Last updated: June 24, 2025
In December, the average temperature in Johnson City, United States hovers around 5°C (41°F), offering a chilly yet invigorating atmosphere. Expect minimum temperatures to plunge to -12°C (10°F), while highs can reach a pleasant 21°C (70°F). Rainfall is notable, with 125 mm (4.9 in) accumulating over about 13 days, contributing to an average humidity of 86% that envelops the region.
In December in Johnson City, the average temperature is 5°C (41°F). Maximum can reach 21°C (70°F) and minimum can be as low as -12°C (10°F). Travelers should be prepared for a wide range of temperatures, from chilly days to surprisingly warm afternoons.
In Johnson City in December, the total precipitation amount is 125 mm (4.9 in), occurring over a span of 13 days.
In Johnson City in December humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.
In Johnson City in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Johnson City, you can check the information here.
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 (37°F) | 95 mm (3.7 inches) | 87% | moderate |
February Weather | 6°C (43°F) | 145 mm (5.7 inches) | 87% | high |
March Weather | 8°C (47°F) | 129 mm (5.1 inches) | 86% | very high |
April Weather | 12°C (55°F) | 137 mm (5.4 inches) | 84% | very high |
May Weather | 17°C (64°F) | 122 mm (4.8 inches) | 83% | extreme |
June Weather | 20°C (69°F) | 118 mm (4.7 inches) | 83% | extreme |
July Weather | 23°C (73°F) | 102 mm (4.0 inches) | 79% | extreme |
August Weather | 22°C (71°F) | 118 mm (4.7 inches) | 66% | very high |
September Weather | 20°C (68°F) | 97 mm (3.8 inches) | 68% | very high |
October Weather | 15°C (59°F) | 122 mm (4.8 inches) | 78% | very high |
November Weather | 7°C (45°F) | 83 mm (3.3 inches) | 89% | moderate |
December Weather | 5°C (41°F) | 125 mm (4.9 inches) | 86% | moderate |