Walnut Creek California Climate Data

Monthly Average Climate Data for Walnut Creek California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January4.6 °C13.8 °C127 mm
February5.4 °C16.1 °C121.16 mm
March6.7 °C18.6 °C85.85 mm
April8.1 °C20.8 °C41.66 mm
May10.3 °C23.7 °C20.32 mm
June12.3 °C27.3 °C3.05 mm
July13.6 °C29.7 °C0.25 mm
August13.6 °C29.7 °C1.02 mm
September12.8 °C28.8 °C1.78 mm
October10.3 °C24.7 °C27.94 mm
November6.6 °C18.3 °C59.94 mm
December4.3 °C13.9 °C122.43 mm
Annual9.1 °C22.1 °C612.4 mm

Climate Data for Walnut Creek California

Average First Frost DateDec. 11 - Dec. 20
Average Last Frost DateFeb. 21 - Feb. 29
Average Days With Frost10-20 Days
Plant Hardiness Zone - 2023Zone 9b : -3.9°C to -1.1°C
Plant Hardiness Zone - 2012Zone 9b : -3.9°C to -1.1°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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