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December Weather in Dayton, United States

Last updated: June 24, 2025

In Dayton, United States, the average temperature in December hovers around 2°C (36°F). Be prepared for the extremes, as temperatures can dip to a chilly -25°C (-13°F) or soar up to a mild 18°C (64°F). This month, you can expect about 64 mm (2.5 in) of precipitation spread over 9 days, with an average humidity level of a soggy 86%. Stay warm and dry!

December Temperature in Dayton

In December in Dayton, the average temperature is 2°C (36°F). The maximum can reach 18°C (64°F) and the minimum can be as low as -25°C (-13°F). Travelers should be prepared for a wide range of temperatures, from chilly days to much warmer afternoons, making layered clothing essential.

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 2°C (36°F), with highs reaching up to 18°C (64°F) and lows dropping to around -25°C (-13°F).
JanFebMarAprMayJunJulAugSepOctNovDec293242526474777470574135
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 64 mm (2.5 in) over a span of 9 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 64 mm (2.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec778010792143959286631057664
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 2°C (36°F), this humidity feels like a biting chill that clings to your skin, making outdoor exploration uncomfortable and dampening any enthusiasm 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%85%86%87%81%82%81%79%78%81%89%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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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 Weather-2°C (29°F)76 mm (3.0 inches)85%moderate
February Weather0°C (32°F)79 mm (3.1 inches)85%moderate
March Weather6°C (42°F)107 mm (4.2 inches)86%high
April Weather11°C (52°F)92 mm (3.6 inches)87%very high
May Weather18°C (64°F)143 mm (5.6 inches)81%very high
June Weather23°C (74°F)95 mm (3.7 inches)82%very high
July Weather25°C (77°F)92 mm (3.6 inches)81%very high
August Weather23°C (74°F)86 mm (3.4 inches)79%very high
September Weather21°C (70°F)63 mm (2.5 inches)78%very high
October Weather14°C (58°F)105 mm (4.1 inches)81%high
November Weather5°C (42°F)76 mm (3.0 inches)89%moderate
December Weather2°C (36°F)64 mm (2.5 inches)86%low

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