Most of northern California north of Sacramento/San Francisco (generally north of IR 80) is rural. The coast is spectacular, the Avenue of the Giants is majestic and there are many small campgrounds along the coast. There are also many RV parks. Wnters can have rain but it rarely snows along the coast. You will be a few hours from Lake Tahoe, Yosemite, Lassen. Lava Beds, and other national treasures if you care to travel although most of the Sierra's have real winters, cold and snow. If you like fishing and water the California Delta is laid back, rural, quiet, and has many RV parks. About the worst winter conditions are fog and rain. It never snows and winter days can easily be 50 degrees F. There are also many nice RV parks and some camping along SR 49 between Mariposa on the south and Auburn/Grass Valley on the north. Winters are very mild along this historical stretch of road. You might look into the Plymouth area as many winter with their RV there. Eastern California along the Colorado River is where many RVers winter, especially in the Lake Havasu area. Warm days with some wind occasionally, mostly desert.