On an E190 ZRH-LCY a few weeks ago, I think I took my jumper on and off about 5 times, as the temperature soared and dropped wildly, like a Cessna approaching FNC. I was in row 12, so I can only imagine what extremes the poor chaps at either end of the cabin must have endured. For future flights, I will dress for the beach, but bring a winter sleeping bag in my carry-on.