ST. HELENA, CALIFORNIA

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

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DAILY WEATHER AVERAGE - 28 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	6.2 ^°C	14.3 ^°C	0 ^°C	19 ^°C (2013)	-3 ^°C (2013)
Dewpoint	3.7 ^°C	7.8 ^°C	0 ^°C	18 ^°C (2011)	-3 ^°C (2013)
Humidity	86.9 ^%	100 ^%	67 ^%		30 ^% (2011)
Barometer	1021.7 ^hPa	1024 ^hPa	1019.6 ^hPa	1029.8 ^hPa (2011)	1016.6 ^hPa (2015)
Wind Speed	4.5 ^km/h	13 ^km/h		14.8 ^km/h (2011)
Precipitation	0.51 ^mm			0.51 ^mm (2012)

Weather Element	Average
Visibility	14 ^km
Wind Direction	ESE (126.3 °)

Weather Element	Total
Heating Degree Days	11.2 (Base 18.3)
Growing Degree Days	0.5 (Base 10)

Total Years on Record: 4

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