Our first December trip, the weather forecast the night before we left said it was going to be between 70 and 73 degrees the entire week, and it was correct for arrival day, but after that there was a heat wave!
We've had both kind of non-predicted extremes happen.
One early spring trip, it was supposed to be chilly our second day, then warm up. I sadly wanted to think the predicted cool-down was a mistake.
Instead the cold spell lasted all week! Well, over the first three days, we basically wore everything I brought. One night we went to MK wearing four layers!
Another time, we went to Epcot, on a day that was supposed to be chilly. It warmed up, and I discovered the white undershirt tank I'd worn was not opaque in sunlight!
Still one more time, was a very funny day. We'd booked one night at the YC, and planned to swim. In the morning it was raw, cold, windy, so we went to Epcot. An hour later, the sun came out and it was HOT! Off came the sweatshirts and jackets. We decided to swim after all. By the time we put on our suits, it was COLD again! So again, we put on our layers, and headed back into Epcot. Half an hour later, we were carrying our layers!
