In the interest of full disclosure, I am an avid mountain biker. I enjoy riding several times a week, weather permitting, and for me that includes temperatures as low as 40 degrees, so long as the trails are clear and rideable with no residual damage. I have been known to get up at the crack of dawn, sneak away from the office in the middle of the day or hit the trails after work, rushing home for dinner after dark to the disapproving.