December weather forecast
Iowa City, IA

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, the first month of the winter in Iowa City, is still a cold month, with temperature in the range of an average low of 22.8°F (-5.1°C) and an average high of 34°F (1.1°C).

Temperature

In Iowa City, the average high-temperature in December decreases from a frosty 46.4°F (8°C) in November to a cold 34°F (1.1°C). In Iowa City, Iowa, in December, the average low-temperature is 22.8°F (-5.1°C).

Humidity

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

Rainfall

In Iowa City, during 7 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Iowa City, during the entire year, the rain falls for 140.4 days and collects up to 29.57" (751mm) of precipitation.

Snowfall

Months with snowfall in Iowa City are January through April, October through December. In December, in Iowa City, it is snowing for 8.4 days. Throughout December, 2.28" (58mm) of snow is 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, with an average of 9h and 13min of daylight.
On the first day of December in Iowa City, sunrise is at 7:13 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

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Iowa City?

The average high-temperature, in December, in Iowa City, Iowa, is 34°F (1.1°C), while the average low-temperature is 22.8°F (-5.1°C). in August, the average heat index (a.k.a. 'real feel', '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?

The average relative humidity in December is 80%.

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

In Iowa City, Iowa, in December, during 7 rainfall days, 1.46" (37mm) of precipitation is typically accumulated.

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

In December, in Iowa City, Iowa, 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, Iowa, with an average of 9h and 13min of daylight.

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

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

When are sunrise and sunset in December in Iowa City?

On the first day of December in Iowa City, Iowa, sunrise is at 7:13 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 many hours of sunshine does Iowa City have in December?

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

What is the UV index reading in December in Iowa City?

In December, the average daily maximum UV index in Iowa City, Iowa, is 2. A UV Index estimate of 2, and below, represents a low health threat 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
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 13min

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

  • Average sunshine in December: 4h and 24min

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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