The 2025 event has concluded.

Clarence DeMar Marathon

Keene, NH, USA • September 28, 2025
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clear-day Clear conditions throughout the day.

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When is the 2025 Clarence DeMar Marathon?

The 2025 Clarence DeMar Marathon will be held on Sunday September 28, 2025.

Is the Clarence DeMar Marathon a Boston Marathon Qualfier?

Yes, the Clarence DeMar Marathon is an official Boston Marathon qualifier.

Historical Weather

Based on 16 years of data
Avg Temp
68°F
L:50°H:69°
RunScore
8
Conditions
Rain Freq
13%
2 of 16 yrs
Wind7mph
Dew51°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScore

2024 Clarence DeMar Marathon

Partly cloudy throughout the day.

2024
cloudy
57°/66°-
8

2023 Clarence DeMar Marathon

Cloudy skies throughout the day with rain.

2023
cloudy
52°/63°-
9

2022 Clarence DeMar Marathon

Partly cloudy throughout the day with late afternoon rain.

2022
partly-cloudy-day
40°/64°-
7

2021 Clarence DeMar Marathon

Partly cloudy throughout the day.

2021
partly-cloudy-day
53°/68°-
8

2019 Clarence DeMar Marathon

Clearing in the afternoon.

2019
partly-cloudy-day
61°/66°-
8

2018 Clarence DeMar Marathon

Partly cloudy throughout the day with morning rain.

2018
rain
42°/62°Light
8

2017 Clarence DeMar Marathon

Clear conditions throughout the day.

2017
clear-day
55°/92°-
7

2016 Clarence DeMar Marathon

Clearing in the afternoon.

2016
fog
36°/61°-
7

2015 Clarence DeMar Marathon

Clearing in the afternoon.

2015
fog
34°/66°-
8

2014 Clarence DeMar Marathon

Clearing in the afternoon.

2014
fog
54°/81°-
8

2013 Clarence DeMar Marathon

Partly cloudy throughout the day.

2013
fog
44°/69°-
8

2012 Clarence DeMar Marathon

Partly cloudy throughout the day with late afternoon rain.

2012
cloudy
54°/59°-
9

2011 Clarence DeMar Marathon

Partly cloudy throughout the day.

2011
fog
64°/75°-
8

2010 Clarence DeMar Marathon

Partly cloudy throughout the day.

2010
cloudy
49°/70°-
8

2009 Clarence DeMar Marathon

Cloudy skies throughout the day with a chance of rain throughout the day.

2009
rain
50°/63°Light
7

2008 Clarence DeMar Marathon

Cloudy skies throughout the day with rain.

2008
cloudy
63°/72°-
8
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