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December Weather in Appalachia, United States

Last updated: June 24, 2025

In Appalachia, United States, the average temperature for December hovers around 4°C (40°F), with potential extremes ranging from a brisk -14°C (7°F) to a mild 20°C (68°F). Be prepared for about 127 mm (5.0 in) of precipitation over approximately 12 days, and expect a high average humidity of 88%, making the atmosphere feel almost tropical despite the chill.

December Temperature in Appalachia

In December in Appalachia, the average temperature is 4°C (40°F). Maximums can reach 20°C (68°F), while minimums can drop as low as -14°C (7°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates December temperature patterns in Appalachia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Appalachia, December typically has an average temperature of 4°C (40°F), with highs reaching up to 20°C (68°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec364146546469737168584440
Data source: Temperature data for Appalachia 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 Appalachia

In Appalachia in December, the precipitation amount is 127 mm (5.0 in) occurring over the course of 12 days.

December Precipitation Trends in Appalachia

The chart displays monthly precipitation patterns in Appalachia, 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 Appalachia, December typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec9518013516014614713114712113978127
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Appalachia

In Appalachia in December, humidity is 88%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration less enjoyable and prompting you to seek cozy indoor activities instead.

December Average Humidity in Appalachia

This chart illustrates the average monthly humidity levels in Appalachia, 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 Appalachia is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Appalachia

In Appalachia 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 Appalachia, you can check the information here.

Maximum UV Index Levels in Appalachia for December

The chart shows the monthly maximum UV Index (UVI) for Appalachia 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 Appalachia typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3689111111109753
Data source: Appalachia 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 Appalachia Compares to Other Months

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

This table compares monthly weather conditions in Appalachia, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)95 mm (3.7 inches)88%moderate
February Weather5°C (41°F)180 mm (7.1 inches)88%high
March Weather8°C (47°F)135 mm (5.3 inches)87%very high
April Weather12°C (54°F)160 mm (6.3 inches)84%very high
May Weather18°C (64°F)146 mm (5.8 inches)84%extreme
June Weather21°C (69°F)147 mm (5.8 inches)83%extreme
July Weather23°C (73°F)130 mm (5.1 inches)79%extreme
August Weather22°C (72°F)147 mm (5.8 inches)66%very high
September Weather20°C (68°F)121 mm (4.8 inches)67%very high
October Weather15°C (58°F)139 mm (5.5 inches)76%high
November Weather7°C (44°F)78 mm (3.1 inches)89%moderate
December Weather4°C (40°F)127 mm (5.0 inches)88%moderate

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