December weather forecast
Signal Mountain, TN

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Weather in December

The first month of the winter, December, is also a frosty month in Signal Mountain, Tennessee, with an average temperature varying between 49.3°F (9.6°C) and 35.8°F (2.1°C).

Temperature

The arrival of December corresponds with a light shift in temperature, down from a refreshing 57°F (13.9°C) in November to a frosty 49.3°F (9.6°C). Signal Mountain experiences a mean temperature of 35.8°F (2.1°C) during December nights.

Humidity

With an average relative humidity of 81%, December is the most humid month in Signal Mountain.

Rainfall

December is the month with the most rainfall. Rain falls for 14.5 days and accumulates 4.53" (115mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Signal Mountain. In Signal Mountain, during December, snow falls for 3 days and regularly aggregates up to 1.06" (27mm) of snow. In Signal Mountain, during the entire year, snow falls for 17.1 days and aggregates up to 5.08" (129mm) of snow.

Daylight

With an average of 9h and 48min of daylight, December has the shortest days of the year in Signal Mountain.
On the first day of the month, sunrise is at 7:31 am and sunset at 5:29 pm. On the last day of December, sunrise is at 7:49 am and sunset at 5:39 pm EST.

Sunshine

December has the least sunshine of the year, with an average of 4.9h of sunshine.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: A maximum high daily UV index of 2 during December translates into the following directions:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
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Frequently asked questions

What is the usual temperature for Signal Mountain in December?

In Signal Mountain, 49.3°F (9.6°C) is the average high-temperature and 35.8°F (2.1°C) is the average low-temperature during December. In September, the average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 86°F (30°C).

What is the most humid month in Signal Mountain?

With an average relative humidity of 81%, December is the most humid month in Signal Mountain, Tennessee.

What is the average humidity in December in Signal Mountain?

In December, the average relative humidity in Signal Mountain is 81%.

What is the rainiest month in Signal Mountain?

The month with the most rainfall in Signal Mountain is December, when the rain falls for 14.5 days and typically aggregates up to 4.53" (115mm) of precipitation.

How much does it rain in Signal Mountain in December?

In Signal Mountain, Tennessee, in December, during 14.5 rainfall days, 4.53" (115mm) of precipitation is typically accumulated.

How much does it snow in Signal Mountain in December?

In Signal Mountain, Tennessee, in December, during 3 snowfall days, 1.06" (27mm) of snow is typically accumulated.

What is the month with the shortest days in Signal Mountain?

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 Signal Mountain?

The average day length in December in Signal Mountain, Tennessee, is 9h and 50min.

What time are sunrise and sunset in December in Signal Mountain?

On the first day of December in Signal Mountain, Tennessee, sunrise is at 7:31 am and sunset at 5:29 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 5:39 pm EST.

What is the month with the least sunshine in Signal Mountain?

The month with the least sunshine in Signal Mountain is December, with an average of 4.9h of sunshine.

How long on average sun shines in December in Signal Mountain?

In Signal Mountain, the average sunshine duration in December is 4.9h.

When is the lowest UV index in Signal Mountain?

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

What is the UV index reading in December in Signal Mountain?

The average daily maximum UV index in December in Signal Mountain is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from 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
Signal Mountain, TN

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

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (45.1°F).

  • Average low temperature in December: 35.8°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

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Average pressure in December
Signal Mountain, TN

Average pressure in December - Signal Mountain, 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 (29.98"Hg).

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Average wind speed in December
Signal Mountain, TN

Average wind speed in December - Signal Mountain, TN
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is February (6.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

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Average humidity in December
Signal Mountain, TN

Average humidity in December - Signal Mountain, TN
  • Average humidity in December: 81%

The month with the highest relative humidity is December (81%).
The months with the lowest relative humidity are June, July, August, September, October and November (76%).

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Average rainfall in December
Signal Mountain, TN

Average rainfall in December - Signal Mountain, TN
  • Average rainfall in December: 4.53"

The wettest month (with the highest rainfall) is December (4.53").
The driest month (with the least rainfall) is September (2.76").

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Average rainfall days in December
Signal Mountain, TN

Average rainfall days in December - Signal Mountain, TN
  • Average rainfall days in December: 14.5 days

The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is November (10.5 days).

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Average snowfall in December
Signal Mountain, TN

Average snowfall in December - Signal Mountain, TN
  • Average snowfall in December: 1.06"

The month with the highest snowfall is February (2.01").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Signal Mountain, TN

Average snowfall days in December - Signal Mountain, TN
  • Average snowfall days in December: 3 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Signal Mountain, TN

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

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).

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Average sunshine days in December
Signal Mountain, TN

Average sunshine days in December - Signal Mountain, TN
  • Average sunshine days in December: 14.8 days

The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is July (7.7 days).

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Average UV index in December
Signal Mountain, TN

Average UV index in December - Signal Mountain, 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).

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Average cloud cover in December
Signal Mountain, TN

Average cloud cover in December - Signal Mountain, TN
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 31).

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Average visibility in December
Signal Mountain, TN

Average visibility in December - Signal Mountain, TN
  • Average visibility in December: 5mi

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

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Signal Mountain, Tennessee, USA

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