December weather forecast and climate
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 still a chilly month, with average temperature varying between 32.4°F (0.2°C) and 46.6°F (8.1°C).

Temperature

In December, the average high-temperature slightly decreases, from a cool 54.5°F (12.5°C) in November, to a chilly 46.6°F (8.1°C). The average low-temperature, in December, is 32.4°F (0.2°C).

Humidity

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

Rainfall

In Johnson City, during December, the rain falls for 13.6 days and regularly aggregates up to 3.07" (78mm) of precipitation. Throughout the year, there are 187.8 rainfall days, and 32.76" (832mm) of precipitation is accumulated.

Snowfall

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

Daylight

December has the shortest days of the year, with an average of 9.7h of daylight.

Sunshine

The average sunshine in December is 5.5h.

UV index

Months with the lowest UV index in Johnson City 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 unprotected exposure to the Sun's UV rays for the average 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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?

In December, the average high-temperature is 46.6°F (8.1°C), and the average low-temperature is 32.4°F (0.2°C).

What is the most humid month in Johnson City?

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

What is the average humidity in December in Johnson City?

In December, the average relative humidity 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.

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

In December, in Johnson City, Tennessee, it is snowing for 6.2 days. Throughout December, 3.74" (95mm) of snow is accumulated.

When does it snow the most in Johnson City?

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

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

With an average of 9.7h of daylight, December has the shortest days of the year in Johnson City.

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

The average length of the day in December in Johnson City is 9.7h.

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

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

What is the month with 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 in Johnson City.

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

In Johnson City, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in December
Johnson City, TN

Average temperature in December - Johnson City, TN
  • Average high temperature in December: 8.1°C

The warmest month (with the highest average high temperature) is July (28.5°C).
The month with the lowest average high temperature is January (5.3°C).

  • Average low temperature in December: 0.2°C

The month with the highest average low temperature is July (15.9°C).
The coldest month (with the lowest average low temperature) is January (-3°C).

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Average pressure in December
Johnson City, TN

Average pressure in December - Johnson City, TN
  • Average pressure in December: 1020.8mbar

The month with the highest atmospheric pressure is November (1021.3mbar).
The month with the lowest atmospheric pressure is June (1015.7mbar).

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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: 9.3km/h

The windiest month (with the highest average wind speed) is April (10.6km/h).
The calmest month (with the lowest average wind speed) is August (5.9km/h).

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Average humidity in December
Johnson City, TN

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

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: 78mm

The wettest month (with the highest rainfall) is February (83mm).
The driest month (with the least rainfall) is September (45mm).

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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: 95mm

The month with the highest snowfall is December (95mm).
Months with the least snowfall are May, June, July, August and September (0mm).

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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).
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: 9.7h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in December: 5.5h

The month with the most sunshine is June (Average sunshine: 10.6h).
The month with the least sunshine is January (Average sunshine: 5h).

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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

Months with the highest UV index are June, July and August (UV index 6).
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).
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: 8km

Months with the highest visibility are April, June, July, October and November (9km).
Months with the lowest visibility are January, February, March, May, August, September and December (8km).

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