December weather forecast
Smyrna, TN

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Weather in December

Winter takes center stage in December in Smyrna, Tennessee, settling down with a blanket of cold. As the month progresses, temperatures dip lower, culminating in a chilly end to the year. The skies often mirror these changes, going from scattered clouds to a denser covering as the days pass. And while the winter sunshine is still a part of December's narrative, it is far more muted than in previous months. The onset of widespread snowfall, with accumulations reaching up to 0.39" (10mm), is a visual indication of the full-fledged arrival of winter, fittingly capping off the year on a serene, crystalline note.

Temperature

The start of December involves a subtle temperature drop, shifting from a mild 57.7°F (14.3°C) in November to a chilly 49.3°F (9.6°C). Throughout the December nights, Smyrna encounters a low-temperature of 36.1°F (2.3°C).

Humidity

The most humid month is December, with an average relative humidity of 78%.

Rainfall

In Smyrna, Tennessee, in December, it is raining for 11.1 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, there are 150.1 rainfall days, and 24.41" (620mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Smyrna, in December, during 2.5 snowfall days, 0.39" (10mm) of snow is typically accumulated. Throughout the year, in Smyrna, there are 12.1 snowfall days, and 2.24" (57mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 48min of daylight.
On the first day of the month, sunrise is at 6:38 am and sunset at 4:32 pm. On the last day of December, sunrise is at 6:56 am and sunset at 4:42 pm CST.

Sunshine

In December, the average sunshine is 4.5h.

UV index

The months with the lowest UV index are February and 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 the average person.
Note: The maximum UV index of 2 during December translates into these guidelines:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. During bright days, sunglasses that offer UVA and UVB defense are recommended. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Updated: Aug 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in December?

In December, in Smyrna, the average high-temperature is 49.3°F (9.6°C), and the average low-temperature is 36.1°F (2.3°C). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 87.8°F (31°C).

What is the most humid month?

With an average relative humidity of 78%, December is the most humid month.

What is the average humidity in December?

In Smyrna, the average relative humidity in December is 78%.

How much does it rain in December?

In December, in Smyrna, the rain falls for 11.1 days. Throughout December, 1.85" (47mm) of precipitation is accumulated.

How much does it snow in December?

In Smyrna, in December, snow falls for 2.5 days, with typically accumulated 0.39" (10mm) of snow.

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.

What is the average length of the day in December?

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

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 6:38 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 4:42 pm CST.

How many hours of sunshine does Smyrna have in December?

The average sunshine duration in December in Smyrna is 4.5h.

When is the lowest UV index?

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

What is the UV index reading in December?

The average daily maximum UV index in December in Smyrna is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
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
Smyrna, TN

Average temperature in December - Smyrna, TN
  • Average high temperature in December: 49.3°F

The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (45.1°F).

  • Average low temperature in December: 36.1°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (30.7°F).

Average pressure in December
Smyrna, TN

Average pressure in December - Smyrna, TN
  • Average pressure in December: 30.15"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

Average wind speed in December
Smyrna, TN

Average wind speed in December - Smyrna, TN
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is February (8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in December
Smyrna, TN

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

The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are June, August and October (73%).

Average rainfall in December
Smyrna, TN

Average rainfall in December - Smyrna, TN
  • Average rainfall in December: 1.85"

The wettest month (with the highest rainfall) is July (3.19").
The driest month (with the least rainfall) is November (1.38").

Average rainfall days in December
Smyrna, TN

Average rainfall days in December - Smyrna, TN
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is November (7.7 days).

Average snowfall in December
Smyrna, TN

Average snowfall in December - Smyrna, TN
  • Average snowfall in December: 0.39"

The month with the highest snowfall is January (0.71").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Smyrna, TN

Average snowfall days in December - Smyrna, TN
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (3.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Smyrna, 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: 4h and 3min

The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

Average sunshine days in December
Smyrna, TN

Average sunshine days in December - Smyrna, TN
  • Average sunshine days in December: 17.1 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (11.8 days).

Average UV index in December
Smyrna, TN

Average UV index in December - Smyrna, 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 February and December (UV index 2).

Average cloud cover in December
Smyrna, TN

Average cloud cover in December - Smyrna, TN
  • Average cloud cover in December: 52

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 30).

Average visibility in December
Smyrna, TN

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

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

Smyrna, Tennessee, USA

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