rain rider
I'll ride in nearly any weather and warm rain is fine by me. I am more concerned about my visibility and my glasses getting hard to see through. My best time on my 9 mile one way commute was on my mustache bar bike and I did it in 29 minutes. I average between 35 and 45 minutes depending on my energy level and the wind. I've never noticed the rain affecting me in any major way. I do think however that the cooling effect of rain may allow a harder effort coupled with the fact that we humans tend to want to get out of rain as rapidly as possible.