Summer is here

Summer has finally arrive in NZ. :sunny: 32 C at the moment

In here Finland we must wait this even 6 months. #-o
This winter has been unusual in here. Last january here was 50cm snow, now nothing. Long time average temp. in january is -5oC and today it’s +1.6oC 8O
My avatar picture is last winter and here you can see today’s situation; http://www.antto.net/saa/kamera.html

is it beccuase of changes in the prevailing wind direction?
i.e more wind from the SW, or form warmer waters, etc?
changes in the patterns like that, which could be some long term (but changing ) patterns…i.e has it happened before?