Rialto California Climate Data

Monthly Average Climate Data for Rialto California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January6.4 °C19.3 °C82.55 mm
February6.7 °C19.4 °C95.25 mm
March8.2 °C21.3 °C64.52 mm
April9.6 °C23.8 °C21.34 mm
May12.1 °C26.6 °C8.64 mm
June14.4 °C30.6 °C1.78 mm
July17.3 °C34.6 °C2.03 mm
August17.8 °C35.2 °C2.29 mm
September16.4 °C33.3 °C3.3 mm
October12.8 °C28 °C17.53 mm
November8.8 °C23.2 °C23.62 mm
December5.9 °C18.8 °C56.9 mm
Annual11.4 °C26.2 °C379.75 mm

Climate Data for Rialto California

Average First Frost DateDec. 11 - Dec. 20
Average Last Frost DateFeb. 21 - Feb. 29
Average Days With Frost10-20 Days
Plant Hardiness Zone - 2023Zone 10a : -1.1°C to 1.7°C
Plant Hardiness Zone - 2012Zone 10a : -1.1°C to 1.7°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCsa - Hot-Summer Mediterranean Climate
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