December Weather in Altenahr, Germany

Last updated: August 23, 2025

In December, the average temperature in Altenahr, Germany hovers around 4°C (39°F), with minimums dipping to a chilly -5°C (23°F) and maximums reaching a mild 14°C (57°F). During this period, expect around 90 mm (3.5 in) of precipitation spread over 17 days, contributing to a notably high average humidity of 92%. Plan accordingly as the weather can be quite unpredictable!

December Temperature in Altenahr

In December in Altenahr, the average temperature is 4°C (39°F). The maximum can reach 14°C (57°F), and the minimum can be as low as -5°C (23°F). It's a good idea to pack warm layers and prepare for varying weather conditions while traveling to Altenahr.

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

The chart illustrates December temperature patterns in Altenahr, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altenahr, December typically has an average temperature of 4°C (39°F), with highs reaching up to 14°C (57°F) and lows dropping to around -5°C (23°F).

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

December Precipitation in Altenahr

In Altenahr in December, the precipitation amount is 90 mm (3.5 in) spread over 17 days.

December Precipitation Trends in Altenahr

The chart displays monthly precipitation patterns in Altenahr, 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 Altenahr, December typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 17 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 Altenahr

In Altenahr in December humidity is 92%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and travel feel burdensome as you navigate through the thick, muggy air.

December Average Humidity in Altenahr

This chart illustrates the average monthly humidity levels in Altenahr, 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 Altenahr is approximately 92%, 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 Altenahr

In Altenahr in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Altenahr.

Maximum UV Index Levels in Altenahr for December

The chart shows the monthly maximum UV Index (UVI) for Altenahr 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 Altenahr typically reaches 1, which falls under the low exposure category.

Data source: Altenahr 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 Altenahr Compares to Other Months

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

This table compares monthly weather conditions in Altenahr, 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)	63 mm (2.5 inches)	91%	low
February Weather	4°C (39°F)	59 mm (2.3 inches)	90%	moderate
March Weather	6°C (43°F)	68 mm (2.7 inches)	87%	moderate
April Weather	9°C (49°F)	39 mm (1.5 inches)	84%	moderate
May Weather	13°C (55°F)	83 mm (3.3 inches)	77%	very high
June Weather	18°C (64°F)	86 mm (3.4 inches)	74%	very high
July Weather	18°C (65°F)	87 mm (3.4 inches)	72%	very high
August Weather	18°C (65°F)	81 mm (3.2 inches)	71%	high
September Weather	15°C (58°F)	53 mm (2.1 inches)	81%	high
October Weather	11°C (52°F)	61 mm (2.4 inches)	88%	moderate
November Weather	6°C (43°F)	48 mm (1.9 inches)	91%	low
December Weather	4°C (39°F)	90 mm (3.5 inches)	92%	low