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December Weather in Summerville, United States

Last updated: June 24, 2025

In Summerville, United States, the average temperature for December hovers around 1°C (34°F). However, temperatures can vary widely, with a minimum of -15°C (6°F) and a maximum of 17°C (63°F). Expect about 106 mm (4.2 in) of precipitation spread over 13 days, contributing to an average humidity level of 88%, creating a crisp and damp atmosphere.

December Temperature in Summerville

In December in Summerville, the average temperature is 1°C (34°F). The maximum can reach 17°C (63°F) and the minimum can be as low as -15°C (6°F). Travelers should be prepared for a wide range of temperatures and dress in layers to ensure comfort during their stay.

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

The chart illustrates December temperature patterns in Summerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Summerville, December typically has an average temperature of 1°C (34°F), with highs reaching up to 17°C (63°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec283239496068737165554034
Data source: Temperature data for Summerville 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 Summerville

In Summerville in December, the precipitation amount is 106 mm (4.2 in) spread over a duration of 13 days.

December Precipitation Trends in Summerville

The chart displays monthly precipitation patterns in Summerville, 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 Summerville, December typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec100123106135156139137105125128100106
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Summerville

In Summerville in December humidity is 88%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making travel feel damp and brisk, where every breath carries a crisp bite, and the air clings to your skin, urging you to seek warmth and comfort.

December Average Humidity in Summerville

This chart illustrates the average monthly humidity levels in Summerville, 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 Summerville is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Summerville

In Summerville 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 Summerville, you can visit Hourly UV Index in Summerville.

Maximum UV Index Levels in Summerville for December

The chart shows the monthly maximum UV Index (UVI) for Summerville 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 Summerville typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Summerville 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 Summerville Compares to Other Months

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

This table compares monthly weather conditions in Summerville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)100 mm (3.9 inches)89%moderate
February Weather0°C (32°F)123 mm (4.8 inches)90%moderate
March Weather4°C (39°F)106 mm (4.2 inches)89%high
April Weather9°C (49°F)135 mm (5.3 inches)88%very high
May Weather15°C (60°F)156 mm (6.1 inches)80%very high
June Weather20°C (68°F)139 mm (5.5 inches)79%very high
July Weather23°C (73°F)137 mm (5.4 inches)74%very high
August Weather22°C (71°F)105 mm (4.1 inches)64%very high
September Weather18°C (65°F)125 mm (4.9 inches)67%very high
October Weather13°C (55°F)128 mm (5.0 inches)81%high
November Weather4°C (40°F)100 mm (3.9 inches)89%moderate
December Weather1°C (34°F)106 mm (4.2 inches)88%low

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