Last updated: June 24, 2025
In December, the average temperature in Johnson City, United States typically hovers around 0°C (32°F). You can expect a chilly range, with minimums dropping to -20°C (-3°F) and maximums peaking at 16°C (61°F). Make sure you're prepared for 88 mm (3.5 in) of precipitation over about 12 days, and keep in mind the high average humidity of 85%!
In December in Johnson City, the average temperature is 0°C (32°F). Maximum can reach 16°C (61°F) and minimum can be as low as -20°C (-3°F). Be prepared for a wide range of temperatures and pack accordingly if you're planning to travel during this month.
In Johnson City in December, the precipitation amount is 88 mm (3.5 in) over a span of 12 days.
In Johnson City in December, humidity is 85%. With an average temperature of 0°C (32°F), this humidity feels like a damp chill that clings to your clothes, making every step feel more arduous and the air heavy, which can dampen the enthusiasm for exploring the surroundings.
In Johnson City in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Johnson City, you can visit Hourly UV Index in Johnson City.
UV Risk Categories
Weather in Johnson City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Johnson City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 73 mm (2.9 inches) | 87% | moderate |
| February Weather | -2°C (29°F) | 89 mm (3.5 inches) | 85% | moderate |
| March Weather | 2°C (35°F) | 89 mm (3.5 inches) | 85% | high |
| April Weather | 8°C (47°F) | 120 mm (4.7 inches) | 83% | very high |
| May Weather | 14°C (58°F) | 131 mm (5.1 inches) | 75% | very high |
| June Weather | 19°C (67°F) | 103 mm (4.1 inches) | 73% | very high |
| July Weather | 22°C (72°F) | 121 mm (4.8 inches) | 65% | very high |
| August Weather | 21°C (70°F) | 108 mm (4.2 inches) | 62% | very high |
| September Weather | 17°C (64°F) | 95 mm (3.7 inches) | 66% | very high |
| October Weather | 12°C (54°F) | 135 mm (5.3 inches) | 79% | high |
| November Weather | 4°C (39°F) | 92 mm (3.6 inches) | 87% | moderate |
| December Weather | 0°C (32°F) | 88 mm (3.5 inches) | 85% | low |