Join Date: May 2004
Location: Wilmington, DE
Bikes: 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2014 Islabikes CNOC 14 (son's)
You won't find a temperature rating for a cycling jacket because how warm the jacket is depends on so many other factors. In any aerobic activity, your best bet for staying comfortable in the cold is to wear layers. Starting out with a heavy jacket on is a recipe for overheating. I think a lightweight, windproof (waterproof if you intend to ride in the rain) jacket is all you need. I have a Gill Prospeed jacket (there's basically nothing to it) that I've worn on rides down to 10F. I've been plenty warm at that temperature with just a longsleeve jersey and thin base layer shirt underneath. Most of my rides entail a lot of climbing though so I tend to build up heat quickly. On a flatter, faster ride, I might have needed more layers. Being able to vent your various layers to some extent is the only way to stay truly comfortable throughout a cold weather ride. How cold of temps do you plan on riding in?