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

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

Temperature

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

Humidity

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

Rainfall

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

Snowfall

January through April, October through December are months with snowfall in Johnson City. The month with the most snowfall is December, when snow falls for 6.2 days and typically aggregates up to 3.74" (95mm) of snow.

Daylight

December has the shortest days of the year in Johnson City, 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, in Johnson City, sunrise is at 7:40 am and sunset at 5:24 pm EST.

Sunshine

In December, the average sunshine in Johnson City is 5.5h.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
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 Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What are the most humid months in Johnson City?

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

What is the average humidity in December in Johnson City?

The average relative humidity in December in Johnson City, Tennessee, is 79%.

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

In Johnson City, during December, the rain falls for 13.6 days and regularly aggregates up to 3.07" (78mm) of precipitation.

When does it snow the most in Johnson City?

The month with the most snowfall in Johnson City, Tennessee, is December, when snow falls for 6.2 days and typically aggregates up to 3.74" (95mm) of snow.

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

In Johnson City, 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?

With an average of 9h and 44min of daylight, December has the shortest days of the year in Johnson City, Tennessee.

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

In Johnson City, Tennessee, 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 many hours of sunshine does Johnson City have in December?

In December, the average sunshine duration in Johnson City, Tennessee, is 5.5h.

When is the lowest UV index in Johnson City?

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

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

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation.
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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