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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 3°C (38°F). Expect chilly nights with a minimum of -14°C (7°F), while daytime highs can reach up to 19°C (67°F). During this time, 85 mm (3.3 in) of precipitation typically falls over 8 days, and humidity remains high at an average of 85%. Be prepared for a mix of cold and wet conditions!

December Temperature in Dayton

In December in Dayton, the average temperature is 3°C (38°F). Maximum temperatures can reach 19°C (67°F), while minimums can drop as low as -14°C (7°F). Be prepared for a wide range of weather conditions when traveling to Dayton during this time.

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 3°C (38°F), with highs reaching up to 19°C (67°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec333843536370757267574338
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 85 mm (3.3 in) over the course of 8 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 85 mm (3.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec64906910712899761151121127085
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 85%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable as you contend with the heavy, cold air surrounding you.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
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 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 Dayton, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
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 (33°F)64 mm (2.5 inches)86%moderate
February Weather4°C (39°F)90 mm (3.6 inches)86%high
March Weather6°C (44°F)69 mm (2.7 inches)86%high
April Weather12°C (53°F)107 mm (4.2 inches)84%very high
May Weather17°C (63°F)128 mm (5.0 inches)78%extreme
June Weather21°C (70°F)99 mm (3.9 inches)79%extreme
July Weather24°C (75°F)76 mm (3.0 inches)70%extreme
August Weather22°C (72°F)115 mm (4.5 inches)59%very high
September Weather19°C (67°F)112 mm (4.4 inches)68%very high
October Weather14°C (58°F)112 mm (4.4 inches)80%high
November Weather6°C (43°F)70 mm (2.7 inches)86%moderate
December Weather3°C (38°F)85 mm (3.3 inches)85%moderate

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