Last updated: June 24, 2025
In December, the average temperature in Wilmington, United States hovers around 1°C (34°F). However, be prepared for fluctuations, as temperatures can drop to a chilly -19°C (-3°F) or climb to a mild 17°C (63°F). The month brings about 119 mm (4.7 in) of precipitation spread over 10 days, contributing to an average humidity level of 81%. Whether you're braving the cold or enjoying the brief warm spells, it's a month rich in varied weather!
In December in Wilmington, the average temperature is 1°C (34°F). The maximum can reach 17°C (63°F), and the minimum can be as low as -19°C (-3°F). Be prepared for a wide range of temperatures when traveling to Wilmington this month.
In Wilmington in December, the total precipitation amount is 119 mm (4.7 in) over the span of 10 days.
In Wilmington in December humidity is 81%. With an average temperature of 1°C (34°F), this humidity feels like a damp chill wrapping around you, making traveling uncomfortable as every breath feels heavy and the cold penetration intensifies with the moisture in the air.
In Wilmington 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 Wilmington, you can visit Hourly UV Index in Wilmington.
UV Risk Categories
Weather in Wilmington varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Wilmington, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 71 mm (2.8 inches) | 86% | moderate |
| February Weather | 0°C (33°F) | 87 mm (3.4 inches) | 84% | moderate |
| March Weather | 3°C (38°F) | 89 mm (3.5 inches) | 82% | moderate |
| April Weather | 9°C (48°F) | 127 mm (5.0 inches) | 80% | very high |
| May Weather | 15°C (59°F) | 86 mm (3.4 inches) | 72% | very high |
| June Weather | 20°C (69°F) | 85 mm (3.4 inches) | 72% | very high |
| July Weather | 23°C (74°F) | 125 mm (4.9 inches) | 67% | very high |
| August Weather | 23°C (74°F) | 79 mm (3.1 inches) | 66% | very high |
| September Weather | 19°C (67°F) | 79 mm (3.1 inches) | 71% | high |
| October Weather | 13°C (56°F) | 132 mm (5.2 inches) | 78% | high |
| November Weather | 6°C (43°F) | 95 mm (3.7 inches) | 84% | moderate |
| December Weather | 1°C (34°F) | 119 mm (4.7 inches) | 81% | low |