I had some eggs that were sent to me last week, from another part in WA, and it is about high 30s and low 40s here, but it was fine. Got here in 2 days, rested the eggs, set them in, and candled them yesterday even though its been only 4 days, and I already saw development in most of them. I did ask the breeder to write on the box to call me once it got to the PO so that I can go and pick it up myself first thing in the morning, so the eggs don't go bumping around on the postal route, or get left out at the gate in the cold. Since I picked it up early, I had more time to rest the eggs, and I could set them as soon as I could, after the required minimum of 8 hours.
Several weeks before, I also had 2 different batches of eggs sent to me, 1 from Florida, and 1 from California. They also came fine, and they are due to hatch any day now. I'm expecting some Christmas babies.
I think it can be done, but I wouldn't order them right now, due to the Christmas package rush. They will be prone to be chucked around for faster delivery. And if you can pick up the package from your PO first thing in the morn, that will help too, I think.