December weather forecast
Merrillan, WI

Weather in December

December, the first month of the winter in Merrillan, is still a freezing cold month, with an average temperature ranging between max 26.4°F (-3.1°C) and min 15.4°F (-9.2°C).

Temperature

In December, the average high-temperature decreases from a wintry 40.6°F (4.8°C) in November to a freezing cold 26.4°F (-3.1°C). In Merrillan, Wisconsin, in December, the average low-temperature is 15.4°F (-9.2°C).

Humidity

The average relative humidity in December is 88%.

Rainfall

In Merrillan, Wisconsin, during December, the rain falls for 4 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, in Merrillan, there are 120.8 rainfall days, and 16.34" (415mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Merrillan, snow falls for 13.4 days, with typically accumulated 2.83" (72mm) of snow. Throughout the year, in Merrillan, there are 62.1 snowfall days, and 13.11" (333mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 8h and 54min of daylight.
On the first day of December, sunrise is at 7:19 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:33 pm CST.

Sunshine

In Merrillan, the average sunshine in December is 3.2h.

UV index

The months with the lowest UV index in Merrillan are January, February, November and December, with an average maximum UV index of 1. A UV Index estimate 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 average maximum UV index of 1 translate 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. 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 average humidity in December in Merrillan?

In Merrillan, the average relative humidity in December is 88%.

How many days does it rain in December in Merrillan?

In Merrillan, Wisconsin, in December, during 4 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.

How much does it snow in Merrillan in December?

In Merrillan, Wisconsin, in December, snow falls for 13.4 days, with typically accumulated 2.83" (72mm) of snow.

What is the month with the shortest days in Merrillan?

December has the shortest days of the year, with an average of 8h and 54min of daylight.

How many hours of daylight does Merrillan have in December?

The average day length in December in Merrillan, Wisconsin, is 8h and 54min.

When are sunrise and sunset in December in Merrillan?

In December, on the first day of the month, sunrise is at 7:19 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:33 pm CST.

How many hours of sunshine does Merrillan have in December?

In December, the average sunshine duration is 3.2h.

When is the lowest UV index in Merrillan?

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

How high is the UV index in December in Merrillan?

The average daily maximum UV index in December in Merrillan is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe 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
Merrillan, WI

Average temperature in December - Merrillan, WI
  • Average high temperature in December: 26.4°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 (20.7°F).

  • Average low temperature in December: 15.4°F

The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (7.3°F).

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Average pressure in December
Merrillan, WI

Average pressure in December - Merrillan, WI
  • Average pressure in December: 30.1"Hg

The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in December
Merrillan, WI

Average wind speed in December - Merrillan, WI
  • Average wind speed in December: 8.6mph

The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).

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Average humidity in December
Merrillan, WI

Average humidity in December - Merrillan, WI
  • Average humidity in December: 88%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is April (77%).

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Average rainfall in December
Merrillan, WI

Average rainfall in December - Merrillan, WI
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is June (2.91").
The driest month (with the least rainfall) is January (0.51").

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Average rainfall days in December
Merrillan, WI

Average rainfall days in December - Merrillan, WI
  • Average rainfall days in December: 4 days

The month with the highest number of rainy days is June (17.1 days).
The month with the least rainy days is February (2.8 days).

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Average snowfall in December
Merrillan, WI

Average snowfall in December - Merrillan, WI
  • Average snowfall in December: 2.83"

The month with the highest snowfall is February (2.99").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Merrillan, WI

Average snowfall days in December - Merrillan, WI
  • Average snowfall days in December: 13.4 days

The month with the highest number of snowfall days is January (15.4 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
Merrillan, WI

Average daylight in December / Average sunshine in December - Merrillan, WI
  • Average daylight in December: 8h and 54min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 3h and 12min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

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Average sunshine days in December
Merrillan, WI

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

The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is June (9.8 days).

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Average UV index in December
Merrillan, WI

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

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

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Average cloud cover in December
Merrillan, WI

Average cloud cover in December - Merrillan, WI
  • Average cloud cover in December: 67

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in December
Merrillan, WI

Average visibility in December - Merrillan, 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).

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