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December Weather in Charleston, United States

Last updated: June 24, 2025

In December, the average temperature in Charleston, United States is a cool 10°C (50°F). Expect a wide temperature range, with minimums dipping to -5°C (22°F) and maximums reaching up to 26°C (80°F). Prepare for some moisture too, as average precipitation is around 143 mm (5.6 in) over approximately 10 days. With an average humidity of 88%, it’s wise to layer up and stay dry!

December Temperature in Charleston

In December in Charleston, the average temperature is 10°C (50°F). Maximum temperatures can reach 26°C (80°F), while minimums can drop as low as -5°C (22°F). Be prepared for a range of weather conditions if you're planning to travel during this time!

December Weather in Charleston: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Charleston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Charleston, December typically has an average temperature of 10°C (50°F), with highs reaching up to 26°C (80°F) and lows dropping to around -5°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec454958637279828177665249
Data source: Temperature data for Charleston generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Charleston

In Charleston in December, the precipitation amount is 143 mm (5.6 in) over the course of 10 days.

December Precipitation Trends in Charleston

The chart displays monthly precipitation patterns in Charleston, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Charleston, December typically receives around 143 mm (5.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec12019516814911513411212410011384143
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Charleston

In Charleston in December, humidity is 88%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and encouraging travelers to seek cozy indoor activities instead.

December Average Humidity in Charleston

This chart illustrates the average monthly humidity levels in Charleston, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Charleston is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%80%82%83%80%80%75%73%76%84%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Charleston

In Charleston in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Charleston for better planning.

Maximum UV Index Levels in Charleston for December

The chart shows the monthly maximum UV Index (UVI) for Charleston in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Charleston typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109764
Data source: Charleston December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Charleston Compares to Other Months

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.

This table compares monthly weather conditions in Charleston, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)120 mm (4.7 inches)84%moderate
February Weather10°C (49°F)195 mm (7.7 inches)83%high
March Weather14°C (58°F)168 mm (6.6 inches)80%very high
April Weather17°C (63°F)149 mm (5.9 inches)82%very high
May Weather22°C (73°F)115 mm (4.5 inches)83%extreme
June Weather26°C (79°F)134 mm (5.3 inches)80%extreme
July Weather28°C (82°F)112 mm (4.4 inches)80%extreme
August Weather27°C (81°F)124 mm (4.9 inches)75%very high
September Weather25°C (78°F)100 mm (3.9 inches)73%very high
October Weather19°C (67°F)113 mm (4.5 inches)76%high
November Weather11°C (53°F)84 mm (3.3 inches)84%high
December Weather10°C (50°F)143 mm (5.6 inches)88%moderate

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