"What will their reaction be? Will they think it's an early winter?"

Probably not. My guess is that, like most of nature, their sense of "winter" is brought on by available light, not temperature. However, you could try singing, "Baby, It's Cold Outside", or "Sleigh Ride".

You could, on the other hand, smoke them out. Bee keepers can usually slow the movement of a hive by smoke. Figure out a way to engulf their hive in smoke, and you may be able to safely move the whole thing.