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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 14°C (58°F), with a minimum drop to -2°C (29°F) and a pleasant peak at 28°C (82°F). Expect about 117 mm (4.6 in) of precipitation spread over 9 days, contributing to an average humidity of 84%. It's a month that beautifully balances warmth with refreshing rain!

December Temperature in Dayton

In December in Dayton, the average temperature is 14°C (58°F), with maximums reaching as high as 28°C (82°F) and minimums dropping to as low as -2°C (29°F). Be prepared for a wide range of temperatures, ensuring you pack layers for both warm and chilly moments during your travels.

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 14°C (58°F), with highs reaching up to 28°C (82°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec545765697681838380726257
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 117 mm (4.6 in) spread over a period 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 117 mm (4.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9310210010618817114220821711679117
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 84%. With an average temperature of 14°C (58°F), this humidity feels like a heavy blanket enveloping you, making every step feel sluggish and damp, which can be uncomfortable for 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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%81%76%79%79%74%72%68%73%75%78%84%
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 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the 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 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111111110965
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 Weather12°C (54°F)93 mm (3.7 inches)78%moderate
February Weather14°C (58°F)102 mm (4.0 inches)81%very high
March Weather18°C (65°F)100 mm (3.9 inches)76%very high
April Weather21°C (69°F)106 mm (4.2 inches)79%extreme
May Weather25°C (77°F)188 mm (7.4 inches)79%extreme
June Weather27°C (81°F)171 mm (6.7 inches)74%extreme
July Weather28°C (83°F)142 mm (5.6 inches)71%extreme
August Weather28°C (83°F)208 mm (8.2 inches)68%extreme
September Weather26°C (80°F)217 mm (8.5 inches)73%very high
October Weather22°C (72°F)116 mm (4.6 inches)75%very high
November Weather16°C (62°F)79 mm (3.1 inches)78%high
December Weather14°C (58°F)117 mm (4.6 inches)84%moderate

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