December weather forecast
Sac City, IA

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Weather in December

December, the first month of the winter in Sac City, is also a subzero cold month, with an average temperature fluctuating between 30.2°F (-1°C) and 20.1°F (-6.6°C).

Temperature

December signals a clear temperature drop, with average high-temperatures decreasing from November's frosty 44.8°F (7.1°C) to a freezing cold 30.2°F (-1°C). Sac City experiences an average nighttime temperature of 20.1°F (-6.6°C) in the month of December.

Humidity

In December, the average relative humidity is 81%.

Rainfall

In Sac City, during December, the rain falls for 4 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Sac City, during the entire year, the rain falls for 107.9 days and collects up to 15.04" (382mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 7.6 days. Throughout December, 1.02" (26mm) of snow is accumulated. Throughout the year, there are 35.1 snowfall days, and 7.99" (203mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 7:30 am and sunset at 4:48 pm. On the last day of December, in Sac City, sunrise is at 7:49 am and sunset at 4:57 pm CST.

Sunshine

The average sunshine in December is 4.7h.

UV index

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In December, a daily maximum UV index of 2 leads to the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

The average high-temperature and low-temperature during December are 30.2°F (-1°C) and 20.1°F (-6.6°C) respectively. In July, the average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 81%.

How much does it rain in December?

In Sac City, in December, it is raining for 4 days, with typically 0.67" (17mm) of accumulated precipitation.

How much does it snow in December?

In December, it is snowing for 7.6 days. Throughout December, 1.02" (26mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 8min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:30 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:57 pm CST.

How many hours of sunshine does Sac City have in December?

The average sunshine duration in December is 4.7h.

How high is the UV index in December?

In Sac City, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from 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
Sac City, IA

Average temperature in December - Sac City, IA
  • Average high temperature in December: 30.2°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (25.2°F).

  • Average low temperature in December: 20.1°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).

Average pressure in December
Sac City, IA

Average pressure in December - Sac City, IA
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Sac City, IA

Average wind speed in December - Sac City, IA
  • Average wind speed in December: 10.7mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).

Average humidity in December
Sac City, IA

Average humidity in December - Sac City, IA
  • Average humidity in December: 81%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is April (67%).

Average rainfall in December
Sac City, IA

Average rainfall in December - Sac City, IA
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is January (0.43").

Average rainfall days in December
Sac City, IA

Average rainfall days in December - Sac City, IA
  • Average rainfall days in December: 4 days

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is February (2.5 days).

Average snowfall in December
Sac City, IA

Average snowfall in December - Sac City, IA
  • Average snowfall in December: 1.02"

The month with the highest snowfall is February (2.68").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Sac City, IA

Average snowfall days in December - Sac City, IA
  • Average snowfall days in December: 7.6 days

The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Sac City, IA

Average daylight in December / Average sunshine in December - Sac 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 6min).

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

Average sunshine days in December
Sac City, IA

Average sunshine days in December - Sac City, IA
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (12 days).

Average UV index in December
Sac City, IA

Average UV index in December - Sac 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 February (UV index 1).

Average cloud cover in December
Sac City, IA

Average cloud cover in December - Sac City, IA
  • Average cloud cover in December: 51

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

Average visibility in December
Sac City, IA

Average visibility in December - Sac City, IA
  • Average visibility in December: 6mi

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

Sac City, Iowa, USA

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