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December Weather in Hartsville, United States

Last updated: June 24, 2025

In December, the average temperature in Hartsville, United States hovers around 7°C (45°F). Be prepared for a range, as temperatures can drop to a chilly -10°C (14°F) or soar to a pleasant 23°C (73°F). Expect 151 mm (6.0 in) of precipitation spread over about 11 days, with an average humidity of 88%, making the air feel rather moist throughout the month.

December Temperature in Hartsville

In December, in Hartsville, the average temperature is 7°C (45°F). The maximum can reach 23°C (73°F), and the minimum can be as low as -10°C (14°F). This diverse temperature range makes Hartsville an exciting destination for travelers seeking both cool and mild weather experiences.

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

The chart illustrates December temperature patterns in Hartsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartsville, December typically has an average temperature of 7°C (45°F), with highs reaching up to 23°C (73°F) and lows dropping to around -10°C (14°F).
JanFebMarAprMayJunJulAugSepOctNovDec404452597076807873634845
Data source: Temperature data for Hartsville 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 Hartsville

In Hartsville in December, the precipitation amount reaches 151 mm (6.0 in) over a span of 11 days.

December Precipitation Trends in Hartsville

The chart displays monthly precipitation patterns in Hartsville, 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 Hartsville, December typically receives around 151 mm (6.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec10618715714511914912211812014288151
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hartsville

In Hartsville in December humidity is 88%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through a heavy, thick atmosphere that clings to your skin.

December Average Humidity in Hartsville

This chart illustrates the average monthly humidity levels in Hartsville, 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 Hartsville is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hartsville

In Hartsville 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 Hartsville, you can check the information here.

Maximum UV Index Levels in Hartsville for December

The chart shows the monthly maximum UV Index (UVI) for Hartsville 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 Hartsville typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Hartsville 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 Hartsville Compares to Other Months

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

This table compares monthly weather conditions in Hartsville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)106 mm (4.2 inches)87%moderate
February Weather7°C (45°F)187 mm (7.4 inches)86%high
March Weather11°C (52°F)157 mm (6.2 inches)86%high
April Weather15°C (59°F)145 mm (5.7 inches)82%very high
May Weather21°C (70°F)119 mm (4.7 inches)82%very high
June Weather24°C (76°F)149 mm (5.9 inches)83%extreme
July Weather27°C (80°F)122 mm (4.8 inches)80%extreme
August Weather25°C (78°F)118 mm (4.7 inches)74%very high
September Weather23°C (74°F)120 mm (4.7 inches)71%very high
October Weather17°C (63°F)141 mm (5.6 inches)78%high
November Weather9°C (48°F)88 mm (3.5 inches)88%moderate
December Weather7°C (45°F)151 mm (6.0 inches)88%moderate

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