December Weather in Knoxville, United States

Last updated: June 24, 2025

In December, the average temperature in Knoxville, United States hovers around 1°C (33°F). Expect a notable temperature range, with a minimum plummeting to -21°C (-6°F) and a maximum soaring to 21°C (70°F). Rainfall is moderate, with about 50 mm (2.0 in) of precipitation spread over 6 days, contributing to an average humidity of a high 84%.

December Temperature in Knoxville

In December in Knoxville, the average temperature is 1°C (33°F). The maximum can reach 21°C (70°F), while the minimum can plunge as low as -21°C (-6°F). Be prepared for a wide range of temperatures when traveling to Knoxville this month.

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

The chart illustrates December temperature patterns in Knoxville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Knoxville, December typically has an average temperature of 1°C (33°F), with highs reaching up to 21°C (70°F) and lows dropping to around -21°C (-6°F).

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

December Precipitation in Knoxville

In Knoxville in December, the precipitation amount is 50 mm (2.0 in) over the course of 6 days.

December Precipitation Trends in Knoxville

The chart displays monthly precipitation patterns in Knoxville, 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 Knoxville, December typically receives around 50 mm (2.0 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 Knoxville

In Knoxville in December humidity is 84%. With an average temperature of 1°C (33°F), this humidity feels like an icy blanket, making travel uncomfortable and breathless as the frigid air clings to your skin and dampens your clothes.

December Average Humidity in Knoxville

This chart illustrates the average monthly humidity levels in Knoxville, 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 Knoxville is approximately 84%, 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 Knoxville

In Knoxville 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 Knoxville, you can visit Hourly UV Index in Knoxville.

Maximum UV Index Levels in Knoxville for December

The chart shows the monthly maximum UV Index (UVI) for Knoxville 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 Knoxville typically reaches 2, which falls under the low exposure category.

Data source: Knoxville 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 Knoxville Compares to Other Months

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

This table compares monthly weather conditions in Knoxville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (26°F)	57 mm (2.2 inches)	81%	moderate
February Weather	-2°C (28°F)	65 mm (2.6 inches)	81%	moderate
March Weather	5°C (41°F)	105 mm (4.1 inches)	81%	high
April Weather	10°C (50°F)	111 mm (4.4 inches)	82%	very high
May Weather	17°C (63°F)	160 mm (6.3 inches)	78%	very high
June Weather	23°C (74°F)	152 mm (6.0 inches)	81%	extreme
July Weather	25°C (77°F)	108 mm (4.2 inches)	79%	very high
August Weather	23°C (74°F)	67 mm (2.6 inches)	77%	very high
September Weather	20°C (69°F)	99 mm (3.9 inches)	78%	very high
October Weather	13°C (55°F)	126 mm (5.0 inches)	78%	high
November Weather	4°C (40°F)	52 mm (2.1 inches)	87%	moderate
December Weather	1°C (33°F)	50 mm (2.0 inches)	84%	low