December weather forecast and climate
Sioux Falls, SD

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

Weather in December

The first month of the winter, December, is still a freezing cold month in Sioux Falls, South Dakota, with average temperature fluctuating between 15.6°F (-9.1°C) and 27.5°F (-2.5°C).

Temperature

In Sioux Falls, the average high-temperature declines considerably, from a frosty 43.2°F (6.2°C) in November, to a subzero cold 27.5°F (-2.5°C). In December, in Sioux Falls, the average low-temperature is 15.6°F (-9.1°C).

Humidity

The average relative humidity in December is 84%.

Rainfall

In December, in Sioux Falls, the rain falls for 4.5 days. Throughout December, 1.02" (26mm) of precipitation is accumulated. Throughout the year, there are 117.1 rainfall days, and 20.71" (526mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Sioux Falls, during 10.8 snowfall days, 3.23" (82mm) of snow is typically accumulated. Throughout the year, there are 48.7 snowfall days, and 18.23" (463mm) of snow is accumulated.

Daylight

The month with the shortest days in Sioux Falls is December, with an average of 9h of daylight.

Sunshine

In Sioux Falls, South Dakota, 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. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to the UV radiation for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in 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).

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, in December, during 4.5 rainfall days, 1.02" (26mm) of precipitation is typically accumulated.

How much does it snow in Sioux Falls in December?

In Sioux Falls, during December, snow falls for 10.8 days and regularly aggregates up to 3.23" (82mm) of snow.

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

The month with the shortest days in Sioux Falls, South Dakota, is December, with an average of 9h of daylight.

How many hours of daylight does Sioux Falls have in December?

The average length of the day in December is 9h.

How many hours of sunshine does Sioux Falls have in December?

The average sunshine in December in Sioux Falls, South Dakota, is 4.3h.

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

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

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

In Sioux Falls, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.

Average temperature in December
Sioux Falls, SD

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 - Sioux Falls, SD
  • Average pressure in December: 30.13"

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

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Average wind speed in December
Sioux Falls, SD

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 - 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 - 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 - 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 - Sioux Falls, SD
  • Average snowfall in December: 3.23"

The month with the highest snowfall is February (4.25").
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 - 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).
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 / Average sunshine in December - Sioux Falls, SD
  • Average daylight in December: 9h

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in December: 4.3h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 4h).

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Average sunshine days in December
Sioux Falls, SD

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 - Sioux Falls, SD
  • Average UV index in December: 2

Months with the highest UV index are June and July (UV index 6).
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 - 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 - Sioux Falls, SD
  • Average visibility in December: 6mi

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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