December weather forecast
Des Moines, IA

City buildings in Des Moines, Iowa
City buildings in Des Moines, Iowa

Weather in December

The first month of the winter, December, is also a wintry month in Des Moines, Iowa, with temperature in the range of an average low of 22.5°F (-5.3°C) and an average high of 34.2°F (1.2°C).

Temperature

In December, the average high-temperature decreases from a frosty 47.1°F (8.4°C) in November to a cold 34.2°F (1.2°C). In December, the average low-temperature is 22.5°F (-5.3°C).

Humidity

In December, the average relative humidity in Des Moines is 78%.

Rainfall

In December, the rain falls for 4.1 days. Throughout December, 0.55" (14mm) of precipitation is accumulated. Throughout the year, there are 114.4 rainfall days, and 16.38" (416mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Des Moines, in December, during 5.7 snowfall days, 0.91" (23mm) of snow is typically accumulated. Throughout the year, there are 30.9 snowfall days, and 7.36" (187mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 13min of daylight.
On the first day of the month, sunrise is at 7:21 am and sunset at 4:45 pm. On the last day of December, sunrise is at 7:40 am and sunset at 4:53 pm CST.

Sunshine

In December, the average sunshine is 4.7h.

UV index

The average daily maximum UV index in December in Des Moines, Iowa, is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 2 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. 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 temperature in December in Des Moines?

In December, in Des Moines, the average high-temperature is 34.2°F (1.2°C), and the average low-temperature is 22.5°F (-5.3°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is estimated at 87.8°F (31°C).

What is the average humidity in December in Des Moines?

The average relative humidity in December in Des Moines is 78%.

How much does it rain in Des Moines in December?

In December, in Des Moines, the rain falls for 4.1 days. Throughout December, 0.55" (14mm) of precipitation is accumulated.

How many days does it snow in December in Des Moines?

In Des Moines, Iowa, in December, during 5.7 snowfall days, 0.91" (23mm) of snow is typically accumulated.

What is the month with the shortest days in Des Moines?

December has the shortest days of the year in Des Moines, with an average of 9h and 13min of daylight.

What is the average length of the day in December in Des Moines?

In Des Moines, the average day length in December is 9h and 13min.

What time are sunrise and sunset in December in Des Moines?

On the first day of December in Des Moines, Iowa, sunrise is at 7:21 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 4:53 pm CST.

How many hours of sunshine does Des Moines have in December?

The average sunshine duration in December is 4.7h.

How high is the UV index in December in Des Moines?

In Des Moines, Iowa, 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 the Sun's 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
Des Moines, IA

Average temperature in December - Des Moines, IA
  • Average high temperature in December: 34.2°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in December: 22.5°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).

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Average pressure in December
Des Moines, IA

Average pressure in December - Des Moines, IA
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in December
Des Moines, IA

Average wind speed in December - Des Moines, IA
  • Average wind speed in December: 9.9mph

The windiest months (with the highest average wind speed) are January, February, March and April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

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Average humidity in December
Des Moines, IA

Average humidity in December - Des Moines, IA
  • Average humidity in December: 78%

The months with the highest relative humidity are January and June (82%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in December
Des Moines, IA

Average rainfall in December - Des Moines, IA
  • Average rainfall in December: 0.55"

The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in December
Des Moines, IA

Average rainfall days in December - Des Moines, IA
  • Average rainfall days in December: 4.1 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (3 days).

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Average snowfall in December
Des Moines, IA

Average snowfall in December - Des Moines, IA
  • Average snowfall in December: 0.91"

The month with the highest snowfall is January (2.24").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Des Moines, IA

Average snowfall days in December - Des Moines, IA
  • Average snowfall days in December: 5.7 days

The month with the highest number of snowfall days is January (8.7 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
Des Moines, IA

Average daylight in December / Average sunshine in December - Des Moines, IA
  • Average daylight in December: 9h and 13min

The month with the longest days is June (Average daylight: 15h and 8min).
The month with the shortest days is December (Average daylight: 9h and 13min).

  • Average sunshine in December: 4h and 42min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

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Average sunshine days in December
Des Moines, IA

Average sunshine days in December - Des Moines, IA
  • Average sunshine days in December: 22.3 days

The month with the most sunshine days is December (22.3 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in December
Des Moines, IA

Average UV index in December - Des Moines, IA
  • Average UV index in December: 2

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

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Average cloud cover in December
Des Moines, IA

Average cloud cover in December - Des Moines, IA
  • Average cloud cover in December: 50

The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and September (Cloud cover 29).

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Average visibility in December
Des Moines, IA

Average visibility in December - Des Moines, IA
  • Average visibility in December: 6mi

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

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