Instead of cold a rainy, it was cool, damp and windy, so I decided to go for it. I think I managed to dress about right for the conditions, but the wind really slowed me down.
As far as clif bars go, as a diabetic, I tend to avoid that sort of processed carbs. While I do increase my carb intake on riding days, I'm still pretty picky about the type of carbs and how fast they hit my system. I may have to try one to see what it does to me, but I'm skeptical about how well I'd do with them.