Altadena California Climate Data

Monthly Average Climate Data for Altadena California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January46.3 °F67.6 °F5.0 in.
February46.0 °F67.1 °F6.1 in.
March47.6 °F69.9 °F3.52 in.
April49.6 °F71.9 °F1.43 in.
May52.9 °F75.3 °F0.88 in.
June56.4 °F80.4 °F0.35 in.
July61.3 °F87.5 °F0.1 in.
August62.3 °F91.6 °F0.03 in.
September61.2 °F85.9 °F0.23 in.
October56.7 °F80.6 °F1.09 in.
November50.2 °F74.2 °F1.24 in.
December46.0 °F66.7 °F3.28 in.
Annual53 °F76.6 °F23.25 in.

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 : 35°F to 30°F
Plant Hardiness Zone - 2012Zone 10a : 30°F to 25°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsa - Hot-Summer Mediterranean Climate