December weather forecast
Mercer, WI

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Weather in December

December, the first month of the winter in Mercer, is also a subzero cold month, with temperature in the range of an average high of 23.7°F (-4.6°C) and an average low of 14.4°F (-9.8°C).

Temperature

Mercer's transition into December involves a shift in temperature, receding from a cold 36°F (2.2°C) in November to a subzero cold 23.7°F (-4.6°C). During December, the average low-temperature is recorded at 14.4°F (-9.8°C).

Humidity

The average relative humidity in December is 91%.

Rainfall

In Mercer, in December, during 4.3 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. In Mercer, during the entire year, the rain falls for 126.3 days and collects up to 24.09" (612mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. December is the month with the most snowfall in Mercer. Snow falls for 23.5 days and accumulates 10.75" (273mm) of snow.

Daylight

The month with the shortest days in Mercer is December, with an average of 8h and 42min of daylight.
On the first day of the month, sunrise is at 7:23 am and sunset at 4:16 pm. On the last day of December, sunrise is at 7:42 am and sunset at 4:24 pm CST.

Sunshine

In Mercer, the average sunshine in December is 2.2h.

UV index

The months with the lowest UV index in Mercer are January through March, 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 rays for ordinary individuals.
Note: In December, the maximum UV index of 1 suggests these recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Boost your sun resistance with garments that are densely woven yet spacious. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
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Frequently asked questions

How cold is it in Mercer in December?

An average high-temperature, in December, in Mercer, is 23.7°F (-4.6°C) and the average low-temperature is 14.4°F (-9.8°C).

What is the average humidity in December in Mercer?

In Mercer, Wisconsin, the average relative humidity in December is 91%.

How many days does it rain in December in Mercer?

In Mercer, Wisconsin, in December, it is raining for 4.3 days, with typically 1.65" (42mm) of accumulated precipitation.

When does it snow the most in Mercer?

The month with the most snowfall is December, when snow falls for 23.5 days and typically aggregates up to 10.75" (273mm) of snow.

How many days does it snow in December in Mercer?

In Mercer, Wisconsin, in December, snow falls for 23.5 days, with typically accumulated 10.75" (273mm) of snow.

What is the month with the shortest days in Mercer?

December has the shortest days of the year in Mercer, Wisconsin, with an average of 8h and 42min of daylight.

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

In December, the average day length is 8h and 41min.

When are sunrise and sunset in December in Mercer?

On the first day of December in Mercer, sunrise is at 7:23 am and sunset at 4:16 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 4:24 pm CST.

How many hours of sunshine does Mercer have in December?

The average sunshine duration in December is 2.2h.

When is the lowest UV index in Mercer?

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

How high is the UV index in December in Mercer?

In Mercer, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes 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
Mercer, WI

Average temperature in December - Mercer, WI
  • Average high temperature in December: 23.7°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (18.3°F).

  • Average low temperature in December: 14.4°F

The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (7°F).

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Average pressure in December
Mercer, WI

Average pressure in December - Mercer, WI
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in December
Mercer, WI

Average wind speed in December - Mercer, WI
  • Average wind speed in December: 8.4mph

The windiest month (with the highest average wind speed) is November (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).

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Average humidity in December
Mercer, WI

Average humidity in December - Mercer, WI
  • Average humidity in December: 91%

The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is May (71%).

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Average rainfall in December
Mercer, WI

Average rainfall in December - Mercer, WI
  • Average rainfall in December: 1.65"

The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (1.26").

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Average rainfall days in December
Mercer, WI

Average rainfall days in December - Mercer, WI
  • Average rainfall days in December: 4.3 days

The months with the highest number of rainy days are May and June (16 days).
The month with the least rainy days is January (3 days).

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Average snowfall in December
Mercer, WI

Average snowfall in December - Mercer, WI
  • Average snowfall in December: 10.75"

The month with the highest snowfall is December (10.75").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Mercer, WI

Average snowfall days in December - Mercer, WI
  • Average snowfall days in December: 23.5 days

The month with the highest number of snowfall days is January (25.6 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
Mercer, WI

Average daylight in December / Average sunshine in December - Mercer, WI
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in December: 2h and 1min

The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 1h and 54min).

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Average sunshine days in December
Mercer, WI

Average sunshine days in December - Mercer, WI
  • Average sunshine days in December: 7.2 days

The month with the most sunshine days is August (14.3 days).
The month with the least sunshine days is January (6.3 days).

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Average UV index in December
Mercer, WI

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

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

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Average cloud cover in December
Mercer, WI

Average cloud cover in December - Mercer, WI
  • Average cloud cover in December: 79

The month with the most cloud cover is January (Cloud cover 82).
The month with the least cloud cover is July (Cloud cover 37).

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Average visibility in December
Mercer, WI

Average visibility in December - Mercer, WI
  • Average visibility in December: 4mi

The months with the highest visibility are May and June (6mi).
The months with the lowest visibility are January, February and December (4mi).

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Mercer, Wisconsin, USA

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