Altadena California Climate Data

Monthly Average Climate Data for Altadena California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January7.9 °C19.8 °C127 mm
February7.8 °C19.5 °C154.94 mm
March8.7 °C21.1 °C89.41 mm
April9.8 °C22.2 °C36.32 mm
May11.6 °C24.1 °C22.35 mm
June13.6 °C26.9 °C8.89 mm
July16.3 °C30.8 °C2.54 mm
August16.8 °C33.1 °C0.76 mm
September16.2 °C29.9 °C5.84 mm
October13.7 °C27 °C27.69 mm
November10.1 °C23.4 °C31.5 mm
December7.8 °C19.3 °C83.31 mm
Annual11.7 °C24.8 °C590.55 mm

Climate Data for Altadena California

Average First Frost DateJan. 21 - Jan. 31
Average Last Frost DateFeb. 1 - Feb. 10
Average Days With Frost5-10 Days
Plant Hardiness Zone - 2023Zone 10b : 1.7°C to 4.4°C
Plant Hardiness Zone - 2012Zone 10a : -1.1°C to 1.7°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsa - Hot-Summer Mediterranean Climate
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