He used to have problems with snow, sleet, and rain, not to mention fog and other visibility obstructions, but these haven't been a concern since he added Rudolph to his team many decades ago.
|Source: Rankin-Bass Productions, Inc.|
|Santa travels mighty fast, which is why you can't see him.|
But, Santa has an ace in the hole. He has some elves who used to work at Google and are incredible programmers. Using the global weather forecasts from the National Centers for Environmental Prediction and the European Center for Medium-range Weather Forecasting (ECMWF), combined with Santa's naughty and nice list, they have optimized Santa's route to minimize head winds and reduce wear and tear on Donner, Blitzen, Dancer, Vixen, Prancer, Dasher, Comet, Cupid, and Rudolph.
This is the real miracle of Christmas. Santa has been able to leverage numerical weather prediction to continue to deliver gifts to an exploding global population.
Merry Christmas from the Wasatch Weather Weenies.