Mill Valley California Climate Data

Monthly Average Climate Data for Mill Valley California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January43.0 °F56.6 °F7.75 in.
February44.6 °F60.4 °F7.41 in.
March45.6 °F63.5 °F4.63 in.
April47.1 °F65.4 °F2.29 in.
May49.7 °F68.2 °F1.23 in.
June52.4 °F71.7 °F0.38 in.
July53.8 °F72.4 °F0.02 in.
August54.5 °F73.1 °F0.1 in.
September54.0 °F74.4 °F0.15 in.
October51.4 °F72.2 °F1.52 in.
November46.8 °F64.1 °F4.03 in.
December42.9 °F56.8 °F8.31 in.
Annual48.8 °F66.6 °F37.82 in.

Climate Data for Mill Valley California

Average First Frost DateJan. 1 - Jan. 10
Average Last Frost DateJan. 21 - Jan. 31
Average Days With FrostFrost Rare
Plant Hardiness Zone - 2023Zone 10a : 30°F to 25°F
Plant Hardiness Zone - 2012Zone 10a : 30°F to 25°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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