The last several years I see them all year around here in Nor-Cal. They don't seem to have the same problem with cold, wet weather as the Mourning Doves do and don't bail for warmer climates, but hang around all year.
I even saw quite a few of them over at Tulelake this March, at 4500' elevation, with snow on the ground and temperatures getting down into the teens at night.

Gordon

If you don't fly first class, your heir's will!