December weather - Winter 2024

Weather in December
Frequently asked questions
Average temperature in December
Average pressure in December
Average wind speed in December
Average humidity in December
Average rainfall in December
Average rainfall days in December
Average snowfall in December
Average snowfall days in December
Average daylight in December
Average sunshine in December
Average sunshine days in December
Average UV index in December
Average cloud cover in December
Average visibility in December

The Sioux Falls in South Dakota, flowing downstream over rocks under the perfect evening skyline

Weather in December

December ushers Sioux Falls into the full swing of the winter season. As the frosty chill blankets the city, it harkens back to the conditions prevalent in the first month of the year. Snowfall rises again to 3.23" (82mm), reinstating Sioux Falls' crystal-edged picturesque winterscape. The reducing daylight hours keep the city gripped in winter's cold, but beautiful, embrace. In essence, December wraps up the year in Sioux Falls on a chilly but charming note.

Temperature

A clear reduction in the average high-temperature is witnessed with the onset of December, reducing from a frosty 43.2°F (6.2°C) in November to a freezing cold 27.5°F (-2.5°C). In the month of December, an average of 15.6°F (-9.1°C) marks the low-temperature.

Humidity

In December, the average relative humidity in Sioux Falls is 84%.

Rainfall

In Sioux Falls, in December, it is raining for 4.5 days, with typically 1.02" (26mm) of accumulated precipitation. In Sioux Falls, during the entire year, the rain falls for 117.1 days and collects up to 20.71" (526mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In December, in Sioux Falls, it is snowing for 10.8 days. Throughout December, 3.23" (82mm) of snow is accumulated. In Sioux Falls, during the entire year, snow falls for 48.7 days and aggregates up to 18.23" (463mm) of snow.

Daylight

With an average of 9h and 0min of daylight, December has the shortest days of the year.
On the first day of December in Sioux Falls, sunrise is at 7:40 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 5:00 pm CST.

Sunshine

The average sunshine in December is 4.3h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sioux Falls, South Dakota. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.
Note: An average maximum UV index of 2 in December leads to these recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. It's recommended to limit sun exposure when its radiation is at its peak during midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.

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Frequently asked questions

How cold is December in Sioux Falls?

In Sioux Falls, in December, the average high-temperature is 27.5°F (-2.5°C), and the average low-temperature is 15.6°F (-9.1°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in August is computed to be 86°F (30°C).

What is the average humidity in December in Sioux Falls?

In December, the average relative humidity in Sioux Falls, South Dakota, is 84%.

How many days does it rain in December in Sioux Falls?

In Sioux Falls, South Dakota, during December, the rain falls for 4.5 days and regularly aggregates up to 1.02" (26mm) of precipitation.

How many days does it snow in December in Sioux Falls?

In December, in Sioux Falls, it is snowing for 10.8 days. Throughout December, 3.23" (82mm) of snow is accumulated.

What is the month with the shortest days in Sioux Falls?

December has the shortest days of the year in Sioux Falls, South Dakota, with an average of 9h and 0min of daylight.

What is the average length of the day in December in Sioux Falls?

In December, the average day length in Sioux Falls, South Dakota, is 9h and 1min.

When is the sunrise / sunset in December in Sioux Falls?

On the first day of December, sunrise is at 7:40 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 5:00 pm CST.

How long on average sun shines in December in Sioux Falls?

In Sioux Falls, South Dakota, the average sunshine duration in December is 4.3h.

What is the month with the lowest UV index in Sioux Falls?

The months with the lowest UV index in Sioux Falls are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Sioux Falls?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

43.2°F 6.2°C

27.5°F -2.5°C

23.4°F -4.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.2mph 18km/h

10.8mph 17.4km/h

11.1mph 17.9km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

20.6

18.4

18.1

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Sioux Falls, SD

Average high temperature in December: 27.5°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (23.4°F).

Average low temperature in December: 15.6°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).

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Average pressure in December
Sioux Falls, SD

Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in December
Sioux Falls, SD

Average wind speed in December: 10.1mph

The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is July (8mph).

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Average humidity in December
Sioux Falls, SD

Average humidity in December: 84%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (66%).

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Average rainfall in December
Sioux Falls, SD

Average rainfall in December: 1.02"

The wettest month (with the highest rainfall) is June (3.27").
The driest months (with the least rainfall) are January, February and November (0.67").

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Average rainfall days in December
Sioux Falls, SD

Average rainfall days in December: 4.5 days

The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3 days).

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Average snowfall in December
Sioux Falls, SD

Average snowfall in December: 3.23"

The month with the highest snowfall is February (4.25").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Sioux Falls, SD

Average snowfall days in December: 10.8 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Sioux Falls, SD

Average daylight in December: 9h and 0min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

Average sunshine in December: 4h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in December
Sioux Falls, SD

Average sunshine days in December: 18.4 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is June (10 days).

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Average UV index in December
Sioux Falls, SD

Average UV index in December: 2

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Sioux Falls, SD

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 July (Cloud cover 27).

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Average visibility in December
Sioux Falls, SD

Average visibility in December: 6mi

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

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December weather forecast
Sioux Falls, SD

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