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December Weather in Dayton, United States

Last updated: June 24, 2025

In December, the average temperature in Dayton, United States hovers around 1°C (34°F), with potential extremes ranging from a chilly -14°C (8°F) to a mild 15°C (60°F). Expect a total precipitation of approximately 49 mm (1.9 in) spread over about 7 days, contributing to the region's high average humidity of 82%.

December Temperature in Dayton

In December in Dayton, the average temperature is 1°C (34°F). Maximums can reach 15°C (60°F), while minimums can drop as low as -14°C (8°F). Travelers should prepare for a wide range of temperatures and dress in layers to stay comfortable.

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

The chart illustrates December temperature patterns in Dayton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dayton, December typically has an average temperature of 1°C (34°F), with highs reaching up to 15°C (60°F) and lows dropping to around -14°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec343541505869777667524334
Data source: Temperature data for Dayton 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 Dayton

In Dayton in December, the precipitation amount is 49 mm (1.9 in) over the course of 7 days.

December Precipitation Trends in Dayton

The chart displays monthly precipitation patterns in Dayton, 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 Dayton, December typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec73705226266896293049
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Dayton

In Dayton in December humidity is 82%. With an average temperature of 1°C (34°F), this humidity feels like walking through a thick fog, making it challenging to stay warm and comfortable while traveling.

December Average Humidity in Dayton

This chart illustrates the average monthly humidity levels in Dayton, 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 Dayton is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%87%84%78%64%56%44%34%41%60%81%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Dayton

In Dayton 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 Dayton for better planning.

Maximum UV Index Levels in Dayton for December

The chart shows the monthly maximum UV Index (UVI) for Dayton 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 Dayton typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110754
Data source: Dayton 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 Dayton Compares to Other Months

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

This table compares monthly weather conditions in Dayton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)73 mm (2.9 inches)85%moderate
February Weather2°C (36°F)70 mm (2.8 inches)87%high
March Weather5°C (41°F)52 mm (2.1 inches)84%very high
April Weather10°C (50°F)25 mm (1.0 inches)78%very high
May Weather14°C (58°F)26 mm (1.0 inches)64%extreme
June Weather21°C (69°F)6 mm (0.2 inches)56%extreme
July Weather25°C (78°F)8 mm (0.3 inches)44%extreme
August Weather24°C (76°F)9 mm (0.3 inches)34%extreme
September Weather19°C (67°F)6 mm (0.2 inches)41%very high
October Weather11°C (53°F)29 mm (1.1 inches)60%high
November Weather6°C (43°F)30 mm (1.2 inches)81%moderate
December Weather1°C (34°F)49 mm (1.9 inches)82%moderate

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