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December Weather in Knoxville, United States

Last updated: June 24, 2025

In December, the average temperature in Knoxville, United States hovers around 0°C (32°F), with a potential low of -22°C (-8°F) and a soaring high of 23°C (74°F). Expect about 37 mm (1.5 in) of precipitation spread over 4 days, accompanied by an average humidity of 83%. Perfect for bundling up and enjoying the unique climate!

December Temperature in Knoxville

In December in Knoxville, the average temperature is 0°C (32°F), with maximums reaching 23°C (74°F) and minimums dropping as low as -22°C (-8°F). It's a season of contrasts, perfect for travelers who enjoy a mix of winter activities and milder days.

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 0°C (32°F), with highs reaching up to 23°C (74°F) and lows dropping to around -22°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec232541506375787569543932
Data source: Temperature data for Knoxville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Knoxville

In Knoxville in December, the precipitation amount is 37 mm (1.5 in) over the course of 4 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 37 mm (1.5 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec4447867115312977711211305038
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Knoxville

In Knoxville in December, humidity is 83%. With an average temperature of 0°C (32°F), this humidity feels like traveling through a thick mist, making every step heavy and the cold pierce even deeper, causing you to constantly seek shelter or warm beverages to counteract the damp chill.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35689111198643
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 Weather-5°C (24°F)44 mm (1.7 inches)78%moderate
February Weather-4°C (25°F)47 mm (1.8 inches)80%moderate
March Weather5°C (41°F)86 mm (3.4 inches)77%high
April Weather10°C (50°F)71 mm (2.8 inches)77%very high
May Weather17°C (63°F)153 mm (6.0 inches)77%very high
June Weather24°C (75°F)129 mm (5.1 inches)81%extreme
July Weather25°C (78°F)77 mm (3.0 inches)81%extreme
August Weather24°C (75°F)71 mm (2.8 inches)77%very high
September Weather21°C (69°F)121 mm (4.8 inches)73%very high
October Weather12°C (54°F)130 mm (5.1 inches)75%high
November Weather4°C (40°F)50 mm (2.0 inches)85%moderate
December Weather0°C (32°F)37 mm (1.5 inches)83%moderate

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