Port Costa California Climate Data

Monthly Average Climate Data for Port Costa California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January4.7 °C13.7 °C105.66 mm
February5.6 °C16 °C101.85 mm
March7.2 °C18.6 °C70.61 mm
April8.6 °C20.9 °C36.83 mm
May10.8 °C23.4 °C16 mm
June12.7 °C26.4 °C3.3 mm
July13.8 °C28.1 °C0 mm
August13.7 °C27.9 °C0.76 mm
September12.9 °C27.6 °C1.78 mm
October10.7 °C24.4 °C22.35 mm
November6.8 °C18.2 °C51.05 mm
December4.5 °C13.8 °C103.63 mm
Annual9.3 °C21.6 °C513.82 mm

Climate Data for Port Costa California

Average First Frost DateJan. 1 - Jan. 10
Average Last Frost DateFeb. 1 - Feb. 10
Average Days With FrostFrost Rare
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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