Jeez Tony, you West Coast types really are wimps... :>)
In fact, its not a real Springfield show if it doesn't snow at least one day... A few years back we had a blizzard the first morning of Springfield. We showed up early to set up the booth and were greeted by a long line of hearty New England model railroaders waiting two hours or more outside - in the blinding snow - to get in! Now them's real model railroaders! Think I even saw Tim in that line....
This Tim is a bit wiser - stay in the car with a mug of coffee until just before the doors open. Also, bring a broom to sweep the snow away when leaving.