Last updated: June 24, 2025
In December, the average temperature in Charleston, United States hovers around 4°C (39°F), with minimums dipping as low as -11°C (13°F) and maximums reaching up to 19°C (66°F). Expect a precipitation amount of 102 mm (4.0 in) over approximately 10 days, coupled with an average humidity level of 80%. Prepare for a chilly, damp experience!
In December in Charleston, the average temperature is 4°C (39°F), with maximums occasionally reaching 19°C (66°F) and minimums plunging as low as -11°C (13°F). This range makes it essential for travelers to pack layers to stay comfortable in varying conditions.
In Charleston in December, the total precipitation amount is 102 mm (4.0 in) falling over the course of 10 days.
In Charleston in December, humidity is 80%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring extra layers to stay warm while navigating through the misty streets.
In Charleston 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 Charleston, you can visit Hourly UV Index in Charleston.
UV Risk Categories
Weather in Charleston varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Charleston, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 1°C (35°F) | 66 mm (2.6 inches) | 84% | moderate |
February Weather | 3°C (37°F) | 107 mm (4.2 inches) | 82% | moderate |
March Weather | 6°C (43°F) | 103 mm (4.0 inches) | 81% | high |
April Weather | 12°C (53°F) | 111 mm (4.4 inches) | 78% | very high |
May Weather | 17°C (63°F) | 118 mm (4.6 inches) | 69% | very high |
June Weather | 22°C (73°F) | 94 mm (3.7 inches) | 69% | very high |
July Weather | 26°C (79°F) | 144 mm (5.6 inches) | 62% | very high |
August Weather | 25°C (77°F) | 126 mm (5.0 inches) | 65% | very high |
September Weather | 21°C (71°F) | 91 mm (3.6 inches) | 68% | very high |
October Weather | 16°C (61°F) | 130 mm (5.1 inches) | 74% | high |
November Weather | 8°C (47°F) | 82 mm (3.2 inches) | 82% | moderate |
December Weather | 4°C (39°F) | 102 mm (4.0 inches) | 80% | low |