The temperature is only one of the factors that you have to worry about. Fertility, packaging, and shipping are more important factors. Shipped eggs usually do not hatch very will because of rough conditions during shipping. Poor packaging may cause the eggs to break during transportation. Temperature changes may affect the hatchability, but you have to worry about that during warmer months as well. If you feel like the eggs would survive shipping and are fertile, I think that it would be okay to get them now. Just remember, when eggs are exposed to temperatures too cold or too hot for so long, they do begin to lose their viability.