December weather forecast
Fort Atkinson, WI

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Weather in December

Finally, in December, Fort Atkinson embraces winter wholeheartedly again. Snowfall, reaching 3.94" (100mm), replaces the rainfall entirely. The temperature drops significantly from November, with the lowest recorded at 20.7°F (-6.3°C). December brings the year full circle, returning the city to the freezing temperatures similar to January. The weather during December makes Fort Atkinson a winter wonderland, setting an apt weather scene to end the year.

Temperature

The decrease of average high-temperatures is mild in December in Fort Atkinson, Wisconsin, with a decline from a chilly 43.7°F (6.5°C) in November to a subzero cold 31.1°F (-0.5°C). Fort Atkinson observes an average nighttime low-temperature of 20.7°F (-6.3°C) during the month of December.

Humidity

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

Rainfall

In Fort Atkinson, in December, during 6.9 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Fort Atkinson, during the entire year, the rain falls for 149.4 days and collects up to 28.82" (732mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Fort Atkinson, during December, snow falls for 12.6 days and regularly aggregates up to 3.94" (100mm) of snow. Throughout the year, in Fort Atkinson, there are 58 snowfall days, and 21.85" (555mm) of snow is accumulated.

Daylight

The month with the shortest days in Fort Atkinson is December, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 7:07 am and sunset at 4:21 pm. On the last day of December, in Fort Atkinson, sunrise is at 7:26 am and sunset at 4:31 pm CST.

Sunshine

In Fort Atkinson, the average sunshine in December is 3.8h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Fort Atkinson, Wisconsin. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum UV index of 1 in December translates into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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Frequently asked questions

How cold is December in Fort Atkinson?

Fort Atkinson in December has an average high-temperature of 31.1°F (-0.5°C) and an average low-temperature of 20.7°F (-6.3°C).

What is the average humidity in December in Fort Atkinson?

The average relative humidity in December in Fort Atkinson, Wisconsin, is 84%.

How many days does it rain in December in Fort Atkinson?

In Fort Atkinson, Wisconsin, in December, during 6.9 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.

How many days does it snow in December in Fort Atkinson?

In December, in Fort Atkinson, Wisconsin, it is snowing for 12.6 days. Throughout December, 3.94" (100mm) of snow is accumulated.

What is the month with the shortest days in Fort Atkinson?

With an average of 9h and 6min of daylight, December has the shortest days of the year in Fort Atkinson, Wisconsin.

What is the average length of the day in December in Fort Atkinson?

In Fort Atkinson, Wisconsin, the average day length in December is 9h and 5min.

When are sunrise and sunset in December in Fort Atkinson?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:31 pm CST.

How many hours of sunshine does Fort Atkinson have in December?

In Fort Atkinson, the average sunshine duration in December is 3.8h.

When is the lowest UV index in Fort Atkinson?

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

What is the UV index intensity in December in Fort Atkinson?

In December, the average daily maximum UV index in Fort Atkinson is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
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
Fort Atkinson, WI

Average temperature in December - Fort Atkinson, WI
  • Average high temperature in December: 31.1°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in December: 20.7°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (12°F).

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Average pressure in December
Fort Atkinson, WI

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

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

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Average wind speed in December
Fort Atkinson, WI

Average wind speed in December - Fort Atkinson, WI
  • Average wind speed in December: 9.1mph

The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

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Average humidity in December
Fort Atkinson, WI

Average humidity in December - Fort Atkinson, WI
  • Average humidity in December: 84%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in December
Fort Atkinson, WI

Average rainfall in December - Fort Atkinson, WI
  • Average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is June (3.78").
The driest months (with the least rainfall) are January and February (1.42").

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Average rainfall days in December
Fort Atkinson, WI

Average rainfall days in December - Fort Atkinson, WI
  • Average rainfall days in December: 6.9 days

The month with the highest number of rainy days is May (19.6 days).
The month with the least rainy days is February (5 days).

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Average snowfall in December
Fort Atkinson, WI

Average snowfall in December - Fort Atkinson, WI
  • Average snowfall in December: 3.94"

The month with the highest snowfall is February (5.39").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Fort Atkinson, WI

Average snowfall days in December - Fort Atkinson, WI
  • Average snowfall days in December: 12.6 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
Fort Atkinson, WI

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

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 3h and 5min

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 24min).

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Average sunshine days in December
Fort Atkinson, WI

Average sunshine days in December - Fort Atkinson, WI
  • Average sunshine days in December: 14.3 days

The month with the most sunshine days is November (16.1 days).
The months with the least sunshine days are May and June (9.8 days).

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Average UV index in December
Fort Atkinson, WI

Average UV index in December - Fort Atkinson, WI
  • Average UV index in December: 1

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

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Average cloud cover in December
Fort Atkinson, WI

Average cloud cover in December - Fort Atkinson, WI
  • Average cloud cover in December: 61

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 34).

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Average visibility in December
Fort Atkinson, WI

Average visibility in December - Fort Atkinson, 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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Fort Atkinson, Wisconsin, USA

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