Last updated: June 24, 2025
In December, the average temperature in Dover, United States hovers around -4°C (25°F), with a minimum dipping to a brisk -26°C (-14°F) and a maximum reaching a mild 18°C (65°F). During this month, expect 42 mm (1.7 in) of precipitation spread over 7 days. The air remains quite humid, with an average humidity of 82%, adding to the chill in the air.
In December in Dover, the average temperature is -4°C (25°F), with maximums reaching 18°C (65°F) and minimums dropping as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures and dress accordingly for the cold weather.
In Dover in December, the total precipitation amount is 42 mm (1.7 in) over the course of 7 days.
In Dover in December, humidity is 82%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating warm, layered clothing to shield against the damp cold.
In Dover 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 Dover, you can visit Hourly UV Index in Dover.
UV Risk Categories
Weather in Dover varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Dover, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 36 mm (1.4 inches) | 84% | moderate |
| February Weather | -8°C (19°F) | 47 mm (1.9 inches) | 85% | moderate |
| March Weather | 1°C (34°F) | 58 mm (2.3 inches) | 84% | moderate |
| April Weather | 6°C (44°F) | 87 mm (3.4 inches) | 83% | very high |
| May Weather | 15°C (59°F) | 145 mm (5.7 inches) | 75% | very high |
| June Weather | 21°C (71°F) | 139 mm (5.5 inches) | 79% | very high |
| July Weather | 23°C (73°F) | 99 mm (3.9 inches) | 75% | very high |
| August Weather | 21°C (70°F) | 122 mm (4.8 inches) | 69% | very high |
| September Weather | 18°C (64°F) | 121 mm (4.8 inches) | 74% | very high |
| October Weather | 9°C (48°F) | 113 mm (4.5 inches) | 79% | moderate |
| November Weather | 1°C (34°F) | 49 mm (1.9 inches) | 88% | moderate |
| December Weather | -4°C (25°F) | 42 mm (1.7 inches) | 82% | low |