Ontario
California, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Ontario, CA

A clear street near the luxurious residential estate in Ontario, California, with a scenic background of a hilly landscape, the clear blue sky
A clear street near the luxurious residential estate in Ontario, California, with a scenic background of a hilly landscape, the clear blue sky
January, like December, in Ontario, California, is another enjoyable winter month, with temperature in the range of an average high of 65.1°F (18.4°C) and an average low of 43.9°F (6.6°C).

Temperature

January is the coldest month, with an average high-temperature of 65.1°F (18.4°C) and an average low-temperature of 43.9°F (6.6°C).

Rainfall

In Ontario, California, 3.3" (84.1mm) of precipitation is typically accumulated. Throughout the year, in Ontario, 15" (382mm) of rain is accumulated.

Daylight

The average length of the day in January in Ontario is 10.2h.

What is the coldest month in Ontario?

January is the coldest month in Ontario, with an average high-temperature of 65.1°F (18.4°C) and an average low-temperature of 43.9°F (6.6°C).

What is the temperature in January in Ontario?

The average high-temperature, in January, in Ontario, California, is 65.1°F (18.4°C), while the average low-temperature is 43.9°F (6.6°C).

How much does it rain in Ontario in January?

In Ontario, in January, 3.3" (84.1mm) of precipitation is typically accumulated.

What is the average length of the day in January in Ontario?

The average length of the day in January in Ontario, California, is 10.2h.
Average temperature in January - Ontario, CA
  • Average high temperature in January: 65.2°F

The warmest month (with the highest average high temperature) is August (93.6°F).
The month with the lowest average high temperature is January (65.2°F).

  • Average low temperature in January: 43.8°F

The month with the highest average low temperature is August (64.7°F).
The coldest month (with the lowest average low temperature) is December (42.7°F).

Average rainfall in January - Ontario, CA
  • Average rainfall in January: 3.3"

The wettest month (with the highest rainfall) is February (3.4").
Driest months (with the lowest rainfall) are June, July and August (0.1").

Average daylight in January - Ontario, CA
  • Average daylight in January: 10.2h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).