I think it was 22 today, but 32 yesterday (Palm Springs)...the temperature is very up and down, but it will be hot but not 45 degrees again until June or July. You will see 20s if you head this far south, so probably would want to swap tires. Maybe store them somewhere and pick them up on the way out?
I don't recommend winter tires in southern Cali at all, they are too soft on a hot road.
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