ROCKVILLE, MARYLAND

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Elevation: 127 meters Latitude: 39 06N Longitude: 077 06W

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DAILY WEATHER AVERAGE - 18 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	1.1 ^°C	4.9 ^°C	-3 ^°C	14 ^°C (2012)	-7 ^°C (2009)
Dewpoint	-4.6 ^°C	-0.8 ^°C	-7.4 ^°C	11 ^°C (2012)	-11 ^°C (2007)
Humidity	67.8 ^%	90 ^%	50.1 ^%		42 ^% (2007)
Barometer	1020.3 ^hPa	1023.4 ^hPa	1016.9 ^hPa	1031.2 ^hPa (2007)	1000.7 ^hPa (2012)
Wind Speed	8.4 ^km/h	21.2 ^km/h		37 ^km/h (2012)
Wind Gust		42.2 ^km/h		51.8 ^km/h (2012)
Precipitation	0.76 ^mm			0.76 ^mm (2007)

Weather Element	Average
Visibility	15.1 ^km
Wind Direction	SSE (162.4 °)

Weather Element	Total
Heating Degree Days	17.4 (Base 18.3)

Total Years on Record: 9

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