Union City California Climate Data

Monthly Average Climate Data for Union City California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January5.4 °C14.5 °C85.34 mm
February6.6 °C16.1 °C84.58 mm
March7.7 °C17.8 °C65.28 mm
April8.8 °C19.2 °C35.31 mm
May10.8 °C21.1 °C14.73 mm
June12.4 °C23.6 °C4.06 mm
July13.8 °C24.8 °C0 mm
August14 °C25.1 °C0.76 mm
September13.3 °C25.2 °C2.79 mm
October11.1 °C22.9 °C20.07 mm
November7.6 °C18.1 °C43.94 mm
December5.2 °C14.6 °C86.87 mm
Annual9.7 °C20.3 °C443.73 mm

Climate Data for Union City California

Average First Frost DateJan. 1 - Jan. 10
Average Last Frost DateFeb. 1 - Feb. 10
Average Days With Frost5-10 Days
Plant Hardiness Zone - 2023Zone 9b : -3.9°C to -1.1°C
Plant Hardiness Zone - 2012Zone 10a : -1.1°C to 1.7°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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