Tough to beat southern California for year round riding. I can't remember the last time I missed a weekend because of weather.
I've been here since 1956 and there have been 2 damaging earthquakes. Not trying to minimize how terrible they are, but they don't happen very often.
As far as mudslides, these only affect a very few people in certain areas. The fires affect more people, but never the masses.
There are other reasons not to live here, it's expensive, can be crowded, and there are ******** about, but if you want club rides, races, track, or mtb, it's all here all year.