Last updated: June 24, 2025
In Dallas, United States, the average temperature in December hovers around 5°C (41°F), with a range that dips to a chilly -7°C (20°F) and can rise to a mild 16°C (61°F). Expect approximately 186 mm (7.3 in) of precipitation over about 19 days, contributing to a notably high average humidity of 87%. Prepare for a cool and wet month!
In December in Dallas, the average temperature is 5°C (41°F). Maximum temperatures can reach 16°C (61°F), while the minimum can dip as low as -7°C (20°F). Pack accordingly for your travels, as you may experience both chilly and moderately warm weather during this time.
In Dallas in December, the precipitation amount is 186 mm (7.3 in) over a span of 19 days.
In Dallas in December humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.
In Dallas in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Dallas, you can visit Hourly UV Index in Dallas.
UV Risk Categories
Weather in Dallas varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Dallas, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (42°F) | 165 mm (6.5 inches) | 85% | low |
| February Weather | 5°C (41°F) | 166 mm (6.5 inches) | 84% | moderate |
| March Weather | 7°C (45°F) | 133 mm (5.2 inches) | 85% | moderate |
| April Weather | 10°C (51°F) | 112 mm (4.4 inches) | 83% | high |
| May Weather | 14°C (57°F) | 54 mm (2.1 inches) | 83% | very high |
| June Weather | 17°C (63°F) | 44 mm (1.7 inches) | 83% | very high |
| July Weather | 20°C (68°F) | 4 mm (0.2 inches) | 82% | very high |
| August Weather | 21°C (69°F) | 5 mm (0.2 inches) | 74% | very high |
| September Weather | 17°C (63°F) | 60 mm (2.3 inches) | 71% | high |
| October Weather | 11°C (53°F) | 89 mm (3.5 inches) | 81% | moderate |
| November Weather | 8°C (46°F) | 147 mm (5.8 inches) | 87% | moderate |
| December Weather | 5°C (41°F) | 186 mm (7.3 inches) | 87% | low |