December weather forecast
Johnson City, TN

The front entrance to the Public Library in Johnson City, Tennessee
The front entrance to the Public Library in Johnson City, Tennessee

Weather in December

December, the first month of the winter in Johnson City, is also a frosty month, with an average temperature fluctuating between 32.4°F (0.2°C) and 46.6°F (8.1°C).

Temperature

In Johnson City, the average high-temperature in December marginally drops from a cool 54.5°F (12.5°C) in November to a frosty 46.6°F (8.1°C). In Johnson City, the average low-temperature is 32.4°F (0.2°C).

Humidity

The months with the highest humidity in Johnson City are February and December, with an average relative humidity of 79%.

Rainfall

In Johnson City, in December, it is raining for 13.6 days, with typically 3.07" (78mm) of accumulated precipitation. Throughout the year, there are 187.8 rainfall days, and 32.76" (832mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. December is the month with the most snowfall. Snow falls for 6.2 days and accumulates 3.74" (95mm) of snow.

Daylight

The month with the shortest days in Johnson City, Tennessee, is December, with an average of 9h and 44min of daylight.
On the first day of the month, sunrise is at 7:22 am and sunset at 5:14 pm. On the last day of December, sunrise is at 7:40 am and sunset at 5:24 pm EST.

Sunshine

The average sunshine in December is 5.5h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Johnson City, Tennessee. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Johnson City?

The average high-temperature, in December, is 46.6°F (8.1°C), while the average low-temperature is 32.4°F (0.2°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in August is computed to be 89.6°F (32°C).

What are the most humid months in Johnson City?

February and December, with an average relative humidity of 79%, are most humid months in Johnson City.

What is the average humidity in December in Johnson City?

In Johnson City, the average relative humidity in December is 79%.

How many days does it rain in December in Johnson City?

In December, in Johnson City, the rain falls for 13.6 days. Throughout December, 3.07" (78mm) of precipitation is accumulated.

When does it snow the most in Johnson City?

December is the month with the most snowfall in Johnson City, Tennessee. Snow falls for 6.2 days and accumulates 3.74" (95mm) of snow.

How many days does it snow in December in Johnson City?

In Johnson City, Tennessee, during December, snow falls for 6.2 days and regularly aggregates up to 3.74" (95mm) of snow.

What is the month with the shortest days in Johnson City?

December has the shortest days of the year, with an average of 9h and 44min of daylight.

How many hours of daylight does Johnson City have in December?

The average day length in December is 9h and 44min.

When are sunrise and sunset in December in Johnson City?

In December, on the first day of the month, sunrise is at 7:22 am and sunset at 5:14 pm. On the last day of the month, in Johnson City, Tennessee, sunrise is at 7:40 am and sunset at 5:24 pm EST.

How long on average sun shines in December in Johnson City?

The average sunshine duration in December in Johnson City is 5.5h.

What are the months with the lowest UV index in Johnson City?

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

What is the UV index intensity in December in Johnson City?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Johnson City, TN

Average temperature in December - Johnson City, TN
  • Average high temperature in December: 46.6°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (41.5°F).

  • Average low temperature in December: 32.4°F

The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).

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Average pressure in December
Johnson City, TN

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

The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).

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Average wind speed in December
Johnson City, TN

Average wind speed in December - Johnson City, TN
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

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Average humidity in December
Johnson City, TN

Average humidity in December - Johnson City, TN
  • Average humidity in December: 79%

The months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is November (75%).

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Average rainfall in December
Johnson City, TN

Average rainfall in December - Johnson City, TN
  • Average rainfall in December: 3.07"

The wettest month (with the highest rainfall) is February (3.27").
The driest month (with the least rainfall) is September (1.77").

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Average rainfall days in December
Johnson City, TN

Average rainfall days in December - Johnson City, TN
  • Average rainfall days in December: 13.6 days

The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (11.2 days).

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Average snowfall in December
Johnson City, TN

Average snowfall in December - Johnson City, TN
  • Average snowfall in December: 3.74"

The month with the highest snowfall is December (3.74").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Johnson City, TN

Average snowfall days in December - Johnson City, TN
  • Average snowfall days in December: 6.2 days

The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Johnson City, TN

Average daylight in December / Average sunshine in December - Johnson City, TN
  • Average daylight in December: 9h and 44min

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 44min).

  • Average sunshine in December: 5h and 30min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).

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Average sunshine days in December
Johnson City, TN

Average sunshine days in December - Johnson City, TN
  • Average sunshine days in December: 13.2 days

The month with the most sunshine days is October (16.5 days).
The month with the least sunshine days is July (8.3 days).

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Average UV index in December
Johnson City, TN

Average UV index in December - Johnson City, TN
  • Average UV index in December: 2

The months with the highest UV index are 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
Johnson City, TN

Average cloud cover in December - Johnson City, TN
  • Average cloud cover in December: 47

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

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Average visibility in December
Johnson City, TN

Average visibility in December - Johnson City, TN
  • Average visibility in December: 5mi

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

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