January Weather in Dayton, United States

Last updated: June 24, 2025

In January, the average temperature in Dayton, United States hovers around 6°C (43°F). You can expect temperatures to range from a chilly -9°C (16°F) to a mild 15°C (59°F). With 158 mm (6.2 in) of precipitation falling over 16 days, it's advisable to carry an umbrella. The atmosphere tends to be quite damp, with an average humidity of 85%.

January Temperature in Dayton

In January in Dayton, the average temperature is 6°C (43°F). Maximum temperatures can reach 15°C (59°F), while minimums can dip as low as -9°C (16°F). Be prepared for a mix of chilly and milder days when traveling during this time.

January Weather in Dayton: Daily Temperature Highs, Lows, and Averages

The chart illustrates January 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, January typically has an average temperature of 6°C (43°F), with highs reaching up to 15°C (59°F) and lows dropping to around -9°C (16°F).

Data source: Temperature data for Dayton generated using information from the Copernicus Climate Change Service.

January Precipitation in Dayton

In Dayton in January, the total precipitation amount is 158 mm (6.2 in) that occurs over a span of 16 days.

January Precipitation Trends in Dayton

The chart displays monthly precipitation patterns in Dayton, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Dayton, January typically receives around 158 mm (6.2 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Dayton

In Dayton in January, humidity is 85%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making travel feel more uncomfortable and limiting your enjoyment of the sights as you navigate the wet, brisk air.

January Average Humidity in Dayton

This chart illustrates the average monthly humidity levels in Dayton, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Dayton is approximately 85%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Dayton

In Dayton in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Dayton in January, 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 January, the maximum UV index in Dayton typically reaches 2, which falls under the low exposure category.

Data source: Dayton January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	158 mm (6.2 inches)	85%	low
February Weather	5°C (42°F)	163 mm (6.4 inches)	84%	moderate
March Weather	8°C (47°F)	121 mm (4.8 inches)	85%	moderate
April Weather	11°C (52°F)	105 mm (4.1 inches)	83%	high
May Weather	15°C (58°F)	48 mm (1.9 inches)	83%	very high
June Weather	18°C (65°F)	39 mm (1.5 inches)	83%	very high
July Weather	21°C (71°F)	4 mm (0.2 inches)	82%	very high
August Weather	22°C (71°F)	4 mm (0.2 inches)	74%	very high
September Weather	18°C (65°F)	57 mm (2.3 inches)	71%	high
October Weather	12°C (54°F)	91 mm (3.6 inches)	81%	moderate
November Weather	8°C (47°F)	144 mm (5.7 inches)	87%	moderate
December Weather	5°C (42°F)	182 mm (7.2 inches)	87%	low