December weather forecast
Rio, WI

Weather in December

December, the first month of the winter in Rio, is also a subzero cold month, with an average temperature varying between 19.2°F (-7.1°C) and 29.1°F (-1.6°C).

Temperature

In December, the average high-temperature drops from a cold 41.9°F (5.5°C) in November to a subzero cold 29.1°F (-1.6°C). In Rio, the average low-temperature is 19.2°F (-7.1°C).

Humidity

In Rio, the average relative humidity in December is 85%.

Rainfall

In Rio, it is raining for 6.1 days, with typically 1.3" (33mm) of accumulated precipitation. In Rio, during the entire year, the rain falls for 134.5 days and collects up to 26.97" (685mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Rio. In December, in Rio, it is snowing for 11.5 days. Throughout December, 3.31" (84mm) of snow is accumulated. Throughout the year, in Rio, Wisconsin, there are 54.7 snowfall days, and 19.06" (484mm) of snow is accumulated.

Daylight

With an average of 9h and 1min of daylight, December has the shortest days of the year in Rio.
On the first day of December in Rio, sunrise is at 7:10 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:30 pm CST.

Sunshine

In December, the average sunshine is 3.7h.

UV index

The months with the lowest UV index in Rio are January, November and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Rio?

In Rio, in December, the average high-temperature is 29.1°F (-1.6°C), and the average low-temperature is 19.2°F (-7.1°C).

What is the average humidity in December in Rio?

In December, the average relative humidity is 85%.

How many days does it rain in December in Rio?

In Rio, during December, the rain falls for 6.1 days and regularly aggregates up to 1.3" (33mm) of precipitation.

How many days does it snow in December in Rio?

In December, it is snowing for 11.5 days. Throughout December, 3.31" (84mm) of snow is accumulated.

What is the month with the shortest days in Rio?

With an average of 9h and 1min of daylight, December has the shortest days of the year.

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

In December, the average day length is 9h and 1min.

When is the sunrise / sunset in December in Rio?

On the first day of December, sunrise is at 7:10 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:30 pm CST.

How long on average sun shines in December in Rio?

In Rio, Wisconsin, the average sunshine duration in December is 3.7h.

What is the month with the lowest UV index in Rio?

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

How high is the UV index in December in Rio?

In December, the average daily maximum UV index in Rio, Wisconsin, is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
Rio, WI

Average temperature in December - Rio, WI
  • Average high temperature in December: 29.1°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (22.6°F).

  • Average low temperature in December: 19.2°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).

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Average pressure in December
Rio, WI

Average pressure in December - Rio, WI
  • Average pressure in December: 30.09"Hg

The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Rio, WI

Average wind speed in December - Rio, WI
  • Average wind speed in December: 9.2mph

The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

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Average humidity in December
Rio, WI

Average humidity in December - Rio, WI
  • Average humidity in December: 85%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in December
Rio, WI

Average rainfall in December - Rio, WI
  • Average rainfall in December: 1.3"

The wettest month (with the highest rainfall) is June (3.54").
The driest month (with the least rainfall) is February (1.1").

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Average rainfall days in December
Rio, WI

Average rainfall days in December - Rio, WI
  • Average rainfall days in December: 6.1 days

The month with the highest number of rainy days is June (17.2 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall in December
Rio, WI

Average snowfall in December - Rio, WI
  • Average snowfall in December: 3.31"

The month with the highest snowfall is January (5.16").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Rio, WI

Average snowfall days in December - Rio, WI
  • Average snowfall days in December: 11.5 days

The month with the highest number of snowfall days is January (14.4 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
Rio, WI

Average daylight in December / Average sunshine in December - Rio, WI
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 22min).
The month with the shortest days is December (Average daylight: 9h and 1min).

  • Average sunshine in December: 3h and 42min

The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).

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Average sunshine days in December
Rio, WI

Average sunshine days in December - Rio, WI
  • Average sunshine days in December: 16.2 days

The month with the most sunshine days is September (16.5 days).
The month with the least sunshine days is June (10.8 days).

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Average UV index in December
Rio, WI

Average UV index in December - Rio, WI
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in December
Rio, WI

Average cloud cover in December - Rio, WI
  • Average cloud cover in December: 63

The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 34).

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Average visibility in December
Rio, WI

Average visibility in December - Rio, WI
  • Average visibility in December: 5mi

The months with the highest visibility are March, April, May, June, October and November (6mi).
The months with the lowest visibility are January, February, July, August, September and December (5mi).

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