Atherton California Climate Data

Monthly Average Climate Data for Atherton California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January42.1 °F58.5 °F3.71 in.
February43.8 °F61.2 °F3.81 in.
March45.7 °F64.2 °F2.68 in.
April47.3 °F67.8 °F1.3 in.
May50.8 °F71.8 °F0.47 in.
June53.6 °F76.6 °F0.13 in.
July56.1 °F78.4 °F0.0 in.
August56.2 °F78.5 °F0.03 in.
September55.2 °F78.3 °F0.07 in.
October51.4 °F73.8 °F0.73 in.
November45.7 °F64.5 °F1.7 in.
December41.8 °F58.6 °F3.72 in.
Annual49.1 °F69.4 °F18.35 in.

Climate Data for Atherton California

Average First Frost DateDec. 21 - Dec. 31
Average Last Frost DateFeb. 1 - Feb. 10
Average Days With Frost5-10 Days
Plant Hardiness Zone - 2023Zone 9b : 25°F to 20°F
Plant Hardiness Zone - 2012Zone 9b : 25°F to 20°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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