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December Weather in Simpsonville, United States

Last updated: June 24, 2025

In December, the average temperature in Simpsonville, United States hovers around 5°C (41°F). Expect a minimum dip to -14°C (8°F) and a maximum rise to 21°C (71°F). This month brings about 116 mm (4.6 in) of precipitation over approximately 10 days, and the air tends to feel quite humid with an average humidity of 87%.

December Temperature in Simpsonville

In December in Simpsonville, the average temperature is 5°C (41°F), with maximums reaching 21°C (71°F) and minimums dropping as low as -14°C (8°F). Be prepared for a wide range of temperatures when traveling, so pack accordingly and enjoy your adventure!

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

The chart illustrates December temperature patterns in Simpsonville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Simpsonville, December typically has an average temperature of 5°C (41°F), with highs reaching up to 21°C (71°F) and lows dropping to around -14°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec353947556774787671604541
Data source: Temperature data for Simpsonville 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 Simpsonville

In Simpsonville in December, the total precipitation amount is 116 mm (4.6 in) over a span of 10 days.

December Precipitation Trends in Simpsonville

The chart displays monthly precipitation patterns in Simpsonville, 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 Simpsonville, December typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec9114014114612516810410012310790116
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Simpsonville

In Simpsonville in December humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

December Average Humidity in Simpsonville

This chart illustrates the average monthly humidity levels in Simpsonville, 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 Simpsonville is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Simpsonville

In Simpsonville 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 Simpsonville, you can check the information here.

Maximum UV Index Levels in Simpsonville for December

The chart shows the monthly maximum UV Index (UVI) for Simpsonville 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 Simpsonville typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108743
Data source: Simpsonville 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 Simpsonville Compares to Other Months

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

This table compares monthly weather conditions in Simpsonville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)91 mm (3.6 inches)87%moderate
February Weather4°C (40°F)140 mm (5.5 inches)85%moderate
March Weather9°C (48°F)141 mm (5.6 inches)86%high
April Weather13°C (56°F)145 mm (5.7 inches)84%very high
May Weather19°C (67°F)125 mm (4.9 inches)79%very high
June Weather23°C (74°F)168 mm (6.6 inches)82%very high
July Weather25°C (78°F)104 mm (4.1 inches)79%very high
August Weather24°C (76°F)100 mm (3.9 inches)70%very high
September Weather22°C (71°F)123 mm (4.8 inches)69%very high
October Weather16°C (60°F)107 mm (4.2 inches)76%high
November Weather7°C (45°F)90 mm (3.5 inches)88%moderate
December Weather5°C (41°F)116 mm (4.6 inches)87%moderate

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