Here in California, that means cooler temperatures and possibly rain. We've had it all this week. Temperatures plummeted to the mid 30's earlier this week, and we've had a couple of days of rain. I got in a couple of rides, but I stayed in on the rainy days.
I purchased a "winter kit" in November. it's gotten use this year. Sun is forecast for tomorrow morning, so I'll take a Saturday morning ride.