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Get the monthly weather forecast for Ontario, CA, including daily high/low, historical averages, to help you plan ahead.
The weather in Ontario in December is moderately chilly with a gentle breeze, with average highs of 64°F (18°C) and lows of 43°F (6°C).
Check accurate weather in December in Ontario (CA). Expect Ontario December temperature around 19°C (65°F). Read clothing tips & recommended activities.
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Ontario, California - Winter. December weather forecast. Average monthly weather with temperature, pressure, humidity, precipitation, wind, daylight, sunshine, visibility, and UV index data.
Weather reports from December 2022 in Ontario, California, USA with highs and lows.
The lowest daily average low temperature is 44°F on December 25. For reference, on August 21, the hottest day of the year, temperatures in Ontario typically range from 66°F to 93°F, while on December 24, the coldest day of the year, they range from 44°F to 66°F.
