nomadseason

December Weather in Knoxville, United States

Last updated: June 24, 2025

In December, the average temperature in Knoxville, United States hovers around 7°C (45°F), with a minimum dipping to -11°C (13°F) and a maximum reaching 23°C (73°F). Expect about 132 mm (5.2 in) of precipitation over 10 days, accompanied by an average humidity of 88%, creating a notably damp atmosphere.

December Temperature in Knoxville

In December in Knoxville, the average temperature is 7°C (45°F). Maximums can reach 23°C (73°F) and minimums can be as low as -11°C (13°F). Be sure to pack layers to stay comfortable while exploring the diverse weather conditions.

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 7°C (45°F), with highs reaching up to 23°C (73°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec414652596975797773634945
Data source: Temperature data for Knoxville generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Knoxville

In Knoxville in December, the total precipitation amount is 132 mm (5.2 in) over a span of 10 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 132 mm (5.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec981721551321061121201269111679132
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Knoxville

In Knoxville in December humidity is 88%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through a heavy, thick atmosphere that clings to your skin.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
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 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 Knoxville, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
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.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)98 mm (3.9 inches)86%moderate
February Weather8°C (46°F)172 mm (6.8 inches)86%high
March Weather11°C (52°F)155 mm (6.1 inches)86%very high
April Weather15°C (59°F)132 mm (5.2 inches)82%very high
May Weather21°C (69°F)106 mm (4.2 inches)85%extreme
June Weather24°C (75°F)112 mm (4.4 inches)85%extreme
July Weather26°C (79°F)120 mm (4.7 inches)83%extreme
August Weather25°C (78°F)126 mm (5.0 inches)76%very high
September Weather23°C (74°F)91 mm (3.6 inches)76%very high
October Weather17°C (63°F)116 mm (4.6 inches)80%high
November Weather9°C (49°F)79 mm (3.1 inches)88%moderate
December Weather7°C (45°F)132 mm (5.2 inches)88%moderate

Compare Knoxville's Climate with Cities Worldwide