Hercules California Climate Data

Monthly Average Climate Data for Hercules California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January42.5 °F56.0 °F3.78 in.
February43.8 °F60.1 °F4.11 in.
March46.1 °F64.0 °F2.66 in.
April48.1 °F67.3 °F1.3 in.
May51.5 °F71.0 °F0.61 in.
June54.3 °F75.1 °F0.16 in.
July56.1 °F77.1 °F0.0 in.
August56.4 °F77.1 °F0.04 in.
September55.6 °F77.7 °F0.07 in.
October52.3 °F73.4 °F0.84 in.
November46.5 °F64.1 °F2.02 in.
December42.5 °F56.4 °F3.97 in.
Annual49.6 °F68.3 °F19.56 in.

Climate Data for Hercules California

Average First Frost DateJan. 21 - Jan. 31
Average Last Frost DateJan. 21 - Jan. 31
Average Days With FrostFrost Free
Plant Hardiness Zone - 2023Zone 9b : 25°F to 20°F
Plant Hardiness Zone - 2012Zone 9b : 25°F to 20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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