December Weather in Dallas, United States

Last updated: June 24, 2025

In Dallas, United States, the average temperature in December hovers around 9°C (48°F). Expect a range with minimums plunging to -6°C (21°F) and maximums reaching up to 24°C (75°F). You'll likely encounter 137 mm (5.4 in) of precipitation spread over 12 days, with an average humidity level of 89%, making it a notably damp time of year.

December Temperature in Dallas

In December in Dallas, the average temperature is 9°C (48°F), with maximums reaching 24°C (75°F) and minimums dropping as low as -6°C (21°F). It's advisable to pack layers to comfortably enjoy your travels during this diverse weather.

December Weather in Dallas: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Dallas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dallas, December typically has an average temperature of 9°C (48°F), with highs reaching up to 24°C (75°F) and lows dropping to around -6°C (21°F).

Data source: Temperature data for Dallas generated using information from the Copernicus Climate Change Service.

December Precipitation in Dallas

In Dallas in December, the precipitation amount is 137 mm (5.4 in) that occurs over the course of 12 days.

December Precipitation Trends in Dallas

The chart displays monthly precipitation patterns in Dallas, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Dallas, December typically receives around 137 mm (5.4 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Dallas

In Dallas in December humidity is 89%. With an average temperature of 9°C (48°F), this humidity feels like a chill that lingers in the air, wrapping around you like a damp blanket, making outdoor activities challenging and encouraging a cozy retreat indoors.

December Average Humidity in Dallas

This chart illustrates the average monthly humidity levels in Dallas, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Dallas is approximately 89%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Dallas

In Dallas in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Dallas for better planning.

Maximum UV Index Levels in Dallas for December

The chart shows the monthly maximum UV Index (UVI) for Dallas in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Dallas typically reaches 4, which falls under the moderate exposure category.

Data source: Dallas December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Dallas Compares to Other Months

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.

This table compares monthly weather conditions in Dallas, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	111 mm (4.4 inches)	86%	moderate
February Weather	10°C (51°F)	159 mm (6.3 inches)	84%	high
March Weather	13°C (56°F)	138 mm (5.4 inches)	83%	very high
April Weather	16°C (62°F)	134 mm (5.3 inches)	81%	very high
May Weather	21°C (71°F)	106 mm (4.2 inches)	81%	extreme
June Weather	24°C (76°F)	133 mm (5.3 inches)	81%	extreme
July Weather	26°C (79°F)	123 mm (4.9 inches)	83%	extreme
August Weather	25°C (78°F)	144 mm (5.7 inches)	81%	very high
September Weather	23°C (74°F)	112 mm (4.4 inches)	82%	very high
October Weather	18°C (65°F)	131 mm (5.1 inches)	78%	very high
November Weather	11°C (52°F)	86 mm (3.4 inches)	86%	high
December Weather	9°C (48°F)	137 mm (5.4 inches)	89%	moderate