Dallas Weather in December
Winter weather is usually mild at Dallas, Texas. The nights can get crisp during December yet snow is unusual. The days are mainly balmy and sunny.
This page gives detailed information on the typical December temperature, precipitation, sun, humidity, wind and storms for Dallas. The temperature, precipitation and wind speed numbers here are historical averages based on climate data gathered at the Dallas Love Field Airport, located a few miles from downtown Dallas. The rest of the measurements are averages from the nearby Dallas - Fort Worth International Airport.
Temperature
| 59 °F | December average high | 15 °C |
| 40 °F | December average low | 4 °C |
| 15 days | 60 °F max. or more (16 °C) |
| 18 days | 40 °F min. or less (4 °C) |
Nearly every December day warms to over 40 degrees Fahrenheit (4 degrees Celsius) in Dallas. The city averages six days this month when the thermometer reaches into the 70s °F (over 21 °C). In some Decembers, the temperature pops into the 80s F (above 27 °C).
The thermometer dips to freezing on an average of 7 nights. Although rare, a night in December can drop to 20 °F (-8 °C).
Precipitation
| 3.2 in | total precipitation | 82 mm |
| 7 days | of rain |
Half the time, Dallas receives 1.7 to 4.4 inches (43 to 111 mm) of rainfall in December. One in four years has drier weather, while another one in four is wetter. Although snow is possible now, in most years December is free of snow.
Sun
| 52 % | sunshine |
| 11 days | clear skies |
December is one of the cloudiest months for Dallas. The sun's rays reach the ground during 52 percent of daylight hours on average, for a total of 162 hours in the month. Typically on 11 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in December at Dallas averages 10 hours and 1 minutes a day. The shortest days of the year, December 21st and 22nd, last 9 hours and 59 minutes from sunrise to sunset.
Humidity
| 68 % | December average humidity |
The relative humidity in Dallas during December usually peaks at 79 percent in the morning then drops to 51 percent by mid afternoon.
| Local Time | 12 am | 3 am | 6 am | 9 am | 12 pm | 3 pm | 6 pm | 9 pm |
| Humidity % | 73 | 77 | 79 | 76 | 59 | 51 | 59 | 68 |
Wind
| 9.2 mph | December wind speed average | 14.8 kph |
December is an average month for wind at Dallas.
Storms
| 2 days | rainfall of 0.5 inches (13 mm) or more |
| 1 day | with thunderstorms in December |
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.