Brentwood California Climate Data

Monthly Average Climate Data for Brentwood California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January39.9 °F55.6 °F2.82 in.
February42.5 °F60.5 °F2.63 in.
March45.6 °F65.7 °F1.86 in.
April48.6 °F70.7 °F0.99 in.
May53.0 °F77.6 °F0.49 in.
June57.1 °F84.9 °F0.14 in.
July59.1 °F89.8 °F0.0 in.
August59.2 °F88.8 °F0.02 in.
September57.6 °F85.9 °F0.06 in.
October52.1 °F77.4 °F0.62 in.
November44.3 °F64.8 °F1.39 in.
December39.7 °F55.9 °F2.71 in.
Annual49.9 °F73.1 °F13.73 in.

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 : 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