Portola California Climate Data

Monthly Average Climate Data for Portola California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-6.4 °C6.6 °C107.44 mm
February-5 °C8.4 °C93.98 mm
March-2.9 °C11.6 °C89.92 mm
April-1 °C14.3 °C41.15 mm
May2 °C19.2 °C30.23 mm
June5.3 °C25 °C11.94 mm
July7.8 °C30.3 °C4.83 mm
August6.8 °C29.6 °C5.84 mm
September3.7 °C26.2 °C11.18 mm
October-0.3 °C19.2 °C26.42 mm
November-4 °C11.6 °C53.34 mm
December-6.4 °C5.9 °C111.25 mm
Annual-0 °C17.3 °C587.52 mm

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 : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDsb - Humid Continental Climate - Dry Cool Summer
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