January Weather in Dayton, United States

Last updated: June 24, 2025

In January, the average temperature in Dayton, United States is a brisk 2°C (35°F). This month can see a minimum of -17°C (1°F) and a maximum of 20°C (69°F), showcasing a diverse range of conditions. Expect 63 mm (2.5 in) of precipitation spread over 8 days, with an average humidity of 84%, making for a chilly yet intriguing climate.

January Temperature in Dayton

In January in Dayton, the average temperature is 2°C (35°F), with maximums reaching up to 20°C (69°F) and minimums plunging as low as -17°C (1°F). Be prepared for a wide range of temperatures when planning your travels 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 2°C (35°F), with highs reaching up to 20°C (69°F) and lows dropping to around -17°C (1°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 precipitation amount is 63 mm (2.5 in) spread over 8 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 63 mm (2.5 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Dayton

In Dayton in January, humidity is 84%. With an average temperature of 2°C (35°F), this humidity feels like an uncomfortable chill that penetrates your bones, making outdoor travel quite brisk and uninviting.

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 84%, 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 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 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 3, which falls under the moderate 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	2°C (35°F)	63 mm (2.5 inches)	84%	moderate
February Weather	3°C (39°F)	109 mm (4.3 inches)	82%	moderate
March Weather	6°C (44°F)	107 mm (4.2 inches)	81%	high
April Weather	12°C (54°F)	107 mm (4.2 inches)	78%	very high
May Weather	17°C (63°F)	127 mm (5.0 inches)	69%	very high
June Weather	23°C (73°F)	97 mm (3.8 inches)	69%	very high
July Weather	26°C (79°F)	138 mm (5.4 inches)	62%	very high
August Weather	25°C (76°F)	131 mm (5.2 inches)	65%	very high
September Weather	21°C (71°F)	88 mm (3.5 inches)	68%	very high
October Weather	16°C (61°F)	132 mm (5.2 inches)	74%	high
November Weather	8°C (47°F)	83 mm (3.3 inches)	82%	moderate
December Weather	4°C (39°F)	102 mm (4.0 inches)	80%	low