Joining this thread - I normally just take the weather as it comes, but we are supposed to be doing a 5 hour drive to Yorkshire on the 21st, and back on the 23rd. I really hope it's either completely clear and dry, so we can go, or thick snow, so we cancel.
The worst position is that it is a bit iffy, so we go, then get stuck. Or, we cancel, and MIL goes bonkers!