Joshua Tree is supposed to be good in the winter and Red rocks as well if youre doing shorter climbs in the sun. Ive been in northern California for the last week and it's a really mild winter, no real snow to speak of and have been out and climbed a couple of days near Tahoe which is usually not doable this time of year.
We're heading to Yosemite for a few days tomorrow on our way down to Joshua Tree for a couple of weeks the maybe get to Redrocks for a bit.
Get in touch if you get down that way.