Rode from home over Hansen Dam (when it was a nice 72F), up Little T, and followed a route I had mapped out to Golden State Hwy and Whitaker Peak Rd.: http://ridewithgps.com/routes/6870183 This route used what is a new way for me to cross the Santa Clarita area in both directions. I made some use of bike paths in each direction., and a new, little climb -- White Cnyn Rd provides a nice, sustained 8%. It started raining while I was on Sand Canyon, and stopped when I started up the Ridge Route Rd. It started raining on me again as I neared the bottom of Ridge Route Rd, and continued raining all the way home. I followed the mapped route until I reached Sierra Hwy, but then, instead of returning over Little T, I took Foothill back because I was plenty cold by that time. I turned back 2.0 miles short of Whitaker Peak because twilight was just ending and the road turned to dirt, and I could not see that pavement started again further up. Also, the temperature had dropped to 34F, and I was afraid I could get into some serious trouble without more warm things to wear if I had a flat or some other problem. I was just barely managing the temperature while peddling. Descending the 2 miles back to Golden State Hwy was enough for my fingers to go numb from the cold, so it was a good idea that I turned back when I did. When I made it home, I found that the skin on my legs and feet was turning blotchy red, with some stinging and itching; and I think I was having an allergic reaction to toxins or some other substance on the road, probably when I went by oil fields, etc.