December weather forecast
Cedar Rapids, IA

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Nice aerial capture of the skyline over Cedar Rapids in Iowa
Nice aerial capture of the skyline over Cedar Rapids in Iowa

Weather in December

December marks the peak of winter intensity in Cedar Rapids, with the lowest amount of daily sunlight at just 9.2 hours. The relative lack of sunshine aligns with all the characteristics of Cedar Rapids’ winter, primarily characterized by 1.46" (37mm) of snowfall. As the temperatures continue to plunge, residents are advised to bundle up and brace for the winter chill. The slight rise in pressure augments the overall cold sensation. While December's constant wind speed and high humidity further intensify the winter feel.

Temperature

The shift from November to December involves a decrease in the average high-temperature, dropping from a chilly 45.5°F (7.5°C) to a cold 33.1°F (0.6°C). The nighttime temperature, during December, averages of 22.5°F (-5.3°C).

Humidity

The average relative humidity in December in Cedar Rapids is 81%.

Rainfall

In Cedar Rapids, in December, during 5.9 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Cedar Rapids, during the entire year, the rain falls for 120.7 days and collects up to 18.31" (465mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Cedar Rapids, during December, snow falls for 8.2 days and regularly aggregates up to 1.46" (37mm) of snow. Throughout the year, there are 36.1 snowfall days, and 8.43" (214mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 7:15 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:45 pm CST.

Sunshine

In December, the average sunshine is 4.4h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum UV index of 1 in December translates into the following recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

How cold is December in Cedar Rapids?

Cedar Rapids in December has an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 22.5°F (-5.3°C). In July, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 86°F (30°C).

What is the average humidity in December in Cedar Rapids?

In Cedar Rapids, Iowa, the average relative humidity in December is 81%.

How many days does it rain in December in Cedar Rapids?

In Cedar Rapids, Iowa, in December, during 5.9 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.

How many days does it snow in December in Cedar Rapids?

In Cedar Rapids, Iowa, in December, during 8.2 snowfall days, 1.46" (37mm) of snow is typically accumulated.

What is the month with the shortest days in Cedar Rapids?

December has the shortest days of the year, with an average of 9h and 12min of daylight.

What is the average length of the day in December in Cedar Rapids?

In Cedar Rapids, the average day length in December is 9h and 11min.

When is the sunrise / sunset in December in Cedar Rapids?

In December, on the first day of the month, sunrise is at 7:15 am and sunset at 4:36 pm. On the last day of the month, in Cedar Rapids, sunrise is at 7:34 am and sunset at 4:45 pm CST.

How many hours of sunshine does Cedar Rapids have in December?

In Cedar Rapids, Iowa, the average sunshine duration in December is 4.4h.

When is the lowest UV index in Cedar Rapids?

The months with the lowest UV index in Cedar Rapids, Iowa, are January and December, with an average maximum UV index of 1.

How high is the UV index in December in Cedar Rapids?

The average daily maximum UV index in December in Cedar Rapids, Iowa, is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
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
Cedar Rapids, IA

Average temperature in December - Cedar Rapids, IA
  • Average high temperature in December: 33.1°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (26.2°F).

  • Average low temperature in December: 22.5°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).

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Average pressure in December
Cedar Rapids, IA

Average pressure in December - Cedar Rapids, IA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in December
Cedar Rapids, IA

Average wind speed in December - Cedar Rapids, IA
  • Average wind speed in December: 10.1mph

The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

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Average humidity in December
Cedar Rapids, IA

Average humidity in December - Cedar Rapids, IA
  • Average humidity in December: 81%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in December
Cedar Rapids, IA

Average rainfall in December - Cedar Rapids, IA
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is May (3.07").
The driest months (with the least rainfall) are January and February (0.63").

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Average rainfall days in December
Cedar Rapids, IA

Average rainfall days in December - Cedar Rapids, IA
  • Average rainfall days in December: 5.9 days

The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is February (3 days).

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Average snowfall in December
Cedar Rapids, IA

Average snowfall in December - Cedar Rapids, IA
  • Average snowfall in December: 1.46"

The month with the highest snowfall is January (2.64").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Cedar Rapids, IA

Average snowfall days in December - Cedar Rapids, IA
  • Average snowfall days in December: 8.2 days

The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Cedar Rapids, IA

Average daylight in December / Average sunshine in December - Cedar Rapids, IA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 4h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in December
Cedar Rapids, IA

Average sunshine days in December - Cedar Rapids, IA
  • Average sunshine days in December: 18.6 days

The month with the most sunshine days is October (19.9 days).
The month with the least sunshine days is June (11.8 days).

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Average UV index in December
Cedar Rapids, IA

Average UV index in December - Cedar Rapids, IA
  • Average UV index in December: 1

The months with the highest UV index are June and July (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
Cedar Rapids, IA

Average cloud cover in December - Cedar Rapids, IA
  • Average cloud cover in December: 54

The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 30).

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Average visibility in December
Cedar Rapids, IA

Average visibility in December - Cedar Rapids, IA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).

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Cedar Rapids, Iowa, USA

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