January Weather in Dayton, United States

Last updated: June 24, 2025

In Dayton, United States, the average temperature in January hovers around 1°C (33°F), with a notable range from a chilling -26°C (-15°F) to a mild 20°C (68°F). Expect 64 mm (2.5 in) of precipitation spread over 8 days, contributing to an overall average humidity of 86%. 🥶🌧️

January Temperature in Dayton

In January in Dayton, the average temperature is 1°C (33°F). The maximum can reach 20°C (68°F), and the minimum can be as low as -26°C (-15°F). Travelers should be prepared for a wide range of temperatures, from chilly days to unexpectedly warm ones.

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 (33°F), with highs reaching up to 20°C (68°F) and lows dropping to around -26°C (-15°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 64 mm (2.5 in) over the course of 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 64 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 86%. With average temperature 1°C (33°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating extra layers for warmth to counteract the dampness in the 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 86%, 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	1°C (33°F)	64 mm (2.5 inches)	86%	moderate
February Weather	4°C (39°F)	90 mm (3.6 inches)	86%	high
March Weather	6°C (44°F)	69 mm (2.7 inches)	86%	high
April Weather	12°C (53°F)	107 mm (4.2 inches)	84%	very high
May Weather	17°C (63°F)	128 mm (5.0 inches)	78%	extreme
June Weather	21°C (70°F)	99 mm (3.9 inches)	79%	extreme
July Weather	24°C (75°F)	76 mm (3.0 inches)	70%	extreme
August Weather	22°C (72°F)	115 mm (4.5 inches)	59%	very high
September Weather	19°C (67°F)	112 mm (4.4 inches)	68%	very high
October Weather	14°C (58°F)	112 mm (4.4 inches)	80%	high
November Weather	6°C (43°F)	70 mm (2.7 inches)	86%	moderate
December Weather	3°C (38°F)	85 mm (3.3 inches)	85%	moderate