nomadseason

December Weather in Jena, United States

Last updated: June 24, 2025

In December, the average temperature in Jena, United States is a mild 12°C (54°F). Temperatures can vary significantly, with a chilly minimum of -3°C (28°F) and a warm maximum reaching 28°C (83°F). Expect 127 mm (5.0 in) of precipitation spread over 10 days, accompanied by high average humidity at 88%.

December Temperature in Jena

In December in Jena, the average temperature is 12°C (54°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -3°C (28°F). This diverse range of temperatures makes it important to pack for both warm days and chilly nights when traveling.

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

The chart illustrates December temperature patterns in Jena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jena, December typically has an average temperature of 12°C (54°F), with highs reaching up to 28°C (83°F) and lows dropping to around -3°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec505462667580828279705753
Data source: Temperature data for Jena generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Jena

In Jena in December, the precipitation amount is 127 mm (5.0 in), spread over a period of 10 days.

December Precipitation Trends in Jena

The chart displays monthly precipitation patterns in Jena, 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 Jena, December typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec11315511114716413312413011111975127
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Jena

In Jena in December, humidity is 88%. With an average temperature of 12°C (54°F), this humidity feels like a thick, damp blanket, making traveling a bit uncomfortable as the air clings to your skin, causing you to sweat even in cooler weather.

December Average Humidity in Jena

This chart illustrates the average monthly humidity levels in Jena, 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 Jena is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%83%80%81%81%78%79%79%79%77%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Jena

In Jena in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Jena for better planning.

Maximum UV Index Levels in Jena for December

The chart shows the monthly maximum UV Index (UVI) for Jena 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 Jena typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111112121110864
Data source: Jena 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 Jena Compares to Other Months

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

This table compares monthly weather conditions in Jena, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)113 mm (4.4 inches)83%moderate
February Weather12°C (54°F)155 mm (6.1 inches)83%high
March Weather17°C (63°F)111 mm (4.4 inches)80%very high
April Weather19°C (66°F)147 mm (5.8 inches)81%extreme
May Weather24°C (75°F)164 mm (6.5 inches)81%extreme
June Weather27°C (80°F)133 mm (5.2 inches)78%extreme
July Weather28°C (83°F)124 mm (4.9 inches)79%extreme
August Weather28°C (83°F)130 mm (5.1 inches)79%extreme
September Weather26°C (79°F)111 mm (4.4 inches)79%very high
October Weather21°C (70°F)119 mm (4.7 inches)77%very high
November Weather14°C (57°F)75 mm (3.0 inches)85%high
December Weather12°C (54°F)127 mm (5.0 inches)88%moderate

Compare Jena's Climate with Cities Worldwide