ST. HELENA, CALIFORNIA

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

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DAILY WEATHER AVERAGE - 21 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	9.2 ^°C	15 ^°C	4.8 ^°C	18 ^°C (2013)	-2 ^°C (2011)
Dewpoint	8.2 ^°C	12.5 ^°C	4.3 ^°C	15 ^°C (2011)	-2 ^°C (2013)
Humidity	95 ^%	100 ^%	80.5 ^%		52 ^% (2012)
Barometer	1016.6 ^hPa	1019.6 ^hPa	1013.9 ^hPa	1022 ^hPa (2011)	1010.2 ^hPa (2015)
Wind Speed	7.9 ^km/h	25.6 ^km/h		31.5 ^km/h (2011)
Wind Gust		41.4 ^km/h		50.1 ^km/h (2011)
Precipitation	35.05 ^mm			36.32 ^mm (2015)

Weather Element	Average
Visibility	11.4 ^km
Wind Direction	ESE (121.3 °)

Weather Element	Total
Heating Degree Days	8.4 (Base 18.3)
Growing Degree Days	1 (Base 10)

Total Years on Record: 4

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