December Weather in Austin, United States

Last updated: June 24, 2025

In Austin, United States during December, the average temperature hovers around -4°C (25°F). Expect chilly conditions, with minimums plummeting to -24°C (-11°F) and occasional maximums reaching up to 19°C (66°F). This month also sees an average precipitation of 37 mm (1.5 in) spread across about 6 days, coupled with a crisp average humidity of 83%.

December Temperature in Austin

In December in Austin, the average temperature is -4°C (25°F), with maximums reaching 19°C (66°F) and minimums plunging as low as -24°C (-11°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to ensure comfort during their visit.

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

The chart illustrates December temperature patterns in Austin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Austin, December typically has an average temperature of -4°C (25°F), with highs reaching up to 19°C (66°F) and lows dropping to around -24°C (-11°F).

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

December Precipitation in Austin

In Austin in December, the precipitation amount is 37 mm (1.5 in) over the course of 6 days.

December Precipitation Trends in Austin

The chart displays monthly precipitation patterns in Austin, 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 Austin, December typically receives around 37 mm (1.5 inches) of precipitation spread over approximately 6 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 Austin

In Austin in December, humidity is 83%. With an average temperature of -4°C (25°F), this humidity feels like a chilling fog enveloping you, making every breath feel heavy and damp, which can quickly dampen the spirit of travel as you navigate the frosty landscape.

December Average Humidity in Austin

This chart illustrates the average monthly humidity levels in Austin, 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 Austin is approximately 83%, 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 Austin

In Austin in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Austin, you can check the information here.

Maximum UV Index Levels in Austin for December

The chart shows the monthly maximum UV Index (UVI) for Austin 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 Austin typically reaches 3, which falls under the moderate exposure category.

Data source: Austin 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 Austin Compares to Other Months

Weather in Austin varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Austin, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Austin, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (17°F)	36 mm (1.4 inches)	82%	moderate
February Weather	-9°C (17°F)	46 mm (1.8 inches)	84%	moderate
March Weather	1°C (34°F)	67 mm (2.6 inches)	80%	moderate
April Weather	7°C (44°F)	85 mm (3.3 inches)	81%	very high
May Weather	15°C (59°F)	148 mm (5.8 inches)	74%	very high
June Weather	22°C (71°F)	134 mm (5.3 inches)	80%	very high
July Weather	23°C (73°F)	98 mm (3.9 inches)	80%	very high
August Weather	21°C (70°F)	107 mm (4.2 inches)	77%	very high
September Weather	18°C (64°F)	121 mm (4.8 inches)	75%	very high
October Weather	9°C (49°F)	104 mm (4.1 inches)	80%	moderate
November Weather	1°C (34°F)	45 mm (1.8 inches)	87%	moderate
December Weather	-4°C (25°F)	37 mm (1.5 inches)	83%	moderate