Southern California has two seasons: ski season and conditioning for ski season and both are good for biking. Flowers bloom all year around so who needs Spring? Fall, just drive to Yuccipa, eastern Sierras or Tahoe for fall colors no leaves to rake when you get home. Winter, drive or fly to the snow. The snow is on the mountains for the skiers and snowboarders, ice is on skating rinks and in drinks; putting either on the sidewalks and streets is just plain stupid - it not a complicated program, get with it! Just pick your season when you want.
Don't tell me your do not want to be around earthquakes: Quebec province and Rockville Maryland just had them.