December Weather in Dover, United States

Last updated: June 24, 2025

In Dover, United States, the average temperature for December hovers around 5°C (42°F), with fluctuations that can dip to a chilly -10°C (15°F) or rise to a pleasant 20°C (68°F). Expect about 97 mm (3.8 in) of precipitation over 9 days, contributing to an average humidity of 84%. Stay prepared for a mix of crisp air and frequent showers during this time!

December Temperature in Dover

In December in Dover, the average temperature is 5°C (42°F). The maximum can reach 20°C (68°F) and the minimum can be as low as -10°C (15°F). Travelers should be prepared for a wide range of temperatures, bringing layers for both warm and chilly conditions.

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

The chart illustrates December temperature patterns in Dover, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dover, December typically has an average temperature of 5°C (42°F), with highs reaching up to 20°C (68°F) and lows dropping to around -10°C (15°F).

Data source: Temperature data for Dover generated using information from the Copernicus Climate Change Service.

December Precipitation in Dover

In Dover in December, the total precipitation amount reaches 97 mm (3.8 in) over the course of 9 days.

December Precipitation Trends in Dover

The chart displays monthly precipitation patterns in Dover, 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 Dover, December typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Dover

In Dover in December, humidity is 84%. With an average temperature of 5°C (42°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier while traveling.

December Average Humidity in Dover

This chart illustrates the average monthly humidity levels in Dover, 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 Dover is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Dover

In Dover 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 Dover, you can check the information here.

Maximum UV Index Levels in Dover for December

The chart shows the monthly maximum UV Index (UVI) for Dover 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 Dover typically reaches 3, which falls under the moderate exposure category.

Data source: Dover 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 Dover Compares to Other Months

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.

This table compares monthly weather conditions in Dover, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	59 mm (2.3 inches)	84%	moderate
February Weather	5°C (41°F)	99 mm (3.9 inches)	83%	moderate
March Weather	8°C (46°F)	105 mm (4.1 inches)	83%	high
April Weather	13°C (56°F)	96 mm (3.8 inches)	81%	very high
May Weather	18°C (65°F)	127 mm (5.0 inches)	78%	very high
June Weather	24°C (75°F)	106 mm (4.2 inches)	79%	very high
July Weather	27°C (80°F)	144 mm (5.7 inches)	74%	very high
August Weather	25°C (78°F)	183 mm (7.2 inches)	72%	very high
September Weather	22°C (72°F)	96 mm (3.8 inches)	75%	very high
October Weather	17°C (63°F)	121 mm (4.8 inches)	81%	high
November Weather	9°C (49°F)	78 mm (3.1 inches)	85%	moderate
December Weather	5°C (42°F)	97 mm (3.8 inches)	84%	moderate