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December Weather in Wilmington, United States

Last updated: June 24, 2025

In December, the average temperature in Wilmington, United States hovers around -4°C (25°F). You can expect chilly extremes, with temperatures dipping as low as -28°C (-18°F) and peaking at a milder 14°C (57°F). This month sees approximately 78 mm (3.1 in) of precipitation spread over 13 days, contributing to a notable average humidity of 89%.

December Temperature in Wilmington

In December in Wilmington, the average temperature is -4°C (25°F). Maximums can reach 14°C (57°F), and minimums can be as low as -28°C (-18°F). Be prepared for significant temperature fluctuations and dress in layers for your travels.

December Weather in Wilmington: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Wilmington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wilmington, December typically has an average temperature of -4°C (25°F), with highs reaching up to 14°C (57°F) and lows dropping to around -28°C (-18°F).
JanFebMarAprMayJunJulAugSepOctNovDec182128415463696759483424
Data source: Temperature data for Wilmington generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Wilmington

In Wilmington in December, the precipitation amount is 78 mm (3.1 in) spread over 13 days.

December Precipitation Trends in Wilmington

The chart displays monthly precipitation patterns in Wilmington, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Wilmington, December typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec81837811396105115976714310378
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Wilmington

In Wilmington in December humidity is 89%. With an average temperature of -4°C (25°F), this humidity feels like an intense chill that seeps into your bones, making traveling uncomfortable as you navigate through the damp, cold air.

December Average Humidity in Wilmington

This chart illustrates the average monthly humidity levels in Wilmington, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Wilmington is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Wilmington

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.

Maximum UV Index Levels in Wilmington for December

The chart shows the monthly maximum UV Index (UVI) for Wilmington in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Wilmington typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Wilmington December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Wilmington Compares to Other Months

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.

This table compares monthly weather conditions in Wilmington, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (19°F)81 mm (3.2 inches)93%low
February Weather-6°C (21°F)83 mm (3.3 inches)92%moderate
March Weather-2°C (28°F)78 mm (3.1 inches)86%moderate
April Weather5°C (41°F)113 mm (4.4 inches)85%very high
May Weather12°C (55°F)96 mm (3.8 inches)80%very high
June Weather17°C (63°F)105 mm (4.1 inches)74%very high
July Weather21°C (69°F)115 mm (4.5 inches)76%very high
August Weather19°C (67°F)97 mm (3.8 inches)75%very high
September Weather15°C (60°F)67 mm (2.7 inches)78%high
October Weather9°C (48°F)143 mm (5.6 inches)86%moderate
November Weather1°C (34°F)102 mm (4.0 inches)88%moderate
December Weather-4°C (25°F)78 mm (3.1 inches)89%low

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