December weather forecast
Great Smoky Mountains National Park, TN

Breathtaking panorama of the Great Smoky Mountains National Park in Tennessee,
Breathtaking panorama of the Great Smoky Mountains National Park in Tennessee,

Weather in December

The first month of the winter, December, is also a wintry month in Great Smoky Mountains National Park, Tennessee, with an average temperature fluctuating between 41°F (5°C) and 25°F (-3.9°C).

Temperature

In December, the average high-temperature marginally drops from a chilly 48°F (8.9°C) in November to a cold 41°F (5°C). The average low-temperature, in Great Smoky Mountains National Park, is 25°F (-3.9°C).

Rainfall

In Great Smoky Mountains National Park, it is raining for 10 days, with typically 7.48" (190mm) of accumulated precipitation. In Great Smoky Mountains National Park, during the entire year, the rain falls for 123 days and collects up to 72.13" (1832mm) of precipitation.

Snowfall

Months with snowfall in Great Smoky Mountains National Park are January through May, October through December. In Great Smoky Mountains National Park, during December, snow falls for 5 days and regularly aggregates up to 14.29" (363mm) of snow. Throughout the year, there are 27 snowfall days, and 81.5" (2070mm) of snow is accumulated.

Daylight

With an average of 9h and 48min of daylight, December has the shortest days of the year in Great Smoky Mountains National Park, Tennessee.
On the first day of December in Great Smoky Mountains National Park, sunrise is at 7:24 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 5:30 pm EST.

Sunshine

With an average of 4h of sunshine, December has the least sunshine of the year.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Great Smoky Mountains National Park?

The average high-temperature, in December, in Great Smoky Mountains National Park, Tennessee, is 41°F (5°C), while the average low-temperature is 25°F (-3.9°C).

How much does it rain in Great Smoky Mountains National Park in December?

In Great Smoky Mountains National Park, in December, during 10 rainfall days, 7.48" (190mm) of precipitation is typically accumulated.

How much does it snow in Great Smoky Mountains National Park in December?

In Great Smoky Mountains National Park, Tennessee, during December, snow falls for 5 days and regularly aggregates up to 14.29" (363mm) of snow.

What is the month with the shortest days in Great Smoky Mountains National Park?

December has the shortest days of the year in Great Smoky Mountains National Park, with an average of 9h and 48min of daylight.

What is the average length of the day in December in Great Smoky Mountains National Park?

The average day length in December in Great Smoky Mountains National Park is 9h and 48min.

What time are sunrise and sunset in December in Great Smoky Mountains National Park?

In December, on the first day of the month, sunrise is at 7:24 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 5:30 pm EST.

What is the month with the least sunshine in Great Smoky Mountains National Park?

December has the least sunshine of the year, with an average of 4h of sunshine.

How long on average sun shines in December in Great Smoky Mountains National Park?

The average sunshine duration in December in Great Smoky Mountains National Park, Tennessee, is 4h.

When is the lowest UV index in Great Smoky Mountains National Park?

December is the month with the lowest UV index in Great Smoky Mountains National Park, Tennessee, with an average maximum UV index of 2.

How high is the UV index in December in Great Smoky Mountains National Park?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
Average high temperature
Average rainfall days
Average snowfall days
Average sunshine
Average UV index

Average temperature in December
Great Smoky Mountains National Park, TN

Average temperature in December - Great Smoky Mountains National Park, TN
  • Average high temperature in December: 41°F

The warmest month (with the highest average high temperature) is July (71°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 25°F

The months with the highest average low temperature are July and August (55°F).
The coldest month (with the lowest average low temperature) is January (20°F).

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Average rainfall in December
Great Smoky Mountains National Park, TN

Average rainfall in December - Great Smoky Mountains National Park, TN
  • Average rainfall in December: 7.5"

The wettest month (with the highest rainfall) is July (7.6").
The driest month (with the least rainfall) is October (4.3").

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Average rainfall days in December
Great Smoky Mountains National Park, TN

Average rainfall days in December - Great Smoky Mountains National Park, TN
  • Average rainfall days in December: 10 days

The month with the highest number of rainy days is July (14 days).
The months with the least rainy days are September, October and November (8 days).

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Average snowfall in December
Great Smoky Mountains National Park, TN

Average snowfall in December - Great Smoky Mountains National Park, TN
  • Average snowfall in December: 14.3"

The month with the highest snowfall is February (18.1").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Great Smoky Mountains National Park, TN

Average snowfall days in December - Great Smoky Mountains National Park, TN
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is January (7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Great Smoky Mountains National Park, TN

Average daylight in December / Average sunshine in December - Great Smoky Mountains National Park, TN
  • Average daylight in December: 9h and 48min

The month with the longest days is June (Average daylight: 14h and 32min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in December: 4h

The months with the most sunshine are May, June and July (Average sunshine: 9h).
The month with the least sunshine is December (Average sunshine: 4h).

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Average UV index in December
Great Smoky Mountains National Park, TN

Average UV index in December - Great Smoky Mountains National Park, TN
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 10).
The month with the lowest UV index is December (UV index 2).

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