Year round which doesn't mean much in the SF Bay Area where cold is 40 and very, very cold is in the 30s.
Sunday I rode to breakfast because that's what I do on most Sundays. Some breakfast rides are 60 miles and others are 200.
The previous Saturday I rode my vintage beemer to an overnight camp-out a couple of hundred miles away if you go the long way (I did).
Today I had errands to run so rode the modern bike (more storage space) to the hardware store and Trader Joe's.
I'm also a mid-week rider in the fall, winter, and spring.
My wife has a car. I have the bikes. Been that way for a long, long time.