December Weather in Germantown, United States

Last updated: June 24, 2025

In Germantown, United States, the average temperature in December is a cool 4°C (40°F). Be prepared for a range of temperatures, with a minimum of -11°C (12°F) and a maximum of 19°C (67°F). During this time, expect approximately 95 mm (3.7 in) of precipitation spread over 9 days, contributing to an average humidity of 84%.

December Temperature in Germantown

In December in Germantown, the average temperature is 4°C (40°F). The maximum can reach 19°C (67°F) and the minimum can be as low as -11°C (12°F). Be prepared for a wide temperature range if you're planning to travel during this time.

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

The chart illustrates December temperature patterns in Germantown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Germantown, December typically has an average temperature of 4°C (40°F), with highs reaching up to 19°C (67°F) and lows dropping to around -11°C (12°F).

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

December Precipitation in Germantown

In Germantown in December, the precipitation amount is 95 mm (3.7 in) over the course of 9 days.

December Precipitation Trends in Germantown

The chart displays monthly precipitation patterns in Germantown, 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 Germantown, December typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Germantown

In Germantown in December, humidity is 84%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and requiring extra layers to stay warm and dry while traveling.

December Average Humidity in Germantown

This chart illustrates the average monthly humidity levels in Germantown, 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 Germantown 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 Germantown

In Germantown 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 Germantown, you can check the information here.

Maximum UV Index Levels in Germantown for December

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

Data source: Germantown 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 Germantown Compares to Other Months

Weather in Germantown varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Germantown, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Germantown, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	59 mm (2.3 inches)	84%	moderate
February Weather	4°C (40°F)	96 mm (3.8 inches)	83%	moderate
March Weather	7°C (45°F)	89 mm (3.5 inches)	83%	high
April Weather	13°C (56°F)	96 mm (3.8 inches)	81%	very high
May Weather	18°C (65°F)	138 mm (5.4 inches)	78%	very high
June Weather	23°C (74°F)	129 mm (5.1 inches)	79%	very high
July Weather	26°C (80°F)	154 mm (6.1 inches)	74%	very high
August Weather	25°C (77°F)	134 mm (5.3 inches)	72%	very high
September Weather	21°C (71°F)	105 mm (4.2 inches)	75%	very high
October Weather	16°C (61°F)	104 mm (4.1 inches)	81%	high
November Weather	8°C (46°F)	88 mm (3.5 inches)	85%	moderate
December Weather	4°C (40°F)	95 mm (3.7 inches)	84%	moderate