December weather forecast
Dallas, SD

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Weather in December

December, the first month of the winter in Dallas, is also a subzero cold month, with an average temperature fluctuating between 18.3°F (-7.6°C) and 31.1°F (-0.5°C).

Temperature

Witnessing a clear drop in December, the average high-temperature declines from November's chilly 46.6°F (8.1°C) to a subzero cold 31.1°F (-0.5°C). Throughout December, the temperature tends to fall to a consistent average low of 18.3°F (-7.6°C).

Humidity

The average relative humidity in December is 79%.

Rainfall

In Dallas, in December, it is raining for 3.5 days, with typically 0.79" (20mm) of accumulated precipitation. In Dallas, during the entire year, the rain falls for 103.9 days and collects up to 16.85" (428mm) of precipitation.

Snowfall

Months with snowfall in Dallas are January through May, October through December. The month with the most snowfall is December, when snow falls for 8 days and typically aggregates up to 3.19" (81mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 0min of daylight.
On the first day of the month, sunrise is at 7:51 am and sunset at 5:03 pm. On the last day of December, sunrise is at 8:10 am and sunset at 5:12 pm CST.

Sunshine

In December, the average sunshine is 5.2h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 1 during December translates into the following directions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In Dallas, 31.1°F (-0.5°C) is the average high-temperature and 18.3°F (-7.6°C) is the average low-temperature during December. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is calculated to be 89.6°F (32°C).

What is the average humidity in December?

In Dallas, the average relative humidity in December is 79%.

How many days does it rain in December?

In December, the rain falls for 3.5 days. Throughout December, 0.79" (20mm) of precipitation is accumulated.

When does it snow the most?

The month with the most snowfall is December, when snow falls for 8 days and typically aggregates up to 3.19" (81mm) of snow.

How much does it snow in December?

In Dallas, in December, snow falls for 8 days, with typically accumulated 3.19" (81mm) of snow.

What is the month with the shortest days?

With an average of 9h and 0min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

The average day length in December is 9h and 2min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:51 am and sunset at 5:03 pm. On the last day of the month, sunrise is at 8:10 am and sunset at 5:12 pm CST.

How many hours of sunshine does Dallas have in December?

In December, the average sunshine duration is 5.2h.

What is the month with the lowest UV index?

With an average maximum UV index of 1, December is the month with the lowest UV index.

What is the UV index reading in December?

The average daily maximum UV index in December is 1. A UV Index reading 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
Dallas, SD

Average temperature in December - Dallas, SD
  • Average high temperature in December: 31.1°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in December: 18.3°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).

Average pressure in December
Dallas, SD

Average pressure in December - Dallas, 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 (29.84"Hg).

Average wind speed in December
Dallas, SD

Average wind speed in December - Dallas, SD
  • Average wind speed in December: 10.9mph

The windiest month (with the highest average wind speed) is April (11.9mph).
The calmest month (with the lowest average wind speed) is August (9.8mph).

Average humidity in December
Dallas, SD

Average humidity in December - Dallas, SD
  • Average humidity in December: 79%

The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are August and September (57%).

Average rainfall in December
Dallas, SD

Average rainfall in December - Dallas, SD
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in December
Dallas, SD

Average rainfall days in December - Dallas, SD
  • Average rainfall days in December: 3.5 days

The month with the highest number of rainy days is June (15.3 days).
The months with the least rainy days are January and February (2.7 days).

Average snowfall in December
Dallas, SD

Average snowfall in December - Dallas, SD
  • Average snowfall in December: 3.19"

The month with the highest snowfall is December (3.19").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Dallas, SD

Average snowfall days in December - Dallas, SD
  • Average snowfall days in December: 8 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Dallas, SD

Average daylight in December / Average sunshine in December - Dallas, SD
  • Average daylight in December: 9h and 0min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in December
Dallas, SD

Average sunshine days in December - Dallas, SD
  • Average sunshine days in December: 20.2 days

The month with the most sunshine days is November (20.8 days).
The month with the least sunshine days is June (11.2 days).

Average UV index in December
Dallas, SD

Average UV index in December - Dallas, SD
  • Average UV index in December: 1

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

Average cloud cover in December
Dallas, SD

Average cloud cover in December - Dallas, SD
  • Average cloud cover in December: 44

The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 20).

Average visibility in December
Dallas, SD

Average visibility in December - Dallas, SD
  • 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).

Dallas, South Dakota, USA

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