I've rode year round before. I was living in the mountains of NC, so there were all 4 seasons. My bike did fine. The biggest limiting factor was rider endurance of those seasons. In colder weather, I would bundle up nicely, and wear thermal underwear under my jeans, coat with a sports wind breaker under it, with a normal sport jogging jacket under that, plus whatever shirt I was wearing. Gloves are a must. I currently use Harbor Freight water resistant "insulated" work gloves. They are the blue and black ones. $11 or so. They're actually really nice. I would also wear hiking/trail shoes/boots as they're usually water resistant and mildly insulated. Lastly, I always wear a full faced helmet. I currently have a modular Hemet and chose it as I got tired of having a to swap between a full faced helmet when it's colder and an open face during warmer months... or being stuck with a full face in July/August heat! & humidity, yuck! Carry an emergency poncho in your underseat bin JIC.