Last updated: June 24, 2025
In Dayton, United States, the average temperature in December hovers around -5°C (23°F). However, be prepared for a chilly range, with minimums plummeting to -26°C (-15°F) and maximums reaching a more pleasant 12°C (55°F). Expect about 47 mm (1.8 in) of precipitation spread over 7 days, paired with an average humidity of 84%. Stay warm and dry!
In December in Dayton, the average temperature is -5°C (23°F). Maximums can reach 12°C (55°F), while minimums can drop as low as -26°C (-15°F). Be sure to pack warm clothing and prepare for a range of temperatures if you plan to travel during this month.
In Dayton in December, the precipitation amount is 47 mm (1.8 in) during a span of 7 days.
In Dayton in December, humidity is 84%. With an average temperature of -5°C (23°F), this humidity feels like an icy blanket wrapping around you, making the cold air bite even deeper and turning travel into a brisk, challenging adventure where each breath comes with a frosty reminder of the chill.
In Dayton in December, 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.
UV Risk Categories
Weather in Dayton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Dayton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -9°C (16°F) | 22 mm (0.9 inches) | 87% | low |
| February Weather | -9°C (16°F) | 29 mm (1.1 inches) | 90% | moderate |
| March Weather | 0°C (33°F) | 53 mm (2.1 inches) | 85% | moderate |
| April Weather | 6°C (43°F) | 93 mm (3.6 inches) | 84% | high |
| May Weather | 15°C (59°F) | 108 mm (4.2 inches) | 78% | very high |
| June Weather | 22°C (71°F) | 77 mm (3.0 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 99 mm (3.9 inches) | 81% | very high |
| August Weather | 21°C (71°F) | 144 mm (5.7 inches) | 81% | very high |
| September Weather | 18°C (64°F) | 112 mm (4.4 inches) | 81% | high |
| October Weather | 9°C (48°F) | 103 mm (4.1 inches) | 84% | moderate |
| November Weather | 0°C (33°F) | 34 mm (1.3 inches) | 88% | moderate |
| December Weather | -5°C (23°F) | 47 mm (1.8 inches) | 84% | low |