Johnson City
Tennessee, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Johnson City, TN

The front entrance to the Public Library in Johnson City, Tennessee, with flags flying on either side of the main entrance
The front entrance to the Public Library in Johnson City, Tennessee, with flags flying on either side of the main entrance
The first month of the winter, December, is still a chilly month in Johnson City, Tennessee, with temperature in the range of an average high of 46.6°F (8.1°C) and an average low of 32.4°F (0.2°C).

Temperature

In December, the average high-temperature slightly decreases, from a cool 54.5°F (12.5°C) in November, to a frosty 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 most humid months in Johnson City.

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 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

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

Sunshine

In Johnson City, Tennessee, the average sunshine 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. A UV Index value of 2, and less, symbolizes a minimal health hazard from the exposure to the Sun's UV radiation for average individuals.
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 Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Johnson City?

In Johnson City, Tennessee, 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 in Johnson City, Tennessee.

What is the average humidity in December in Johnson City?

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

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

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

How much does it snow in Johnson City in December?

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

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.

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

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

What is the average length of the day in December in Johnson City?

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

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

The average sunshine in December in Johnson City, Tennessee, is 5.5h.

What is the month with the lowest UV index in Johnson City?

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

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

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

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%).

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 lowest rainfall) is September (1.77").

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 lowest number of rainy days is November (11.2 days).

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

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

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 lowest number of snowfall days are June, July, August and September (0 days).

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 shortest days is December (Average daylight: 9.7h).

  • Average sunshine in December: 5.5h

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

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).