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December Weather in Hennef, Germany

Last updated: August 23, 2025

In December, the average temperature in Hennef, Germany hovers around 5°C (41°F), with a minimum dipping to -5°C (23°F) and a maximum reaching 15°C (59°F). Expect about 118 mm (4.7 in) of precipitation over approximately 20 days, coupled with a high average humidity of 92%. Make sure to prepare for a moist and chilly month!

December Temperature in Hennef

In December in Hennef, the average temperature is 5°C (41°F). The maximum can reach 15°C (59°F), while the minimum can drop as low as -5°C (23°F). It’s advisable to pack layered clothing to stay comfortable while exploring the area.

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

The chart illustrates December temperature patterns in Hennef, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hennef, December typically has an average temperature of 5°C (41°F), with highs reaching up to 15°C (59°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec374044505766676760534440
Data source: Temperature data for Hennef 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 Hennef

In Hennef in December, the total precipitation amount reaches 118 mm (4.7 in) over the course of 20 days.

December Precipitation Trends in Hennef

The chart displays monthly precipitation patterns in Hennef, 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 Hennef, December typically receives around 118 mm (4.7 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec8379853973679182618059118
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hennef

In Hennef in December humidity is 92%. With an average temperature of 5°C (41°F), this humidity feels like a cold, damp blanket enveloping you, making travel uncomfortable and dampening the spirits of those unprepared for the chill.

December Average Humidity in Hennef

This chart illustrates the average monthly humidity levels in Hennef, 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 Hennef is approximately 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%87%84%77%74%72%71%81%88%91%92%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hennef

In Hennef 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 Hennef.

Maximum UV Index Levels in Hennef for December

The chart shows the monthly maximum UV Index (UVI) for Hennef 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 Hennef typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Hennef 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 Hennef Compares to Other Months

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

This table compares monthly weather conditions in Hennef, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)83 mm (3.3 inches)91%low
February Weather4°C (40°F)79 mm (3.1 inches)90%low
March Weather7°C (44°F)85 mm (3.3 inches)87%moderate
April Weather10°C (50°F)39 mm (1.5 inches)84%moderate
May Weather14°C (57°F)73 mm (2.9 inches)77%high
June Weather19°C (66°F)67 mm (2.6 inches)74%very high
July Weather19°C (67°F)91 mm (3.6 inches)72%very high
August Weather19°C (67°F)82 mm (3.2 inches)71%high
September Weather15°C (60°F)61 mm (2.4 inches)81%moderate
October Weather12°C (53°F)80 mm (3.2 inches)88%moderate
November Weather7°C (44°F)59 mm (2.3 inches)91%low
December Weather5°C (41°F)118 mm (4.7 inches)92%low

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