December weather forecast
Shelbyville, TN

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Weather in December

December wraps up the year in Shelbyville, returning the city to winter's fold. The arrival of cold temperatures, reduced daylight, and higher humidity levels signify the onset of winter. Although snow is not as frequent, traces of snowfall can be observed. The mercury level plummets to its lowest for the year, with the highest temperature reaching only 50°F (10°C). As the city adorns itself in festive spirit, the chilly weather marks an apt ending to the weather cycle.

Temperature

During the shift to December, Shelbyville records a mild decrease in average high-temperature, moving from a moderate 57.6°F (14.2°C) in November to a fresh 50°F (10°C). Throughout the month of December, Shelbyville reports a steady low-temperature average of 36.3°F (2.4°C).

Humidity

With an average relative humidity of 80%, December is the most humid month.

Rainfall

In Shelbyville, in December, it is raining for 12.1 days, with typically 3.35" (85mm) of accumulated precipitation. In Shelbyville, during the entire year, the rain falls for 167.2 days and collects up to 38.78" (985mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Shelbyville, during December, snow falls for 2 days and regularly aggregates up to 0.55" (14mm) of snow. In Shelbyville, during the entire year, snow falls for 10.7 days and aggregates up to 2.83" (72mm) of snow.

Daylight

With an average of 9h and 48min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:37 am and sunset at 4:33 pm. On the last day of December, sunrise is at 6:54 am and sunset at 4:43 pm CST.

Sunshine

In December, the average sunshine is 4.6h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 2 suggests these recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are December temperatures in Shelbyville?

The high-temperature, in December, in Shelbyville, records 50°F (10°C), while the low-temperature is 36.3°F (2.4°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in September is computed to be 86°F (30°C).

What is the most humid month?

December is the most humid month, with an average relative humidity of 80%.

What is the average humidity in December?

The average relative humidity in December is 80%.

How many days does it rain in December?

In December, the rain falls for 12.1 days. Throughout December, 3.35" (85mm) of precipitation is accumulated.

How many days does it snow in December?

In Shelbyville, during December, snow falls for 2 days and regularly aggregates up to 0.55" (14mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Shelbyville have in December?

In December, the average day length is 9h and 49min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 6:37 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 4:43 pm CST.

How many hours of sunshine does Shelbyville have in December?

In Shelbyville, the average sunshine duration in December is 4.6h.

What is the month with the lowest UV index?

The months with the lowest UV index are January 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 is 2. A UV Index estimate of 2, and below, represents a low health risk 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
Shelbyville, TN

Average temperature in December - Shelbyville, TN
  • Average high temperature in December: 50°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (45.5°F).

  • Average low temperature in December: 36.3°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).

Average pressure in December
Shelbyville, TN

Average pressure in December - Shelbyville, 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
Shelbyville, TN

Average wind speed in December - Shelbyville, TN
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is February (8.5mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).

Average humidity in December
Shelbyville, TN

Average humidity in December - Shelbyville, TN
  • Average humidity in December: 80%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (74%).

Average rainfall in December
Shelbyville, TN

Average rainfall in December - Shelbyville, TN
  • Average rainfall in December: 3.35"

The wettest month (with the highest rainfall) is February (4.33").
The driest month (with the least rainfall) is September (2.09").

Average rainfall days in December
Shelbyville, TN

Average rainfall days in December - Shelbyville, TN
  • Average rainfall days in December: 12.1 days

The month with the highest number of rainy days is July (19.5 days).
The month with the least rainy days is November (8.9 days).

Average snowfall in December
Shelbyville, TN

Average snowfall in December - Shelbyville, TN
  • Average snowfall in December: 0.55"

The month with the highest snowfall is February (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Shelbyville, TN

Average snowfall days in December - Shelbyville, TN
  • Average snowfall days in December: 2 days

The month with the highest number of snowfall days is January (3.1 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
Shelbyville, TN

Average daylight in December / Average sunshine in December - Shelbyville, 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 4min

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

Average sunshine days in December
Shelbyville, TN

Average sunshine days in December - Shelbyville, TN
  • Average sunshine days in December: 16.7 days

The month with the most sunshine days is October (19.9 days).
The month with the least sunshine days is July (10.1 days).

Average UV index in December
Shelbyville, TN

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

Average cloud cover in December
Shelbyville, TN

Average cloud cover in December - Shelbyville, 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 31).

Average visibility in December
Shelbyville, TN

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

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

Shelbyville, Tennessee, USA

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