Last updated: June 24, 2025
In January, the average temperature in Dayton, United States hovers around -6°C (21°F), with extremes ranging from a chilly -31°C (-23°F) to a mild 13°C (55°F). During this month, you can expect 32 mm (1.3 in) of precipitation spread over about 6 days, contributing to an average humidity of 82%. Stay warm and dry!
In January in Dayton, the average temperature is -6°C (21°F). The maximum can reach 13°C (55°F), while the minimum can drop as low as -31°C (-23°F). Be prepared for significant temperature fluctuations if you plan to travel during this time.
In Dayton in January, the total precipitation amount is 32 mm (1.3 in) over the course of 6 days.
In Dayton in January, humidity is 82%. With an average temperature of -6°C (21°F), this humidity feels like a chilling embrace that cuts through layers of clothing, making outdoor exploration feel even more invigorating yet biting, urging travelers to seek refuge indoors or bundle up tightly for brief adventures outside.
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.
UV Risk Categories
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.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -6°C (21°F) | 32 mm (1.3 inches) | 82% | moderate |
February Weather | -6°C (21°F) | 42 mm (1.7 inches) | 84% | moderate |
March Weather | 3°C (38°F) | 72 mm (2.8 inches) | 80% | moderate |
April Weather | 9°C (48°F) | 72 mm (2.8 inches) | 81% | very high |
May Weather | 16°C (62°F) | 166 mm (6.5 inches) | 74% | very high |
June Weather | 23°C (74°F) | 109 mm (4.3 inches) | 80% | extreme |
July Weather | 24°C (76°F) | 89 mm (3.5 inches) | 80% | very high |
August Weather | 23°C (73°F) | 95 mm (3.8 inches) | 77% | very high |
September Weather | 20°C (68°F) | 127 mm (5.0 inches) | 75% | very high |
October Weather | 11°C (51°F) | 123 mm (4.8 inches) | 80% | high |
November Weather | 3°C (37°F) | 41 mm (1.6 inches) | 87% | moderate |
December Weather | -2°C (29°F) | 37 mm (1.5 inches) | 83% | moderate |