Last updated: June 24, 2025
In December, the average temperature in Dayton, United States hovers around -3°C (27°F). Expect a chilly range where minimums can plummet to -23°C (-9°F), while maximums might reach a surprising 19°C (67°F). Don't forget your umbrella—precipitation amounts typically average 35 mm (1.4 in) over about 8 days. With an average humidity of 81%, the air can feel quite brisk!
In December in Dayton, the average temperature is -3°C (27°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -23°C (-9°F). Be prepared for a wide range of temperatures when traveling to Dayton during this time.
In Dayton in December, the precipitation amount is 35 mm (1.4 in) over the course of 8 days.
In Dayton in December humidity is 81%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making traveling uncomfortable and forcing you to bundle up tightly to fend off the cold dampness.
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 | -4°C (25°F) | 26 mm (1.0 inches) | 78% | moderate |
| February Weather | -7°C (20°F) | 45 mm (1.8 inches) | 79% | moderate |
| March Weather | 0°C (33°F) | 56 mm (2.2 inches) | 71% | high |
| April Weather | 4°C (39°F) | 97 mm (3.8 inches) | 70% | very high |
| May Weather | 10°C (50°F) | 109 mm (4.3 inches) | 75% | very high |
| June Weather | 16°C (61°F) | 84 mm (3.3 inches) | 82% | extreme |
| July Weather | 20°C (69°F) | 63 mm (2.5 inches) | 84% | very high |
| August Weather | 19°C (66°F) | 48 mm (1.9 inches) | 85% | very high |
| September Weather | 14°C (58°F) | 63 mm (2.5 inches) | 79% | very high |
| October Weather | 5°C (41°F) | 67 mm (2.6 inches) | 75% | moderate |
| November Weather | 0°C (33°F) | 37 mm (1.5 inches) | 75% | moderate |
| December Weather | -3°C (27°F) | 35 mm (1.4 inches) | 81% | low |