Weather Averages for Saint Helena, CA

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Latitude: 38°30'N, Longitude: 122°28'W, Elevation: 260.0 ft, Distance: 0.79 mi Saint Helena, CA Averages »

	Unit	Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average temperature over 68 years	°F	57	46	48	51	57	62	66	71	69	66	60	53	46
Average high temperature over 68 years	°F	73	56	61	65	71	78	84	89	89	86	77	66	57
Average low temperature over 68 years	°F	44	36	38	40	42	46	50	52	51	49	45	40	36
Average precipitation over 68 years	in	34.9	7.8	6.3	4.8	2.1	0.7	0.3	-	0.1	0.3	1.8	4.1	6.6
Average snowfall over 68 years	in	0.3	0.2	-	0.1	-	-	-	-	-	-	-	-	-
Average snow cover over 68 years	in	-	-	-	-	-	-	-	-	-	-	-	-	-
Heating degree days over 30 years	days	2927	583	412	391	284	123	30	5	-	31	123	375	570
Cooling degree days over 30 years	days	700	-	-	-	26	45	120	194	179	112	24	-	-

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