Clarence DeMar Half Marathon
Clarence DeMar Half Marathon race day weather
Comfortable temps, warming through the race
Mild 57°F temps at gun time mean comfortable early miles without overheating risk. Temperatures rising to 72°F through the course will gradually increase perceived effort in the second half. Light winds shouldn't be a major factor for pacing. Moderate humidity at 69% is worth noting for effort level, especially in later miles.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Clarence DeMar Half Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
About the Clarence DeMar Half Marathon
The Clarence DeMar Half Marathon covers 13.1 miles from the Surry Mountain Lake recreation area in Surry to Keene State College. The route follows Route 12A and East Surry Road past Bretwood Golf Course, then runs into Keene along Court Street and Maple Avenue. Runners pass through Wheelock Park and along the bike path, then climb through Greenlawn and Woodland cemeteries before the last miles on Marlboro and Main Streets. The finish is on Appian Way, a pedestrian way at the college, where Clarence DeMar once coached.