Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
In Ontario, the coldest months are January and December, registering an average high-temperature of 36.1°F (2.3°C).Humidity
In December, the average relative humidity is 78%.Rainfall
December is the month with the most rainfall. Rain falls for 8.9 days and accumulates 1.57" (40mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. The month with the most snowfall in Ontario is December, when snow falls for 7.4 days and typically aggregates up to 5.35" (136mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 8:03 am and sunset at 5:10 pm. On the last day of December, in Ontario, sunrise is at 8:22 am and sunset at 5:19 pm MST.
Sunshine
December has the least sunshine of the year in Ontario, Oregon, with an average of 5.1h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In December, a daily UV index of 2 turns into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Stay sun-safe with clothing that is both closely woven and worn loosely. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Frequently asked questions
What time of the year is the coldest in Ontario?
How cold is December in Ontario?
What is the average humidity in December in Ontario?
What is the wettest month in Ontario?
How many days does it rain in December in Ontario?
When does it snow the most in Ontario?
How many days does it snow in December in Ontario?
What is the month with the shortest days in Ontario?
How many hours of daylight does Ontario have in December?
When is the sunrise / sunset in December in Ontario?
What is the month with the least sunshine in Ontario?
How many hours of sunshine does Ontario have in December?
What is the month with the lowest UV index in Ontario?
What is the UV index intensity in December in Ontario?
Average temperature in December
Ontario, OR
- Average high temperature in December: 36.1°F
The warmest month (with the highest average high temperature) is July (93.2°F).
The months with the lowest average high temperature are January and December (36.1°F).
- Average low temperature in December: 23°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is December (23°F).
Average pressure in December
Ontario, OR
- Average pressure in December: 30.21"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in December
Ontario, OR
- Average wind speed in December: 4.3mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest month (with the lowest average wind speed) is January (3.9mph).
Average humidity in December
Ontario, OR
- Average humidity in December: 78%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (29%).
Average rainfall in December
Ontario, OR
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is December (1.57").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in December
Ontario, OR
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is August (1.8 days).
Average snowfall in December
Ontario, OR
- Average snowfall in December: 5.35"
The month with the highest snowfall is December (5.35").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Ontario, OR
- Average snowfall days in December: 7.4 days
The month with the highest number of snowfall days is December (7.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Ontario, OR
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in December
Ontario, OR
- Average sunshine days in December: 17.3 days
The month with the most sunshine days is July (27.7 days).
The month with the least sunshine days is February (15.2 days).
Average UV index in December
Ontario, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Ontario, OR
- Average cloud cover in December: 44
The months with the most cloud cover are January and December (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in December
Ontario, OR
- Average visibility in December: 5mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Ontario, Oregon, USA
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