Guerneville California Climate Data

Monthly Average Climate Data for Guerneville California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January38.5 °F57.4 °F9.11 in.
February39.6 °F60.8 °F9.29 in.
March41.3 °F63.6 °F6.68 in.
April42.8 °F67.3 °F3.23 in.
May45.9 °F72.5 °F1.87 in.
June49.0 °F77.8 °F0.24 in.
July50.8 °F79.0 °F0.05 in.
August51.2 °F80.7 °F0.07 in.
September49.1 °F79.4 °F0.14 in.
October45.7 °F75.0 °F2.1 in.
November41.0 °F65.1 °F4.85 in.
December37.7 °F57.5 °F11.04 in.
Annual44.4 °F69.7 °F48.67 in.

Climate Data for Guerneville California

Average First Frost DateNov. 21 - Nov. 30
Average Last Frost DateMar. 21 - Mar. 31
Average Days With Frost20-30 Days
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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