are saying you have asked for a refund.
I'd say they are clairvoyant - they can predict the weather two weeks ahead and that you will ask for a refund.
Now I'll be a clairvoyant - I would guess that either something has happened to one or more aircraft in the bad weather we've elready had so they don't have enough any more or that their crews have used up so many hours they won't have enough to operate all flights in 2 weeks time.