Most people would say that there are no seasons in So CA. But there are changes throughout the year - mostly due to shorter or longer days. We actually have a short summer - about 60 days of hot weather and an equivalent of about 60 days of cool weather - but freezing is rare. The rest are spring/fall like days of varying temperatures and lengths. That's why it's so easy to live here.
Yep, we've got all four here. And honestly, I tend to get bored and anxious whenever a season gets towards its end, so I don't think I could stand living somewhere where they never changed, or changed very little. I'd go nuts!