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December Weather in Mount Pleasant, United States

Last updated: June 24, 2025

In December, the average temperature in Mount Pleasant, United States hovers around -5°C (23°F), with minimums dipping as low as -24°C (-10°F) and maximums reaching up to 12°C (53°F). Expect around 53 mm (2.1 in) of precipitation spread over 10 days, while the air remains quite humid with an average of 87% humidity.

December Temperature in Mount Pleasant

In December in Mount Pleasant, the average temperature is -5°C (23°F), with maximums reaching up to 12°C (53°F) and minimums dropping as low as -24°C (-10°F). Travelers should be prepared for a wide temperature range and pack accordingly for both chilly and mild conditions.

December Weather in Mount Pleasant: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Mount Pleasant, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mount Pleasant, December typically has an average temperature of -5°C (23°F), with highs reaching up to 12°C (53°F) and lows dropping to around -24°C (-10°F).
JanFebMarAprMayJunJulAugSepOctNovDec222432384863706858413323
Data source: Temperature data for Mount Pleasant 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 Mount Pleasant

In Mount Pleasant in December, the precipitation amount is 53 mm (2.1 in) spread over a duration of 10 days.

December Precipitation Trends in Mount Pleasant

The chart displays monthly precipitation patterns in Mount Pleasant, 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 Mount Pleasant, December typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec565960436318422531403653
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mount Pleasant

In Mount Pleasant in December humidity is 87%. With an average temperature of -5°C (23°F), this humidity feels like a heavy, damp blanket enveloping you, making even the cold air seem more biting and clammy, which can be quite uncomfortable for traveling.

December Average Humidity in Mount Pleasant

This chart illustrates the average monthly humidity levels in Mount Pleasant, 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 Mount Pleasant is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%77%70%54%45%37%34%47%67%82%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mount Pleasant

In Mount Pleasant 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 Mount Pleasant for better planning.

Maximum UV Index Levels in Mount Pleasant for December

The chart shows the monthly maximum UV Index (UVI) for Mount Pleasant 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 Mount Pleasant typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110754
Data source: Mount Pleasant 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 Mount Pleasant Compares to Other Months

Weather in Mount Pleasant varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mount Pleasant, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Mount Pleasant, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)56 mm (2.2 inches)87%moderate
February Weather-5°C (24°F)59 mm (2.3 inches)88%high
March Weather0°C (32°F)60 mm (2.4 inches)77%very high
April Weather3°C (38°F)43 mm (1.7 inches)69%very high
May Weather9°C (49°F)63 mm (2.5 inches)54%extreme
June Weather17°C (63°F)18 mm (0.7 inches)45%extreme
July Weather21°C (70°F)42 mm (1.7 inches)37%extreme
August Weather20°C (68°F)25 mm (1.0 inches)34%extreme
September Weather15°C (59°F)31 mm (1.2 inches)47%very high
October Weather5°C (42°F)40 mm (1.6 inches)67%high
November Weather1°C (34°F)36 mm (1.4 inches)82%moderate
December Weather-5°C (23°F)53 mm (2.1 inches)87%moderate

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