I'm afraid the most endorphin-generating conditions for me, catapulting me into stratospheres of bliss... are 45 degree temps and 12-15 mph winds.
Happens a lot around here
Agree on the "windbreaker" clue. Clingy layers are MUCH better.
Hands and feet are what can get cold - so cover them.
I also don't look at teh speedometer *at all.* I am going for *workout.* Heart rate eleveation, muscular development... which happens so much more efficiently when I have added drag. The wind is my "training drag" machine, so that I can get wickedly strong, so that when it's *not* windy ... oh, my, then I look at the speedo and GRIN!!!!