CLIMATE CHARTS

Saint Helena, California

Latitude: 38.5067 Longitude: -122.4714

Elevation: 225.1 feet (68.6 meters)

Saint Helena, California Temperature Chart Daily average maximum and minimum temperatures for Saint Helena, California Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High & Low Temperature °F  °C -30 -34.4 -20 -28.9 -10 -23.3 0 -17.8 10 -12.2 20 -6.7 30 -1.1 40 4.4 50 10.0 60 15.6 70 21.1 80 26.7 90 32.2 100 37.8 110 43.3 Saint Helena, California Precipitation Chart Precipitation chart for Saint Helena, California Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Precipitation In. Cm. 0.00 0.00 0.10 0.25 0.20 0.51 0.30 0.76 0.40 1.02 0.50 1.27 0.60 1.52 0.70 1.78 0.80 2.03 0.90 2.29 1.00 2.54 Daylight Chart for SAINT HELENA, CA Daylight chart for SAINT HELENA, CA. Latitude 38.5. Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Sunrise/Sunset Daylight NOON NOON 0 0 2 2 4 4 6 6 8 8 10 10 12 12 14 2 16 4 18 6 20 8 22 10 24 12

Monthly Data Table for Saint Helena, California

Imperial Units
Statistic Units Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum Temperature °F 57.8 62.0 66.5 72.0 78.8 85.2 89.1 88.9 86.0 77.5 65.1 57.4
Minimum Temperature °F 38.6 40.8 42.8 45.0 49.5 53.4 55.0 54.6 52.3 48.2 42.7 38.1
Heating Degree Days °F 521 381 324 210 93 17 2 2 18 107 335 535
Cooling Degree Days °F 0 0 3 15 66 146 220 212 143 40 2 0
Precipitation in. 6.94 7.36 5.11 1.98 1.30 0.16 -77.77 0.05 0.28 1.85 4.49 7.12

Metric Units
Statistic Units Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum Temperature °C 14.3 16.7 19.2 22.2 26.0 29.6 31.7 31.6 30.0 25.3 18.4 14.1
Minimum Temperature °C 3.7 4.9 6.0 7.2 9.7 11.9 12.8 12.6 11.3 9.0 5.9 3.4
Heating Degree Days °C 289 212 180 117 52 9 1 1 10 59 186 297
Cooling Degree Days °C 0 0 2 8 37 81 122 118 79 22 1 0
Precipitation cm. 17.63 18.69 12.98 5.03 3.30 0.41 -197.54 0.13 0.71 4.70 11.40 18.08
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