Took the old Vickers Funbus to Denver last month. When we landed at Buckley, it was +25 deg C. On the way to the (rather nice) hotel, it dropped to +3 deg C in 2-3 minutes and 40 kt winds blew up. We were able to make snowballs on the way back from Hard Rock; next day it was +15 deg C again........weird, very weird. Apparently it hadn't done that for over 20 years....so we legged it to San Antonio!