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

December weather forecast and climate
Des Moines, IA

A close view of city buildings in Des Moines, Iowa
A close view of city buildings in Des Moines, Iowa
December, the first month of the winter, in Des Moines, is still a cold month, with average temperature varying between 34°F (1.1°C) and 18°F (-7.8°C).

Temperature

In Des Moines, the average high-temperature drops, from a chilly 47.8°F (8.8°C) in November, to a wintry 34°F (1.1°C). In December, the average low-temperature is 18°F (-7.8°C).

Humidity

With an average relative humidity of 74.6%, December is the most humid month in Des Moines.

Rainfall

In December, the rain falls for 8.4 days. Throughout December, 1.4" (36.1mm) of precipitation is accumulated. Throughout the year, there are 113.4 rainfall days, and 36" (914.9mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall in Des Moines. The month with the most snowfall is December when snow falls for 6.2 days and typically aggregates up to 9" (228.6mm) of snow.

Daylight

With an average of 9.2h of daylight, December has the shortest days of the year in Des Moines.

Sunshine

December has the least sunshine of the year in Des Moines, with an average of 4.2h of sunshine.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 1 in December interpret into the following advice:
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 solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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, Iowa, in December, the average high-temperature is 34°F (1.1°C), and the average low-temperature is 18°F (-7.8°C).

What is the most humid month in Des Moines?

With an average relative humidity of 74.6%, December is the most humid month.

What is the average humidity in December in Des Moines?

In Des Moines, Iowa, the average relative humidity in December is 74.6%.

How much does it rain in Des Moines in December?

In Des Moines, in December, during 8.4 rainfall days, 1.4" (36.1mm) of precipitation is typically accumulated.

How much does it snow in Des Moines in December?

In Des Moines, Iowa, during December, snow falls for 6.2 days and regularly aggregates up to 9" (228.6mm) of snow.

When does it snow the most in Des Moines?

December is the month with the most snowfall in Des Moines. Snow falls for 6.2 days and accumulates 9" (228.6mm) of snow.

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

The month with the shortest days is December, with an average of 9.2h of daylight.

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

In December, the average length of the day in Des Moines is 9.2h.

What is the month with the least sunshine in Des Moines?

With an average of 4.2h of sunshine, December has the least sunshine of the year.

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

In Des Moines, the average sunshine in December is 4.2h.

When is the lowest UV index in Des Moines?

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

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

In Des Moines, Iowa, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in December - Des Moines, IA
  • Average high temperature in December: 34°F

The warmest month (with the highest average high temperature) is July (85.7°F).
The month with the lowest average high temperature is January (31°F).

  • Average low temperature in December: 18°F

The month with the highest average low temperature is July (66.8°F).
The coldest month (with the lowest average low temperature) is January (14.3°F).

Average humidity in December - Des Moines, IA
  • Average humidity in December: 74.6%

The month with the highest relative humidity is December (74.6%).
The month with the lowest relative humidity is May (63%).

Average rainfall in December - Des Moines, IA
  • Average rainfall in December: 1.4"

The wettest month (with the highest rainfall) is June (4.9").
The driest month (with the lowest rainfall) is January (1").

Average rainfall days in December - Des Moines, IA
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is May (12.5 days).
The month with the lowest number of rainy days is January (7.5 days).

Average snowfall in December - Des Moines, IA
  • Average snowfall in December: 9"

The month with the highest snowfall is December (9").
Months with the lowest snowfall are May, June, July, August and September (0").

Average snowfall days in December - Des Moines, IA
  • Average snowfall days in December: 6.2 days

The month with the highest number of snowfall days is January (6.5 days).
Months with the lowest number of snowfall days are May, 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 shortest days is December (Average daylight: 9.2h).

  • Average sunshine in December: 4.2h

The month with most sunshine is July (Average sunshine: 10.9h).
The month with least sunshine is December (Average sunshine: 4.2h).

Average UV index in December - Des Moines, IA
  • Average UV index in December: 1

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).