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December Weather in Dayton, United States

Last updated: June 24, 2025

In December, the average temperature in Dayton, United States is a cool 7°C (45°F). Expect temperatures to range from a minimum of -10°C (15°F) to a maximum of 22°C (73°F). With an average humidity of 88%, you might find it feels quite damp. Additionally, prepare for 140 mm (5.5 in) of precipitation spread over 11 days, so don't forget your umbrella!

December Temperature in Dayton

In December in Dayton, the average temperature is 7°C (45°F). Maximums can reach 22°C (73°F) and minimums can drop as low as -10°C (15°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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 7°C (45°F), with highs reaching up to 22°C (73°F) and lows dropping to around -10°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec414652596975797773634945
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 total precipitation amount is 140 mm (5.5 in), occurring over a span of 11 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 140 mm (5.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec10317317416613311913713710512974140
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 88%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through a heavy, thick atmosphere that clings to your skin.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
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 Weather5°C (42°F)103 mm (4.0 inches)87%moderate
February Weather8°C (47°F)173 mm (6.8 inches)87%high
March Weather11°C (53°F)173 mm (6.8 inches)85%very high
April Weather15°C (59°F)166 mm (6.5 inches)82%very high
May Weather21°C (69°F)133 mm (5.2 inches)83%extreme
June Weather24°C (75°F)119 mm (4.7 inches)82%extreme
July Weather26°C (79°F)137 mm (5.4 inches)78%extreme
August Weather25°C (77°F)137 mm (5.4 inches)67%very high
September Weather23°C (74°F)105 mm (4.1 inches)64%very high
October Weather17°C (64°F)129 mm (5.1 inches)74%high
November Weather9°C (49°F)74 mm (2.9 inches)87%moderate
December Weather7°C (45°F)140 mm (5.5 inches)88%moderate

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