Napa California Climate Data

Monthly Average Climate Data for Napa California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January38.7 °F57.0 °F5.21 in.
February40.6 °F60.9 °F5.03 in.
March42.6 °F64.9 °F3.54 in.
April44.5 °F68.8 °F1.77 in.
May48.2 °F73.4 °F0.95 in.
June51.9 °F78.9 °F0.24 in.
July54.0 °F81.1 °F0.0 in.
August54.1 °F81.5 °F0.03 in.
September51.9 °F81.7 °F0.1 in.
October48.0 °F76.1 °F1.21 in.
November42.2 °F65.2 °F2.65 in.
December38.6 °F57.1 °F5.37 in.
Annual46.3 °F70.6 °F26.1 in.

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 : 25°F to 20°F
Plant Hardiness Zone - 2012Zone 9b : 25°F to 20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate