I paint en plein air all year round, but it's definitely tougher when I feel the air getting colder as we approach winter. Cold weather and watercolor don't mix because it doesn't dry on the paper and it also freezes on the palette.
I started today by painting a beautiful grave monument at Valleau. My other painting is of a salt storage area; I pass by the structure a lot and always think it would be cool to paint. The huge mound of salt looks like a mini dessert. There were some guys working at the salt storage and they came over to see my painting; it's always fun to talk to people while I'm en plein air.