Gar Williams Half Marathon
Potomac, MD
- Half Marathon
- Road (Paved)
- Official race website
Local Historical Weather (Dec 14):
| 2014 | 2013 | 2012 | 2011 | 2010 | |
| H (°F) | 52 | 38 | 54 | 49 | 25 |
| L (°F) | 33 | 29 | 25 | 34 | 19 |
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