Perfect temp for it! Underarmor long underwear and a hoodie and I was set to go. I'm still getting used to my '12 Specialized Stumpjumper FSR. Finally found the optimal seat position. I also upped the psi in the rear shock to 250 psi. This might be of some interest to other Clydestale class riders like me. I'm currently 265 pounds. If I use Specialized fancy dancy autosag function it puts the psi @ 275. Ok. The problem is; every rear air shock is rated to operate @ a max of 250 psi. Running the psi @ 275 blew out my first rear shock in less than 50 miles. So it is currently maxed @ 250 psi. I have lost 35 pounds so far and have at least another 35 to lose to have everything work right