I guess that's the advantage of living on the left coast, even way up here in the PNW. We can ride pretty much all year round. In the winter it gets a bit colder (right now it's 35 outside), and it rains a lot, but it rarely snows and even when it does, it doesn't tend to stick. The biggest problem here in the winter is the wind. Seattle is in between two mountain ranges, so the winds tend to funnel through the area pretty hard sometimes.

Even so, most people put their bikes away for the winter. In the summer I'll see 20-40 bikes during a normal commute. During the winter, I only see 3 or 4. Here in my office, we've got a few hard-core (for us) riders who run year-round, but not many. This week my bike is the only one in the racks.