Alta California Climate Data

Monthly Average Climate Data for Alta California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January1.7 °C9.9 °C274.32 mm
February1.5 °C10.8 °C265.18 mm
March2.3 °C13.1 °C243.08 mm
April4 °C15.9 °C137.41 mm
May7.6 °C20.6 °C84.58 mm
June11.7 °C26 °C25.4 mm
July15.9 °C30.3 °C2.03 mm
August16.1 °C30.2 °C3.3 mm
September12.9 °C27.3 °C13.97 mm
October8.7 °C20.9 °C77.98 mm
November4 °C13.3 °C165.1 mm
December1.4 °C8.9 °C302.51 mm
Annual7.3 °C18.9 °C1594.86 mm

Climate Data for Alta California

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost50-75 Days
Plant Hardiness Zone - 2023Zone 9a : -6.7°C to -3.9°C
Plant Hardiness Zone - 2012Zone 8b : -9.4°C to -6.7°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
2024 plantmaps.com