Union City California Climate Data

Monthly Average Climate Data for Union City California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January41.8 °F58.1 °F3.36 in.
February43.9 °F61.0 °F3.33 in.
March45.8 °F64.1 °F2.57 in.
April47.9 °F66.6 °F1.39 in.
May51.5 °F69.9 °F0.58 in.
June54.4 °F74.4 °F0.16 in.
July56.9 °F76.7 °F0.0 in.
August57.2 °F77.1 °F0.03 in.
September55.9 °F77.4 °F0.11 in.
October51.9 °F73.2 °F0.79 in.
November45.6 °F64.5 °F1.73 in.
December41.4 °F58.2 °F3.42 in.
Annual49.5 °F68.4 °F17.47 in.

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 : 25°F to 20°F
Plant Hardiness Zone - 2012Zone 10a : 30°F to 25°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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