I am going to admit right now that I am a total wiener when it comes cold weather. I just curl up into a wimpy little ball when it comes to snow. Choosing to homeschool was based on a number of factors, but, between you and I, staying home when the weather is less than awesome is a huge influence.
That said, I truly believe that children should spend time outdoors everyday, regardless of the weather. I won't drive them around, but they have tons of yard here with every changing levels of snow to haul around and roll in. Or whatever they do. Frankly, I can't always see what they are doing from the other side of the window pane.