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

December weather forecast and climate
Ontario, OR

December, the first month of the winter, in Ontario, is still a cold month, with average temperature ranging between min 19.9°F (-6.7°C) and max 36°F (2.2°C).

Temperature

In Ontario, the average high-temperature in December drops, from a chilly 46.9°F (8.3°C) in November, to a wintry 36°F (2.2°C). In Ontario, Oregon, in December, the average low-temperature is 19.9°F (-6.7°C).

Rainfall

The month with the most rainfall in Ontario is December when 1.4" (35.8mm) of precipitation is typically aggregated.

Snowfall

Months with snowfall in Ontario are January through March, November and December. December is the month with the most snowfall in Ontario, with 5" (127mm) of accumulated snow.

Daylight

December has the shortest days of the year, with an average of 8.9h of daylight.

What is the temperature in December in Ontario?

The average high-temperature, in December, in Ontario, is 36°F (2.2°C), while the average low-temperature is 19.9°F (-6.7°C).

How much does it rain in Ontario in December?

Throughout December, in Ontario, Oregon, 1.4" (35.8mm) of precipitation is accumulated.

What is the wettest month in Ontario?

December is the month with the most rainfall in Ontario, Oregon, with 1.4" (35.8mm) of accumulated precipitation.

How much does it snow in Ontario in December?

Throughout December, 5" (127mm) of snow is accumulated.

What is the snowiest month in Ontario?

The month with the most snowfall in Ontario, Oregon, is December when 5" (127mm) of snow is typically aggregated.

What is the month with the shortest days in Ontario?

The month with the shortest days is December, with an average of 8.9h of daylight.

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

In December, the average length of the day is 8.9h.
Average temperature in December - Ontario, OR
  • Average high temperature in December: 36°F

The warmest month (with the highest average high temperature) is July (93°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in December: 20°F

The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (18°F).

Average rainfall in December - Ontario, OR
  • Average rainfall in December: 1.4"

The wettest month (with the highest rainfall) is December (1.4").
Driest months (with the lowest rainfall) are July and August (0.3").

Average snowfall in December - Ontario, OR
  • Average snowfall in December: 5"

The month with the highest snowfall is December (5").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

Average daylight in December - Ontario, OR
  • Average daylight in December: 8.9h

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 8.9h).