December weather forecast
Knoxville, TN

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The scenic scape of the little town of Knoxville in Tennessee
The scenic scape of the little town of Knoxville in Tennessee

Weather in December

Knoxville embraces winter in its full form by December. Following November, the temperature continues its downward trend to solidify December as a distinctively frigid month. With an average high of 49.1°F (9.5°C), it announces winter's arrival definitively. Despite the lower temperatures, snowfall remains minimal. Thus, December is all about the chilly winds, crackling fireplaces, and anticipation of a snowy New Year.

Temperature

Knoxville, Tennessee, observes a small decrease in the average high-temperature with the arrival of December, falling from November's refreshing 57.2°F (14°C) to a chilly 49.1°F (9.5°C). Knoxville experiences a nighttime temperature average of 35.1°F (1.7°C) during December.

Humidity

February and December, with an average relative humidity of 78%, are the most humid months.

Rainfall

In Knoxville, in December, during 12.2 rainfall days, 3.07" (78mm) of precipitation is typically accumulated. In Knoxville, during the entire year, the rain falls for 148.9 days and collects up to 29.57" (751mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Knoxville, in December, snow falls for 1.7 days, with typically accumulated 0.47" (12mm) of snow. In Knoxville, Tennessee, during the entire year, snow falls for 11.5 days and aggregates up to 3.94" (100mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 48min of daylight.
On the first day of December, sunrise is at 7:28 am and sunset at 5:21 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:32 pm EST.

Sunshine

The average sunshine in December is 5h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A typical high UV index of 2 in December suggests the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Jun 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in December?

An average high-temperature, in December, in Knoxville, is 49.1°F (9.5°C) and the average low-temperature is 35.1°F (1.7°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in September is computed to be 87.8°F (31°C).

What is the most humid month?

The months with the highest humidity are February and December, with an average relative humidity of 78%.

What is the average humidity in December?

In December, the average relative humidity is 78%.

How much does it rain in December?

In Knoxville, in December, it is raining for 12.2 days, with typically 3.07" (78mm) of accumulated precipitation.

How much does it snow in December?

In December, it is snowing for 1.7 days. Throughout December, 0.47" (12mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 48min of daylight.

How many hours of daylight does Knoxville have in December?

In Knoxville, Tennessee, the average day length in December is 9h and 46min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:28 am and sunset at 5:21 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:32 pm EST.

How many hours of sunshine does Knoxville have in December?

In December, the average sunshine duration in Knoxville is 5h.

What is the month with the lowest UV index?

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2.

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Knoxville, TN

Average temperature in December - Knoxville, TN
  • Average high temperature in December: 49.1°F

The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is January (44.8°F).

  • Average low temperature in December: 35.1°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).

Average pressure in December
Knoxville, TN

Average pressure in December - Knoxville, TN
  • Average pressure in December: 30.14"Hg

The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

Average wind speed in December
Knoxville, TN

Average wind speed in December - Knoxville, TN
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity in December
Knoxville, TN

Average humidity in December - Knoxville, TN
  • Average humidity in December: 78%

The months with the highest relative humidity are February and December (78%).
The month with the lowest relative humidity is August (70%).

Average rainfall in December
Knoxville, TN

Average rainfall in December - Knoxville, TN
  • Average rainfall in December: 3.07"

The wettest month (with the highest rainfall) is February (3.66").
The driest month (with the least rainfall) is September (1.5").

Average rainfall days in December
Knoxville, TN

Average rainfall days in December - Knoxville, TN
  • Average rainfall days in December: 12.2 days

The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is November (8.4 days).

Average snowfall in December
Knoxville, TN

Average snowfall in December - Knoxville, TN
  • Average snowfall in December: 0.47"

The month with the highest snowfall is February (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Knoxville, TN

Average snowfall days in December - Knoxville, TN
  • Average snowfall days in December: 1.7 days

The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Knoxville, TN

Average daylight in December / Average sunshine in December - Knoxville, TN
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in December: 5h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in December
Knoxville, TN

Average sunshine days in December - Knoxville, TN
  • Average sunshine days in December: 17 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (12.9 days).

Average UV index in December
Knoxville, TN

Average UV index in December - Knoxville, TN
  • Average UV index in December: 2

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

Average cloud cover in December
Knoxville, TN

Average cloud cover in December - Knoxville, TN
  • Average cloud cover in December: 50

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 28).

Average visibility in December
Knoxville, TN

Average visibility in December - Knoxville, TN
  • Average visibility in December: 6mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

Knoxville, Tennessee, USA

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