Well it all depends, our winters can be cold or nice, just stay in the lower elevations here and you wont see any snow, sometimes we have warm winters in the high 60's and low 70's but than it could be cold and windy when you get here, spring time is better, don't do the summer here its really hot..
Have you already reserved the RV, cause if you have not you could wait till you get here and check the weather so you don't waste your money, there is plenty of RV rental stores here, there will always be one available..
Oh and to answer your question yes these are good places to see in the winter but spring time is best.
:C