January Weather in Dayton, United States

Last updated: June 24, 2025

In January, the average temperature in Dayton, United States hovers around 1°C (35°F), with a minimum low of -19°C (-2°F) and a maximum high reaching 13°C (56°F). The region experiences 67 mm (2.7 in) of precipitation over approximately 12 days, resulting in an average humidity of 85%. Prepare for chilly days and occasional wet weather!

January Temperature in Dayton

In January in Dayton, the average temperature is 1°C (35°F), with a maximum that can reach 13°C (56°F) and a minimum that can drop as low as -19°C (-2°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable during their visit.

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 1°C (35°F), with highs reaching up to 13°C (56°F) and lows dropping to around -19°C (-2°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 67 mm (2.7 in) over the course of 12 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 67 mm (2.7 inches) of precipitation spread over approximately 12 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 85%. With an average temperature of 1°C (35°F), this humidity feels like a chilly blanket wrapping around you, making outdoor adventures damp and uncomfortable, especially for travelers unprepared for such a heavy and cold atmosphere.

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	1°C (35°F)	67 mm (2.7 inches)	85%	low
February Weather	1°C (34°F)	105 mm (4.1 inches)	86%	moderate
March Weather	5°C (42°F)	71 mm (2.8 inches)	86%	high
April Weather	9°C (48°F)	58 mm (2.3 inches)	82%	high
May Weather	14°C (57°F)	53 mm (2.1 inches)	77%	very high
June Weather	18°C (65°F)	30 mm (1.2 inches)	79%	very high
July Weather	23°C (74°F)	4 mm (0.1 inches)	77%	very high
August Weather	22°C (73°F)	15 mm (0.6 inches)	62%	very high
September Weather	17°C (63°F)	26 mm (1.0 inches)	60%	high
October Weather	10°C (49°F)	57 mm (2.3 inches)	80%	moderate
November Weather	5°C (41°F)	74 mm (2.9 inches)	87%	moderate
December Weather	1°C (34°F)	78 mm (3.1 inches)	86%	low