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December Weather in Fort Smith, United States

Last updated: June 24, 2025

In December, the average temperature in Fort Smith, United States hovers around 7°C (46°F). Expect a minimum temperature dipping to -8°C (19°F) and a maximum reaching up to 25°C (77°F). During this time, precipitation averages 98 mm (3.9 in) over the course of 8 days, with humidity levels around 87%. Stay prepared for a mix of cool to warm days as well as some wet weather!

December Temperature in Fort Smith

In December, in Fort Smith, the average temperature is 7°C (46°F). Maximum temperatures can reach 25°C (77°F), while minimums can plummet to -8°C (19°F). Be sure to pack layers for your trip, as the weather can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Fort Smith, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort Smith, December typically has an average temperature of 7°C (46°F), with highs reaching up to 25°C (77°F) and lows dropping to around -8°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec404354596978817975625045
Data source: Temperature data for Fort Smith 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 Smith

In Fort Smith in December, the total precipitation amount is 98 mm (3.9 in), occurring over 8 days.

December Precipitation Trends in Fort Smith

The chart displays monthly precipitation patterns in Fort Smith, 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 Smith, December typically receives around 98 mm (3.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec981231421572139198132781518798
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fort Smith

In Fort Smith in December humidity is 87%. With an average temperature of 7°C (46°F), this humidity feels like a chilly embrace, making traveling uncomfortable as the dampness seeps through layers of clothing, leaving you feeling cold and clammy.

December Average Humidity in Fort Smith

This chart illustrates the average monthly humidity levels in Fort Smith, 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 Smith is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Fort Smith

In Fort Smith 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 Fort Smith for better planning.

Maximum UV Index Levels in Fort Smith for December

The chart shows the monthly maximum UV Index (UVI) for Fort Smith 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 Smith typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710111111109754
Data source: Fort Smith 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 Smith Compares to Other Months

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

This table compares monthly weather conditions in Fort Smith, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)98 mm (3.9 inches)82%moderate
February Weather6°C (43°F)123 mm (4.8 inches)79%high
March Weather12°C (54°F)141 mm (5.6 inches)77%high
April Weather15°C (60°F)157 mm (6.2 inches)78%very high
May Weather21°C (70°F)213 mm (8.4 inches)82%extreme
June Weather25°C (78°F)91 mm (3.6 inches)81%extreme
July Weather27°C (81°F)98 mm (3.8 inches)75%extreme
August Weather26°C (79°F)132 mm (5.2 inches)61%very high
September Weather24°C (76°F)78 mm (3.1 inches)59%very high
October Weather17°C (63°F)151 mm (5.9 inches)69%high
November Weather10°C (50°F)87 mm (3.4 inches)82%moderate
December Weather7°C (46°F)98 mm (3.9 inches)87%moderate

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