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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 a minimum dipping as low as -14°C (8°F) and a maximum reaching 18°C (64°F). Expect moderate precipitation of 78 mm (3.1 in) spread over about 14 days, contributing to an average humidity of 86%. Be prepared for a chilly and damp atmosphere!

December Temperature in Dayton

In December in Dayton, the average temperature is 1°C (34°F), with maximums reaching up to 18°C (64°F) and minimums dipping as low as -14°C (8°F). Be prepared for a wide range of temperatures if you plan to travel 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 1°C (34°F), with highs reaching up to 18°C (64°F) and lows dropping to around -14°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec353441485765747262494134
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 78 mm (3.1 in) over a period of 14 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 78 mm (3.1 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec671057158543041526577478
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 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
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 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Dayton, you can visit Hourly UV Index in Dayton.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467991097532
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 (35°F)67 mm (2.7 inches)85%low
February Weather1°C (34°F)105 mm (4.1 inches)86%moderate
March Weather5°C (42°F)71 mm (2.8 inches)86%high
April Weather9°C (48°F)58 mm (2.3 inches)82%high
May Weather14°C (57°F)53 mm (2.1 inches)77%very high
June Weather18°C (65°F)30 mm (1.2 inches)79%very high
July Weather23°C (74°F)4 mm (0.1 inches)77%very high
August Weather22°C (73°F)15 mm (0.6 inches)62%very high
September Weather17°C (63°F)26 mm (1.0 inches)60%high
October Weather10°C (49°F)57 mm (2.3 inches)80%moderate
November Weather5°C (41°F)74 mm (2.9 inches)87%moderate
December Weather1°C (34°F)78 mm (3.1 inches)86%low

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