ST. HELENA, CALIFORNIA

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

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DAILY WEATHER AVERAGE - 5 SEPTEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	14.9 ^°C	23.7 ^°C	9.3 ^°C	28 ^°C (2015)	7 ^°C (2015)
Dewpoint	9.5 ^°C	11.3 ^°C	7 ^°C	13 ^°C (2011)	0 ^°C (2015)
Humidity	76.4 ^%	97.7 ^%	41.7 ^%		20 ^% (2012)
Barometer	1014.9 ^hPa	1016.3 ^hPa	1013.2 ^hPa	1016.6 ^hPa (2012)	1012.5 ^hPa (2015)
Wind Speed	10.3 ^km/h	23.5 ^km/h		25.9 ^km/h (2012)
Wind Gust		29.6 ^km/h		31.5 ^km/h (2015)
Precipitation	---			--- ()

Weather Element	Average
Visibility	11.9 ^km
Wind Direction	WSW (254.5 °)

Weather Element	Total
Heating Degree Days	1.8 (Base 18.3)
Growing Degree Days	6.5 (Base 10)

Total Years on Record: 3

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