POTOMAC, MARYLAND

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Elevation: 8 meters Latitude: 39 02N Longitude: 077 15W

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DAILY WEATHER AVERAGE - 21 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	4.3 ^°C	9.1 ^°C	-0.2 ^°C	21 ^°C (2013)	-8 ^°C (2009)
Dewpoint	-1.6 ^°C	3.9 ^°C	-6.3 ^°C	15 ^°C (2013)	-19 ^°C (2008)
Humidity	67.1 ^%	86.4 ^%	50 ^%		26 ^% (2008)
Barometer	1016.6 ^hPa	1020.3 ^hPa	1013.9 ^hPa	1030.8 ^hPa (2015)	992.2 ^hPa (2012)
Wind Speed	11.4 ^km/h	23.3 ^km/h		38.9 ^km/h (2008)
Wind Gust		40.6 ^km/h		57.5 ^km/h (2008)
Precipitation	5.08 ^mm			9.14 ^mm (2012)

Weather Element	Average
Visibility	15.6 ^km
Wind Direction	SSW (191 °)

Weather Element	Total
Heating Degree Days	13.9 (Base 18.3)
Growing Degree Days	3.3 (Base 10)

Total Years on Record: 9

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