Race Day Weather
Comfortable temps, big temp swing
Mild 51°F temps at gun time mean comfortable early miles without overheating risk. Temps will climb significantly to 69°F by later miles, so expect fading conditions as the race progresses. Light winds shouldn't be a major factor for pacing. Moderate humidity at 75% is worth noting for effort level, especially in later miles.
Pace Calculator
The Clarence DeMar Marathon offers a scenic 26.2-mile journey through New Hampshire's picturesque countryside, featuring gentle rolling hills and a net elevation drop that makes it a prime Boston Marathon qualifier. Runners are treated to stunning views of early autumn foliage, with the course culminating at the historic Appian Way of Keene State College, near where marathon legend Clarence DeMar once coached collegiate runners. The event is renowned for its exceptional organization and the enthusiastic support of over 300 volunteers, creating a welcoming atmosphere for participants of all levels. Source
Historical Weather
Temperature History
Range of temperatures during race hours for each year.
Detailed History
| Year | Conditions | Low / High | Rain | Dew Point | Score |
|---|---|---|---|---|---|
2025 |  | 57°/82° | - | 61° | |
2024 |  | 57°/66° | - | 54° | |
2023 | | 52°/63° | - | 51° | |
2022 | | 40°/64° | - | 47° | |
2021 | | 53°/68° | - | 50° | |
2019 | | 61°/66° | - | 47° | |
2018 |  | 42°/62° | Light | 45° | |
2017 |  | 55°/92° | - | 62° | |
2016 | | 36°/61° | - | 36° | |
2015 | | 34°/66° | - | 37° | |
2014 | | 54°/81° | - | 52° | |
2013 | | 44°/69° | - | 45° | |
2012 | | 54°/59° | - | 51° | |
2011 | | 64°/75° | - | 64° | |
2010 | | 49°/70° | - | 48° | |
2009 | | 50°/63° | Light | 54° | |
2008 | | 63°/72° | - | 62° |