Portola California Climate Data

Monthly Average Climate Data for Portola California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January20.5 °F43.8 °F4.23 in.
February23.0 °F47.2 °F3.7 in.
March26.8 °F52.8 °F3.54 in.
April30.2 °F57.8 °F1.62 in.
May35.6 °F66.5 °F1.19 in.
June41.5 °F77.0 °F0.47 in.
July46.1 °F86.5 °F0.19 in.
August44.2 °F85.3 °F0.23 in.
September38.7 °F79.1 °F0.44 in.
October31.4 °F66.5 °F1.04 in.
November24.8 °F52.8 °F2.1 in.
December20.5 °F42.7 °F4.38 in.
Annual31.9 °F63.2 °F23.13 in.

Climate Data for Portola California

Average First Frost DateSep.1 - Sep. 10
Average Last Frost DateJul. 1 - Jul. 10
Average Days With FrostOver 180 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDsb - Humid Continental Climate - Dry Cool Summer
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