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December Weather in Fort Mill, United States

Last updated: June 24, 2025

In Fort Mill, United States, the average temperature in December hovers around 9°C (48°F), with lows dipping to -7°C (19°F) and peaks reaching as high as 26°C (79°F). Expect 124 mm (4.9 in) of precipitation over approximately 9 days, accompanied by a high average humidity of 87%. Perfect your packing to stay comfortable in this variable climate!

December Temperature in Fort Mill

In December in Fort Mill, the average temperature is 9°C (48°F), with maximums reaching up to 26°C (79°F) and minimums dropping as low as -7°C (19°F). Travelers should be prepared for a wide range of temperatures during this time.

December Weather in Fort Mill: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Fort Mill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort Mill, December typically has an average temperature of 9°C (48°F), with highs reaching up to 26°C (79°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec445054637177817975655247
Data source: Temperature data for Fort Mill 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 Fort Mill

In Fort Mill in December, the precipitation amount is 124 mm (4.9 in) over the course of 9 days.

December Precipitation Trends in Fort Mill

The chart displays monthly precipitation patterns in Fort Mill, 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 Fort Mill, December typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9312089104106791011141288790124
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fort Mill

In Fort Mill in December humidity is 87%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and requiring extra layers and careful planning for any activities.

December Average Humidity in Fort Mill

This chart illustrates the average monthly humidity levels in Fort Mill, 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 Fort Mill is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Fort Mill

In Fort Mill 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 Fort Mill, you can check the information here.

Maximum UV Index Levels in Fort Mill for December

The chart shows the monthly maximum UV Index (UVI) for Fort Mill 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 Fort Mill typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109853
Data source: Fort Mill 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 Fort Mill Compares to Other Months

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

This table compares monthly weather conditions in Fort Mill, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)93 mm (3.7 inches)86%moderate
February Weather10°C (50°F)120 mm (4.7 inches)85%high
March Weather12°C (55°F)89 mm (3.5 inches)84%very high
April Weather17°C (63°F)104 mm (4.1 inches)82%very high
May Weather22°C (72°F)106 mm (4.2 inches)83%very high
June Weather25°C (77°F)79 mm (3.1 inches)82%extreme
July Weather27°C (81°F)101 mm (4.0 inches)80%extreme
August Weather26°C (79°F)114 mm (4.5 inches)74%very high
September Weather24°C (75°F)128 mm (5.0 inches)75%very high
October Weather19°C (66°F)87 mm (3.4 inches)79%very high
November Weather11°C (52°F)90 mm (3.5 inches)87%moderate
December Weather9°C (48°F)124 mm (4.9 inches)87%moderate

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