December Weather in Harleyville, United States

Last updated: June 24, 2025

The average temperature in Harleyville, United States during December hovers around 11°C (53°F), with a brisk minimum of -5°C (23°F) and an occasional sunny peak at 27°C (81°F). Expect about 135 mm (5.3 in) of precipitation spread across 9 days, contributing to an average humidity of 87%. Make sure to pack accordingly!

December Temperature in Harleyville

In December, in Harleyville, the average temperature is 11°C (53°F), with maximums reaching 27°C (81°F) and minimums dropping as low as -5°C (23°F). This varied climate makes it important for travelers to pack for both warm and cold conditions.

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

The chart illustrates December temperature patterns in Harleyville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harleyville, December typically has an average temperature of 11°C (53°F), with highs reaching up to 27°C (81°F) and lows dropping to around -5°C (23°F).

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

December Precipitation in Harleyville

In Harleyville in December, the precipitation amount is 135 mm (5.3 in) spread over 9 days.

December Precipitation Trends in Harleyville

The chart displays monthly precipitation patterns in Harleyville, 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 Harleyville, December typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Harleyville

In Harleyville in December, humidity is 87%. With an average temperature of 11°C (53°F), this humidity feels like a damp chill that clings to your skin, making it uncomfortable for traveling as it combines the cool air with a sense of heaviness, leaving you yearning for warmth and dryness.

December Average Humidity in Harleyville

This chart illustrates the average monthly humidity levels in Harleyville, 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 Harleyville 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 Harleyville

In Harleyville 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 Harleyville for better planning.

Maximum UV Index Levels in Harleyville for December

The chart shows the monthly maximum UV Index (UVI) for Harleyville 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 Harleyville typically reaches 4, which falls under the moderate exposure category.

Data source: Harleyville 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 Harleyville Compares to Other Months

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

This table compares monthly weather conditions in Harleyville, 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 (50°F)	73 mm (2.9 inches)	86%	moderate
February Weather	13°C (56°F)	98 mm (3.9 inches)	81%	high
March Weather	15°C (59°F)	75 mm (3.0 inches)	81%	very high
April Weather	19°C (66°F)	109 mm (4.3 inches)	79%	very high
May Weather	23°C (74°F)	96 mm (3.8 inches)	75%	extreme
June Weather	26°C (79°F)	122 mm (4.8 inches)	75%	extreme
July Weather	27°C (82°F)	166 mm (6.6 inches)	80%	extreme
August Weather	27°C (81°F)	144 mm (5.7 inches)	81%	extreme
September Weather	25°C (78°F)	117 mm (4.6 inches)	83%	very high
October Weather	21°C (70°F)	64 mm (2.5 inches)	78%	very high
November Weather	14°C (57°F)	66 mm (2.6 inches)	85%	high
December Weather	11°C (53°F)	135 mm (5.3 inches)	87%	moderate