Just a couple quick observations/comments. I know a lot of people feel like hatcheries shouldn't ship in cold weather, but I do think it's a pretty tall ask of them to be meteorologists. I'm not sure how feasible it would be to have someone tracking the shipping routes of every order and the weather patterns along the way. As someone else suggested, do YOUR due diligence and check the weather to/from the hatchery of choice. If YOU aren't comfortable with the climate, then hold off and try to order another time.
Second, I'd much rather go to a local breeder or poultry show and purchase direct. Some of us simply don't have that option. My interest now is in Welsh Harlequins, and the only source I'm finding after days of scouring the web is the hatchery. My approach, as I'm not entirely comfortable with shipping live animals, is to try to find a) the most reputable breeder who is b) closest to my geographical location, figuring c) faster shipping times and less travel/stress. It's not perfect, but it's what I got.
Finally, I found this thread incredibly informative. I've been reading elsewhere about people ordering straight run ducklings or an assortment and receiving additional ducklings. It never occurred to me that I could open up a shipment of ducklings and find a dozen roosters. I'm now wondering what the threshold is for shipping. I'm planning on 6 ducklings. I've seen other companies advertising shipping as few as three with no mention of additional chicks for warmth.