We are from CA and used to warm weather.
We had an Illuminations dinner last year, just after Thanksgiving, and it was FREEZING! Wind whipping off the water, really cold.
As the guests were arriving, the event manager offered me the option of space heaters, for $1200. more. I was torn in the moment, but I didn't want the guests to freeze, so I said yes, bring them in. The heaters did NOTHING to warm people up, the waiters insisted on placing them far away from the tables for safety reasons, so the only way you could get warm was to go stand right next to a heater. One heater never worked, they couldn't get it going all night, but still charged me for it, which I found annoying.
We went and bought Disney parka-like jackets at the little store by the back door of Epcot and everyone made due, but it was COLD. Not reccommended.
Pixie dust,
Susy