We've not wintered over in the desert before this year, though we have RVed in Palm Desert and AZ in those months. Yesterday here in eastern Nevada we made a midday grocery run in short sleeves and were comfortable.
N = 1 is too small a sample from which to generalize, but at least this year what passes for 'winter' here on the eastern edge of the Mojave was the months of Dec. and Jan. Even then, except when the wind was blowing hard, a long-sleeved denim overshirt was all that was needed.
Meanwhile, this webcam photo shows what it looks like today at home in WY.
