Fullerton California Climate Data

Monthly Average Climate Data for Fullerton California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January8.1 °C20.3 °C79.25 mm
February8.6 °C20.3 °C85.34 mm
March10 °C21.1 °C49.28 mm
April11.2 °C22.9 °C16.26 mm
May13.7 °C24 °C6.86 mm
June15.7 °C26 °C2.03 mm
July17.6 °C28.9 °C1.02 mm
August17.9 °C29.9 °C0 mm
September16.9 °C29.5 °C3.05 mm
October14.3 °C26.9 °C12.45 mm
November10.4 °C23.2 °C19.56 mm
December7.6 °C20 °C56.39 mm
Annual12.7 °C24.4 °C331.49 mm

Climate Data for Fullerton California

Average First Frost DateNo Frost
Average Last Frost Date
Average Days With FrostFrost Free
Plant Hardiness Zone - 2023Zone 10b : 1.7°C to 4.4°C
Plant Hardiness Zone - 2012Zone 10b : 1.7°C to 4.4°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsa - Hot-Summer Mediterranean Climate
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