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 average high-temperature in December decreases from a frosty 47.3°F (8.5°C) in November to a cold 37.2°F (2.9°C). During December, Ontario observes a consistent average nighttime temperature of 27.1°F (-2.7°C).Humidity
In December, the average relative humidity is 84%.Rainfall
In Ontario, in December, during 7.6 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Ontario, during the entire year, the rain falls for 136.4 days and collects up to 13.15" (334mm) of precipitation.Snowfall
January through April, November and December are months with snowfall in Ontario. In Ontario, in December, snow falls for 6.7 days, with typically accumulated 0.87" (22mm) of snow. Throughout the year, in Ontario, Ohio, there are 33.8 snowfall days, and 5.12" (130mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:35 am and sunset at 5:03 pm. On the last day of December, sunrise is at 7:54 am and sunset at 5:13 pm EST.
Sunshine
In December, the average sunshine is 3.6h.UV index
December is the month with the lowest UV index in Ontario, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 1 in December interprets into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Ontario?
What is the average humidity in December in Ontario?
How much does it rain in Ontario in December?
How many days does it snow in December in Ontario?
What is the month with the shortest days in Ontario?
What is the average length of the day in December in Ontario?
When are sunrise and sunset in December in Ontario?
How long on average sun shines in December in Ontario?
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, OH
- Average high temperature in December: 37.2°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in December: 27.1°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in December
Ontario, OH
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Ontario, OH
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in December
Ontario, OH
- Average humidity in December: 84%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April, October and November (78%).
Average rainfall in December
Ontario, OH
- Average rainfall in December: 0.83"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is February (0.79").
Average rainfall days in December
Ontario, OH
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (6.5 days).
Average snowfall in December
Ontario, OH
- Average snowfall in December: 0.87"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Ontario, OH
- Average snowfall days in December: 6.7 days
The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Ontario, OH
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
Ontario, OH
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in December
Ontario, OH
- Average UV index in December: 1
The months with the highest UV index are June and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Ontario, OH
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Ontario, OH
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, July, August and September (5mi).
Ontario, Ohio, USA
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