Napa California Climate Data

Monthly Average Climate Data for Napa California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January3.7 °C13.9 °C132.33 mm
February4.8 °C16.1 °C127.76 mm
March5.9 °C18.3 °C89.92 mm
April6.9 °C20.4 °C44.96 mm
May9 °C23 °C24.13 mm
June11.1 °C26.1 °C6.1 mm
July12.2 °C27.3 °C0 mm
August12.3 °C27.5 °C0.76 mm
September11.1 °C27.6 °C2.54 mm
October8.9 °C24.5 °C30.73 mm
November5.7 °C18.4 °C67.31 mm
December3.7 °C13.9 °C136.4 mm
Annual7.9 °C21.4 °C662.94 mm

Climate Data for Napa California

Average First Frost DateDec. 1 - Dec. 10
Average Last Frost DateFeb. 21 - Feb. 29
Average Days With Frost10-20 Days
Plant Hardiness Zone - 2023Zone 9b : -3.9°C to -1.1°C
Plant Hardiness Zone - 2012Zone 9b : -3.9°C to -1.1°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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