December weather forecast
Ontario, OH

Weather in December

The first month of the winter, December, is also a wintry month in Ontario, Ohio, with an average temperature varying between 27.1°F (-2.7°C) and 37.2°F (2.9°C).

Temperature

In December, the average high-temperature drops from a chilly 47.3°F (8.5°C) in November to a wintry 37.2°F (2.9°C). The average low-temperature, in December, is 27.1°F (-2.7°C).

Humidity

In December, the average relative humidity in Ontario is 84%.

Rainfall

In December, the rain falls for 7.6 days. Throughout December, 0.83" (21mm) of precipitation is accumulated. In Ontario, during the entire year, the rain falls for 136.4 days and collects up to 13.15" (334mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In December, in Ontario, it is snowing for 6.7 days. Throughout December, 0.87" (22mm) of snow is accumulated. In Ontario, Ohio, during the entire year, snow falls for 33.8 days and aggregates up to 5.12" (130mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 19min of daylight.
On the first day of December in Ontario, sunrise is at 7:35 am and sunset at 5:03 pm. On the last day of the month, sunrise is at 7:54 am and sunset at 5:12 pm EST.

Sunshine

The average sunshine in December is 3.6h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 1 in December interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Ontario?

In December, the average relative humidity in Ontario is 84%.

How many days does it rain in December in Ontario?

In Ontario, during December, the rain falls for 7.6 days and regularly aggregates up to 0.83" (21mm) of precipitation.

How much does it snow in Ontario in December?

In Ontario, in December, during 6.7 snowfall days, 0.87" (22mm) of snow is typically accumulated.

What is the month with the shortest days in Ontario?

December has the shortest days of the year, with an average of 9h and 19min of daylight.

How many hours of daylight does Ontario have in December?

The average day length in December in Ontario is 9h and 19min.

When are sunrise and sunset in December in Ontario?

On the first day of December in Ontario, Ohio, sunrise is at 7:35 am and sunset at 5:03 pm. On the last day of the month, sunrise is at 7:54 am and sunset at 5:12 pm EST.

How many hours of sunshine does Ontario have in December?

In Ontario, Ohio, the average sunshine duration in December is 3.6h.

When is the lowest UV index in Ontario?

With an average maximum UV index of 1, December is the month with the lowest UV index in Ontario, Ohio.

How high is the UV index in December in Ontario?

In Ontario, the average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Ontario, OH

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).

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Average pressure in December
Ontario, OH

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).

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Average wind speed in December
Ontario, OH

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).

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Average humidity in December
Ontario, OH

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%).

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Average rainfall in December
Ontario, OH

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").

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Average rainfall days in December
Ontario, OH

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).

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Average snowfall in December
Ontario, OH

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").

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Average snowfall days in December
Ontario, OH

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).

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Average daylight in December /
Average sunshine in December
Ontario, OH

Average daylight in December / Average sunshine in December - Ontario, OH
  • Average daylight in December: 9h and 19min

The month with the longest days is June (Average daylight: 15h and 3min).
The month with the shortest days is December (Average daylight: 9h and 19min).

  • Average sunshine in December: 3h and 36min

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).

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Average sunshine days in December
Ontario, OH

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).

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Average UV index in December
Ontario, OH

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).

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Average cloud cover in December
Ontario, OH

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).

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Average visibility in December
Ontario, OH

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).

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