Brentwood California Climate Data

Monthly Average Climate Data for Brentwood California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January4.4 °C13.1 °C71.63 mm
February5.8 °C15.8 °C66.8 mm
March7.6 °C18.7 °C47.24 mm
April9.2 °C21.5 °C25.15 mm
May11.7 °C25.3 °C12.45 mm
June13.9 °C29.4 °C3.56 mm
July15.1 °C32.1 °C0 mm
August15.1 °C31.6 °C0.51 mm
September14.2 °C29.9 °C1.52 mm
October11.2 °C25.2 °C15.75 mm
November6.8 °C18.2 °C35.31 mm
December4.3 °C13.3 °C68.83 mm
Annual9.9 °C22.8 °C348.75 mm

Climate Data for Brentwood California

Average First Frost DateDec. 1 - Dec. 10
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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