December weather forecastDallas, TX
December
Weather in December
December in Dallas hails the arrival of winter, with the coldest temperatures, diminished daylight hours, and minimal rainfall acting as harbingers. December's noticeable weather transition from November shows in decrementing temperatures and increased snowfall. A minute increase in snowfall to 0.08" (2mm) marks the city's final snow layer for the year. With the slow wind speeds and generally stable barometric pressure, a calm ambiance permeates the Dallas air. While the days may be short, the joyous festive season illuminates the city, turning the winter chill into a heartwarming experience.Temperature
Transition from November to December is accompanied by a temperature drop, with average high-temperatures decreasing from a refreshing 64.6°F (18.1°C) to a mild 55.6°F (13.1°C). In Dallas, an average temperature of 41.7°F (5.4°C) is noted during December nights.Humidity
In December, the average relative humidity in Dallas is 68%.Rainfall
In Dallas, in December, during 8.8 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, there are 141.2 rainfall days, and 30.12" (765mm) of precipitation is accumulated.Snowfall
Months with snowfall are January, February, November and December. In December, it is snowing for 0.4 days. Throughout December, 0.08" (2mm) of snow is accumulated. Throughout the year, there are 2.2 snowfall days, and 0.71" (18mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:31 pm CST.
Sunshine
With an average of 5.6h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index in Dallas are January and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The UV index of 3 during December translates into the following guidance:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Dallas, TX
- Average high temperature in December: 55.6°F
The warmest month (with the highest average high temperature) is August (96.1°F).
The month with the lowest average high temperature is January (54.3°F).
- Average low temperature in December: 41.7°F
The month with the highest average low temperature is August (77.2°F).
The coldest month (with the lowest average low temperature) is January (39.2°F).
Average pressure in December
Dallas, TX
- 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 (29.91"Hg).
Average wind speed in December
Dallas, TX
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is September (6.6mph).
Average humidity in December
Dallas, TX
- Average humidity in December: 68%
The month with the highest relative humidity is May (72%).
The month with the lowest relative humidity is August (55%).
Average rainfall in December
Dallas, TX
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is May (4.13").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in December
Dallas, TX
- Average rainfall days in December: 8.8 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (6.7 days).
Average snowfall in December
Dallas, TX
- Average snowfall in December: 0.08"
The month with the highest snowfall is February (0.43").
The months with the least snowfall are March, April, May, June, July, August, September and October (0").
Average snowfall days in December
Dallas, TX
- Average snowfall days in December: 0.4 days
The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Dallas, TX
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 5h and 36min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in December
Dallas, TX
- Average sunshine days in December: 20.4 days
The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is May (12.2 days).
Average UV index in December
Dallas, TX
- Average UV index in December: 3
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in December
Dallas, TX
- Average cloud cover in December: 37
The months with the most cloud cover are February and March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in December
Dallas, TX
- 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).
