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 average high temperature in December: 8.9°C

The warmest month (with the highest average high temperature) is July (30°C).
The month with the lowest average high temperature is January (7.2°C).

  • The average low temperature in December: -2.2°C

The month with the highest average low temperature is July (17.8°C).
The coldest month (with the lowest average low temperature) is January (-3.9°C).

  • The average humidity in December: 69.5%

Months with the highest relative humidity are August and September (76.5%).
The month with the lowest relative humidity is January (59%).

  • The average rainfall in December: 91.9mm

The wettest month (with the highest rainfall) is July (138.2mm).
The driest month (with the lowest rainfall) is October (62mm).

  • The average snowfall in December: 66mm

The month with the highest snowfall is January (132.1mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

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