Make your own snow paint at home with the kids. Such a fun winter activity for toddlers and preschoolers that you can do inside when it's wet and cold. An easy paint recipe you can adapt for all sorts of snow and winter creations.
This shaving cream rain clouds experiment is fun to watch and a great way to explain to preschoolers how clouds work and teach them about the weather. Its a really easy science experiment you can try at home.