December Weather in Summerville, United States

Last updated: June 24, 2025

In December, the average temperature in Summerville, United States hovers around 12°C (53°F). Expect a minimum of -5°C (23°F) and a potential maximum of 27°C (80°F). Be prepared for 132 mm (5.2 in) of precipitation over approximately 9 days, and a high average humidity of 87%.

December Temperature in Summerville

In December in Summerville, the average temperature is 12°C (53°F). Maximums can reach 27°C (80°F), while minimums can drop as low as -5°C (23°F). This varied climate makes Summerville an ideal destination for travelers seeking diverse outdoor experiences.

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 12°C (53°F), with highs reaching up to 27°C (80°F) and lows dropping to around -5°C (23°F).

Data source: Temperature data for Summerville generated using information from the Copernicus Climate Change Service.

December Precipitation in Summerville

In Summerville in December, the total precipitation amount is 132 mm (5.2 in) over a span of 9 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 132 mm (5.2 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Summerville

In Summerville in December, humidity is 87%. With an average temperature of 12°C (53°F), this humidity feels like a damp blanket enveloping you, making travel uncomfortable and stifling, as the air thickens and clings to your skin, sapping your energy as you navigate the sights.

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 87%, offering insight into how humid the weather typically is during this month.

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 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 Summerville for better planning.

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 4, which falls under the moderate exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	64 mm (2.5 inches)	86%	moderate
February Weather	13°C (56°F)	92 mm (3.6 inches)	81%	high
March Weather	15°C (60°F)	71 mm (2.8 inches)	81%	very high
April Weather	19°C (66°F)	108 mm (4.2 inches)	79%	very high
May Weather	23°C (74°F)	92 mm (3.6 inches)	75%	extreme
June Weather	26°C (79°F)	156 mm (6.1 inches)	75%	extreme
July Weather	27°C (81°F)	191 mm (7.5 inches)	80%	extreme
August Weather	27°C (81°F)	176 mm (6.9 inches)	81%	extreme
September Weather	25°C (77°F)	146 mm (5.8 inches)	83%	very high
October Weather	21°C (70°F)	75 mm (3.0 inches)	78%	very high
November Weather	14°C (57°F)	70 mm (2.8 inches)	85%	high
December Weather	12°C (53°F)	132 mm (5.2 inches)	87%	moderate