Because I firmly believe there is no such thing as bad weather… just bad clothing, I found a great online resource to help me figure out what to wear when running in various weather conditions:
Runner’s World – What to Wear for Runners
http://www.runnersworld.com/cda/whattowear/0,7152,s6-240-325-330-0,00.html
I use this tool all the time. Particularly this time of year when the weather conditions are changing so frequently that I can’t remember what’s comfortable.