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December Weather in Tenno, Japan

Last updated: August 23, 2025

In December, the average temperature in Tenno, Japan hovers around 4°C (40°F). Prepare for a journey of contrasts, as temperatures can dip as low as -5°C (24°F) and peak at a comfortable 15°C (59°F). Be ready for wet weather too—with an average precipitation of 171 mm (6.7 in) spread over 26 days. The air tends to be quite humid, sitting at an average of 78%.

December Temperature in Tenno

In December in Tenno, the average temperature is 4°C (40°F). The maximum can reach 15°C (59°F), and the minimum can be as low as -5°C (24°F). Be prepared for chilly conditions and pack layers to stay comfortable during your travels.

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

The chart illustrates December temperature patterns in Tenno, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tenno, December typically has an average temperature of 4°C (40°F), with highs reaching up to 15°C (59°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec353542506067767872615039
Data source: Temperature data for Tenno 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 Tenno

In Tenno in December, the total precipitation amount is 171 mm (6.7 in) spread over 26 days.

December Precipitation Trends in Tenno

The chart displays monthly precipitation patterns in Tenno, 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 Tenno, December typically receives around 171 mm (6.7 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec94112105121127147163210156192145171
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Tenno

In Tenno in December, humidity is 78%. With an average temperature of 4°C (40°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities quite uncomfortable and travel less enjoyable as you navigate through the cold, damp air.

December Average Humidity in Tenno

This chart illustrates the average monthly humidity levels in Tenno, 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 Tenno is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%76%78%86%90%93%92%84%80%76%78%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Tenno

In Tenno in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Tenno, you can visit Hourly UV Index in Tenno.

Maximum UV Index Levels in Tenno for December

The chart shows the monthly maximum UV Index (UVI) for Tenno 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 Tenno typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346891010119642
Data source: Tenno 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 Tenno Compares to Other Months

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

This table compares monthly weather conditions in Tenno, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)94 mm (3.7 inches)79%moderate
February Weather2°C (35°F)112 mm (4.4 inches)78%moderate
March Weather6°C (43°F)105 mm (4.1 inches)76%high
April Weather10°C (50°F)121 mm (4.8 inches)78%very high
May Weather16°C (60°F)127 mm (5.0 inches)86%very high
June Weather20°C (67°F)147 mm (5.8 inches)90%very high
July Weather24°C (76°F)163 mm (6.4 inches)93%very high
August Weather26°C (79°F)210 mm (8.3 inches)92%extreme
September Weather22°C (72°F)156 mm (6.1 inches)84%very high
October Weather16°C (61°F)192 mm (7.6 inches)80%high
November Weather10°C (51°F)145 mm (5.7 inches)76%moderate
December Weather4°C (40°F)171 mm (6.7 inches)78%low

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