December weather forecast and climate
Fort Atkinson, IA

Weather in December

December, the first month of the winter, in Fort Atkinson, is still a freezing cold month, with average temperature ranging between min 18.3°F (-7.6°C) and max 28.4°F (-2°C).

Temperature

In December, the average high-temperature drops, from a wintry 41.9°F (5.5°C) in November, to a subzero cold 28.4°F (-2°C). In December, in Fort Atkinson, the average low-temperature is 18.3°F (-7.6°C).

Humidity

The average relative humidity in Fort Atkinson is 86%.

Rainfall

In Fort Atkinson, in December, during 6.4 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. In Fort Atkinson, during the entire year, the rain falls for 149 days and collects up to 30.59" (777mm) of precipitation.

Snowfall

Months with snowfall in Fort Atkinson are January through May, October through December. In December, in Fort Atkinson, it is snowing for 13.1 days. Throughout December, 4.57" (116mm) of snow is accumulated. In Fort Atkinson, during the entire year, snow falls for 60.9 days, and aggregates up to 24.37" (619mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h of daylight.

Sunshine

In Fort Atkinson, Iowa, the average sunshine in December is 3.9h.

UV index

Months with the lowest UV index in Fort Atkinson are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 1 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Fort Atkinson?

In December, the average relative humidity in Fort Atkinson, Iowa, is 86%.

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

In Fort Atkinson, in December, it is raining for 6.4 days, with typically 1.65" (42mm) of accumulated precipitation.

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

In Fort Atkinson, in December, during 13.1 snowfall days, 4.57" (116mm) of snow is typically accumulated.

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

The month with the shortest days in Fort Atkinson, Iowa, is December, with an average of 9h of daylight.

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

In December, the average length of the day in Fort Atkinson is 9h.

How long on average sun shines in December in Fort Atkinson?

In Fort Atkinson, Iowa, the average sunshine in December is 3.9h.

What is the month with the lowest UV index in Fort Atkinson?

Months with the lowest UV index in Fort Atkinson, Iowa, are January, February, November and December, with an average maximum UV index of 1.

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 of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Fort Atkinson, IA

Average temperature in December - Fort Atkinson, IA
  • Average high temperature in December: -2°C

The warmest month (with the highest average high temperature) is July (25.8°C).
The month with the lowest average high temperature is January (-5.4°C).

  • Average low temperature in December: -7.6°C

The month with the highest average low temperature is July (16.6°C).
The coldest month (with the lowest average low temperature) is January (-12.4°C).

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Average pressure in December
Fort Atkinson, IA

Average pressure in December - Fort Atkinson, IA
  • Average pressure in December: 1019.4mbar

The month with the highest atmospheric pressure is January (1020.4mbar).
The month with the lowest atmospheric pressure is June (1012.2mbar).

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Average wind speed in December
Fort Atkinson, IA

Average wind speed in December - Fort Atkinson, IA
  • Average wind speed in December: 15.6km/h

The windiest month (with the highest average wind speed) is April (16.7km/h).
The calmest month (with the lowest average wind speed) is August (11.3km/h).

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Average humidity in December
Fort Atkinson, IA

Average humidity in December - Fort Atkinson, IA
  • Average humidity in December: 86%

Months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is October (76%).

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Average rainfall in December
Fort Atkinson, IA

Average rainfall in December - Fort Atkinson, IA
  • Average rainfall in December: 42mm

The wettest month (with the highest rainfall) is June (128mm).
The driest month (with the least rainfall) is January (28mm).

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Average rainfall days in December
Fort Atkinson, IA

Average rainfall days in December - Fort Atkinson, IA
  • Average rainfall days in December: 6.4 days

Months with the highest number of rainy days are May and June (20.3 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in December
Fort Atkinson, IA

Average snowfall in December - Fort Atkinson, IA
  • Average snowfall in December: 116mm

The month with the highest snowfall is February (152mm).
Months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in December
Fort Atkinson, IA

Average snowfall days in December - Fort Atkinson, IA
  • Average snowfall days in December: 13.1 days

The month with the highest number of snowfall days is January (14.3 days).
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, IA

Average daylight in December / Average sunshine in December - Fort Atkinson, IA
  • Average daylight in December: 9h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in December: 3.9h

The month with the most sunshine is August (Average sunshine: 9.8h).
The month with the least sunshine is January (Average sunshine: 3.5h).

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Average sunshine days in December
Fort Atkinson, IA

Average sunshine days in December - Fort Atkinson, IA
  • Average sunshine days in December: 14.5 days

The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is June (7.1 days).

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Average UV index in December
Fort Atkinson, IA

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

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

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Average cloud cover in December
Fort Atkinson, IA

Average cloud cover in December - Fort Atkinson, IA
  • Average cloud cover in December: 60

The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in December
Fort Atkinson, IA

Average visibility in December - Fort Atkinson, IA
  • Average visibility in December: 8km

Months with the highest visibility are March, April, May, June, August, September, October and November (9km).
Months with the lowest visibility are January, February, July and December (8km).

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