December weather forecast
Iowa City, IA

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Golden and brown trees in a scenic, neat lawn near the mighty grandeur of the Old Capitol building, Iowa City
Golden and brown trees in a scenic, neat lawn near the mighty grandeur of the Old Capitol building, Iowa City

Weather in December

December ushers in the winter season, with temperatures dipping well below freezing, particularly at night, reaching lows of 22.8°F (-5.1°C). Snowfall becomes frequent, contributing to a thick white blanket enveloping the city. Cold winds carry the unmistakable scent of the approaching holidays, completing the quintessential winter scene.

Temperature

Iowa City's December weather shows a moderate shift in high-temperatures, falling from November's chilly 46.4°F (8°C) to a cold 34°F (1.1°C). In Iowa City, December is marked by an average low-temperature of 22.8°F (-5.1°C).

Humidity

In Iowa City, the average relative humidity in December is 80%.

Rainfall

In Iowa City, Iowa, in December, it is raining for 7 days, with typically 1.46" (37mm) of accumulated precipitation. Throughout the year, there are 140.4 rainfall days, and 29.57" (751mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. In Iowa City, Iowa, in December, during 8.4 snowfall days, 2.28" (58mm) of snow is typically accumulated. Throughout the year, in Iowa City, there are 37.7 snowfall days, and 16.42" (417mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Iowa City, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 7:14 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:45 pm CST.

Sunshine

In December, the average sunshine is 4.4h.

UV index

In Iowa City, Iowa, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.
Note: In December, an average UV index of 2 transforms into the following instructions:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

How cold is it in Iowa City in December?

An average high-temperature, in December, in Iowa City, is 34°F (1.1°C) and the average low-temperature is 22.8°F (-5.1°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is estimated at 86°F (30°C).

What is the average humidity in December in Iowa City?

In December, the average relative humidity in Iowa City, Iowa, is 80%.

How many days does it rain in December in Iowa City?

In Iowa City, Iowa, during December, the rain falls for 7 days and regularly aggregates up to 1.46" (37mm) of precipitation.

How many days does it snow in December in Iowa City?

In December, in Iowa City, it is snowing for 8.4 days. Throughout December, 2.28" (58mm) of snow is accumulated.

What is the month with the shortest days in Iowa City?

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

How many hours of daylight does Iowa City have in December?

The average day length in December in Iowa City is 9h and 13min.

When is the sunrise / sunset in December in Iowa City?

On the first day of December in Iowa City, sunrise is at 7:14 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:45 pm CST.

How long on average sun shines in December in Iowa City?

In December, the average sunshine duration is 4.4h.

How high is the UV index in December in Iowa City?

The average daily maximum UV index in December in Iowa City, Iowa, is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to 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
Iowa City, IA

Average temperature in December - Iowa City, IA
  • Average high temperature in December: 34°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in December: 22.8°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 (15.3°F).

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Average pressure in December
Iowa City, IA

Average pressure in December - Iowa City, 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
Iowa City, IA

Average wind speed in December - Iowa City, IA
  • Average wind speed in December: 9.9mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

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Average humidity in December
Iowa City, IA

Average humidity in December - Iowa City, IA
  • Average humidity in December: 80%

The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in December
Iowa City, IA

Average rainfall in December - Iowa City, IA
  • Average rainfall in December: 1.46"

The wettest month (with the highest rainfall) is May (4.69").
The driest months (with the least rainfall) are January and February (1.34").

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Average rainfall days in December
Iowa City, IA

Average rainfall days in December - Iowa City, IA
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5 days).

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Average snowfall in December
Iowa City, IA

Average snowfall in December - Iowa City, IA
  • Average snowfall in December: 2.28"

The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Iowa City, IA

Average snowfall days in December - Iowa City, IA
  • Average snowfall days in December: 8.4 days

The month with the highest number of snowfall days is January (10.9 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
Iowa City, IA

Average daylight in December / Average sunshine in December - Iowa City, 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 12min).

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Average sunshine days in December
Iowa City, IA

Average sunshine days in December - Iowa City, IA
  • Average sunshine days in December: 17 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10 days).

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Average UV index in December
Iowa City, IA

Average UV index in December - Iowa City, IA
  • Average UV index in December: 2

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

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Average cloud cover in December
Iowa City, IA

Average cloud cover in December - Iowa City, IA
  • Average cloud cover in December: 53

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in December
Iowa City, IA

Average visibility in December - Iowa City, 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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Iowa City, Iowa, USA

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