When I was a child, I'd be given the task of wading through the drifts up to the local post office to check on today's mail. When I'd ask that question, the old postmaster would roll his eyes and recite: "Neither snow nor rain nor heat nor gloom of night shall stay these couriers from their appointed rounds. Do you hear the word 'wind' in there, lad?"
"Ummmm, no, sir...."
"Well, there ya go! No mail yet!" And bang the window would slam.