Des Moines
Iowa, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Des Moines, IA

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

Temperature

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

Humidity

The average relative humidity in Des Moines is 78%.

Rainfall

In Des Moines, during December, the rain falls for 4.1 days and regularly aggregates up to 0.55" (14mm) of precipitation. In Des Moines, during the entire year, the rain falls for 114.4 days and collects up to 16.38" (416mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Des Moines, during December, snow falls for 5.7 days and regularly aggregates up to 0.91" (23mm) of snow. 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 in Des Moines, with an average of 9.2h of daylight.

Sunshine

In December, the average sunshine in Des Moines is 4.7h.

UV index

In Des Moines, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 2 in December transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Des Moines?

In Des Moines, in December, the average high-temperature is 34.2°F (1.2°C), and the average low-temperature is 22.5°F (-5.3°C).

What is the average humidity in December in Des Moines?

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

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

In Des Moines, Iowa, in December, it is raining for 4.1 days, with typically 0.55" (14mm) of accumulated precipitation.

How much does it snow in Des Moines in December?

In December, in Des Moines, it is snowing for 5.7 days. Throughout December, 0.91" (23mm) of snow is accumulated.

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

December has the shortest days of the year, with an average of 9.2h of daylight.

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

The average length of the day in December is 9.2h.

How long on average sun shines in December in Des Moines?

The average sunshine in December in Des Moines, Iowa, is 4.7h.

What is the UV index intensity in December in Des Moines?

The average daily maximum UV index in December in Des Moines is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV radiation.
Average temperature in December - Des Moines, IA
  • Average high temperature in December: 1.2°C

The warmest month (with the highest average high temperature) is July (28.4°C).
The month with the lowest average high temperature is January (-2.1°C).

  • Average low temperature in December: -5.3°C

The month with the highest average low temperature is July (18.6°C).
The coldest month (with the lowest average low temperature) is January (-9.4°C).

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

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

Average rainfall in December - Des Moines, IA
  • Average rainfall in December: 14mm

The wettest month (with the highest rainfall) is May (70mm).
The driest month (with the least rainfall) is January (12mm).

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).

Average snowfall in December - Des Moines, IA
  • Average snowfall in December: 23mm

The month with the highest snowfall is January (57mm).
Months with the least snowfall are June, July, August and September (0mm).

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).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Des Moines, IA
  • Average daylight in December: 9.2h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in December: 4.7h

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is January (Average sunshine: 4.3h).

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

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).