Ontario California Climate Data

Monthly Average Climate Data for Ontario California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January43.9 °F67.3 °F3.3 in.
February44.6 °F67.6 °F3.87 in.
March46.9 °F70.7 °F2.33 in.
April49.4 °F74.5 °F0.69 in.
May53.6 °F78.3 °F0.38 in.
June57.5 °F84.7 °F0.1 in.
July62.2 °F91.3 °F0.05 in.
August63.0 °F93.1 °F0.02 in.
September61.1 °F90.1 °F0.11 in.
October55.2 °F81.9 °F0.62 in.
November47.9 °F73.9 °F0.81 in.
December43.2 °F66.4 °F2.28 in.
Annual52.4 °F78.3 °F14.56 in.

Climate Data for Ontario California

Average First Frost DateDec. 21 - Dec. 31
Average Last Frost DateFeb. 11 - Feb. 20
Average Days With Frost5-10 Days
Plant Hardiness Zone - 2023Zone 10a : 30°F to 25°F
Plant Hardiness Zone - 2012Zone 10a : 30°F to 25°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsa - Hot-Summer Mediterranean Climate
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