December weather forecast
Mountain, WI

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Weather in December

December, the first month of the winter in Mountain, is also a subzero cold month, with temperature in the range of an average high of 27.3°F (-2.6°C) and an average low of 18.5°F (-7.5°C).

Temperature

As November transitions into December, Mountain sees a drop in the average high-temperature, transitioning from an icy 39.6°F (4.2°C) to a subzero cold 27.3°F (-2.6°C). Mountain records a slight downturn to an average 18.5°F (-7.5°C) during the nights of December.

Humidity

In December, the average relative humidity is 85%.

Rainfall

In Mountain, Wisconsin, in December, during 5.3 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In Mountain, during the entire year, the rain falls for 122.9 days and collects up to 21.34" (542mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. The month with the most snowfall is December, when snow falls for 11.8 days and typically aggregates up to 6.06" (154mm) of snow.

Daylight

December has the shortest days of the year, with an average of 8h and 48min of daylight.
On the first day of the month, sunrise is at 7:13 am and sunset at 4:13 pm. On the last day of December, sunrise is at 7:32 am and sunset at 4:21 pm CST.

Sunshine

In Mountain, the average sunshine in December is 3.7h.

UV index

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. When the Sun is at its strongest around midday, find shade and limit exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

In December, the average high-temperature and low-temperature are 27.3°F (-2.6°C) and 18.5°F (-7.5°C) respectively.

What is the average humidity in December?

The average relative humidity in December is 85%.

How much does it rain in December?

In Mountain, Wisconsin, in December, it is raining for 5.3 days, with typically 1.38" (35mm) of accumulated precipitation.

What is the snowiest month?

December is the month with the most snowfall. Snow falls for 11.8 days and accumulates 6.06" (154mm) of snow.

How many days does it snow in December?

In Mountain, in December, snow falls for 11.8 days, with typically accumulated 6.06" (154mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 48min of daylight.

How many hours of daylight does Mountain have in December?

In December, the average day length is 8h and 49min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:13 am and sunset at 4:13 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:21 pm CST.

How many hours of sunshine does Mountain have in December?

The average sunshine duration in December is 3.7h.

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents 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
Mountain, WI

Average temperature in December - Mountain, WI
  • Average high temperature in December: 27.3°F

The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (21.6°F).

  • Average low temperature in December: 18.5°F

The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).

Average pressure in December
Mountain, WI

Average pressure in December - Mountain, WI
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Mountain, WI

Average wind speed in December - Mountain, WI
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is April (8.4mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

Average humidity in December
Mountain, WI

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

The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (73%).

Average rainfall in December
Mountain, WI

Average rainfall in December - Mountain, WI
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is June (2.6").
The driest months (with the least rainfall) are January and February (0.87").

Average rainfall days in December
Mountain, WI

Average rainfall days in December - Mountain, WI
  • Average rainfall days in December: 5.3 days

The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (3.8 days).

Average snowfall in December
Mountain, WI

Average snowfall in December - Mountain, WI
  • Average snowfall in December: 6.06"

The month with the highest snowfall is December (6.06").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Mountain, WI

Average snowfall days in December - Mountain, WI
  • Average snowfall days in December: 11.8 days

The month with the highest number of snowfall days is January (14.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Mountain, WI

Average daylight in December / Average sunshine in December - Mountain, WI
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in December: 3h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 18min).

Average sunshine days in December
Mountain, WI

Average sunshine days in December - Mountain, WI
  • Average sunshine days in December: 16.9 days

The months with the most sunshine days are September and December (16.9 days).
The month with the least sunshine days is April (12.8 days).

Average UV index in December
Mountain, WI

Average UV index in December - Mountain, WI
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, March and November (UV index 1).

Average cloud cover in December
Mountain, WI

Average cloud cover in December - Mountain, WI
  • Average cloud cover in December: 61

The month with the most cloud cover is February (Cloud cover 66).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in December
Mountain, WI

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

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

Mountain, Wisconsin, USA

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