Last updated: June 24, 2025
In Dayton, United States, the average temperature in December hovers around -2°C (29°F). However, temperatures can vary significantly, dipping as low as -23°C (-9°F) and reaching up to a pleasant 22°C (71°F). During this month, you can expect an average precipitation of 37 mm (1.5 in) over approximately 5 days, accompanied by a high humidity level of 83%.
In December in Dayton, the average temperature is -2°C (29°F), with maximums reaching 22°C (71°F) and minimums plummeting as low as -23°C (-9°F). Be prepared for a wide range of temperatures when traveling to Dayton during this time, ensuring you pack appropriate clothing for both the cold and warmer days.
In Dayton in December, the precipitation amount is 37 mm (1.5 in) spread over a period of 5 days.
In Dayton in December, humidity is 83%. With an average temperature of -2°C (29°F), this humidity feels like a biting chill that seeps into your bones, making travel outside feel particularly uncomfortable and brisk, as the damp air enhances the cold sensation, leaving you longing for warmth and shelter.
In Dayton in December, 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 December’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 |