December Weather in Knoxville, United States

Last updated: June 24, 2025

In December, the average temperature in Knoxville, United States hovers around 11°C (51°F). Expect temperature fluctuations, with a minimum of -5°C (22°F) and a maximum of 26°C (79°F). Precipitation levels are notable, with 121 mm (4.7 in) of rain expected over 11 days, contributing to a high average humidity of 89%. Stay prepared for a mix of chilly and warmer days!

December Temperature in Knoxville

In December in Knoxville, the average temperature is 11°C (51°F). Maximum temperatures can reach 26°C (79°F), while the minimum can drop as low as -5°C (22°F). Be sure to pack layers to accommodate the wide temperature range during your travels.

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 11°C (51°F), with highs reaching up to 26°C (79°F) and lows dropping to around -5°C (22°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 total precipitation amount reaches 121 mm (4.7 in) over a span of 11 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 121 mm (4.7 inches) of precipitation spread over approximately 11 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 89%. With an average temperature of 11°C (51°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and every breath a little more laborious, creating a challenging environment for travelers.

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 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 Knoxville

In Knoxville 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 Knoxville for better planning.

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 4, which falls under the moderate 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	9°C (49°F)	110 mm (4.3 inches)	86%	moderate
February Weather	13°C (55°F)	119 mm (4.7 inches)	84%	high
March Weather	15°C (59°F)	80 mm (3.2 inches)	83%	very high
April Weather	18°C (65°F)	95 mm (3.8 inches)	81%	very high
May Weather	23°C (74°F)	83 mm (3.3 inches)	81%	extreme
June Weather	26°C (79°F)	113 mm (4.4 inches)	81%	extreme
July Weather	27°C (82°F)	95 mm (3.7 inches)	83%	extreme
August Weather	27°C (81°F)	118 mm (4.6 inches)	81%	extreme
September Weather	25°C (78°F)	96 mm (3.8 inches)	82%	very high
October Weather	21°C (69°F)	100 mm (3.9 inches)	78%	very high
November Weather	13°C (56°F)	76 mm (3.0 inches)	86%	high
December Weather	11°C (51°F)	121 mm (4.7 inches)	89%	moderate