Oops -- put this in the wrong thread!
The morning's temperature in DC was a bit lower than 30 F -- 19.9 F (-6.7 C), to be exact. Wind chills were -6 F (-21 C). That's why it seemed brisk!
The pavement was so dry that I decided to try the Washington Boulevard and Route 50 trails. As in your area, they had been used as repositories for plowed show in spots. There were a few 30 foot stretches of glare ice, but they were mostly dry and clear. I had to walk the bike around a few 5 foot mounds, but they were otherwise passable. It was good to arrive at work without the 10 minute penalty of my detour out Columbia and Walter Reed, and I enjoyed the adventure.
Paul