ST. HELENA, CALIFORNIA

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Elevation: 52 meters Latitude: 38 26N Longitude: 122 25W

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DAILY WEATHER AVERAGE - 19 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	7.3 ^°C	14.3 ^°C	1.3 ^°C	19 ^°C (2011)	-3 ^°C (2012)
Dewpoint	2.9 ^°C	8.5 ^°C	-3 ^°C	19 ^°C (2011)	-12 ^°C (2013)
Humidity	78.6 ^%	98.3 ^%	55.3 ^%		19 ^% (2012)
Barometer	1017.9 ^hPa	1021 ^hPa	1015.6 ^hPa	1027.4 ^hPa (2012)	1007.8 ^hPa (2013)
Wind Speed	7.4 ^km/h	19 ^km/h		22.2 ^km/h (2013)
Wind Gust		31.5 ^km/h		33.3 ^km/h (2013)
Precipitation	3.81 ^mm			3.81 ^mm (2015)

Weather Element	Average
Visibility	14.6 ^km
Wind Direction	SSE (170.1 °)

Weather Element	Total
Heating Degree Days	10.6 (Base 18.3)
Growing Degree Days	0.5 (Base 10)

Total Years on Record: 4

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