RE: Winter Storage
I guess I'm fortunate to live here at least during the winters. There are a lot of fogged in or rainy days but we can still do some flying throughout the winter even if it does get a little icy and cool.
If I lived in your area, I'd be stubborn and bolt skis on my plane and try to keep flying. Either that or move south for a few months.
I'd be sure to oil your engines good and charge your batteries from time to time. I imagine some of the flyers up in the northern latitudes have some better advice.