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December Weather in Charleston, United States

Last updated: June 24, 2025

In December, the average temperature in Charleston, United States hovers around 6°C (43°F). Be prepared for a potential chill, as temperatures can dip as low as -12°C (11°F), while the mercury may rise to a pleasant 23°C (74°F). Expect 97 mm (3.8 in) of precipitation spread over 8 days, contributing to an average humidity of 88%. Plan accordingly for a mix of cool and wet weather!

December Temperature in Charleston

In December in Charleston, the average temperature is 6°C (43°F). The maximum can reach 23°C (74°F), and the minimum can be as low as -12°C (11°F). Be prepared for a wide range of temperatures when traveling to Charleston during this month.

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 6°C (43°F), with highs reaching up to 23°C (74°F) and lows dropping to around -12°C (11°F).
JanFebMarAprMayJunJulAugSepOctNovDec374151587077817874624743
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 total precipitation amount is 97 mm (3.8 in), occurring over a span of 8 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 97 mm (3.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1101391691411511121011028512210197
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 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and prompting you to seek warm shelter frequently.

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.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%84%80%82%83%80%76%75%75%85%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 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 Charleston, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111110109753
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 Weather3°C (38°F)110 mm (4.3 inches)86%moderate
February Weather5°C (41°F)139 mm (5.5 inches)84%high
March Weather10°C (51°F)169 mm (6.6 inches)84%high
April Weather14°C (58°F)140 mm (5.5 inches)80%very high
May Weather21°C (70°F)151 mm (6.0 inches)82%extreme
June Weather25°C (78°F)112 mm (4.4 inches)83%extreme
July Weather27°C (81°F)101 mm (4.0 inches)79%very high
August Weather25°C (78°F)102 mm (4.0 inches)76%very high
September Weather23°C (74°F)85 mm (3.3 inches)75%very high
October Weather16°C (62°F)122 mm (4.8 inches)74%high
November Weather8°C (47°F)101 mm (4.0 inches)85%moderate
December Weather6°C (43°F)97 mm (3.8 inches)88%moderate

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