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December Weather in Marumori, Japan

Last updated: August 23, 2025

In December, the average temperature in Marumori, Japan hovers around 4°C (39°F). Expect a chilly minimum of -4°C (25°F) and a mild maximum reaching up to 16°C (62°F). The month sees an average precipitation of 59 mm (2.3 in) spread over 13 days, contributing to an average humidity of 77%.

December Temperature in Marumori

In December in Marumori, the average temperature is 4°C (39°F). The maximum can reach 16°C (62°F), while the minimum can be as low as -4°C (25°F). It's advisable to pack layers and prepare for varying weather conditions when traveling during this time.

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

The chart illustrates December temperature patterns in Marumori, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marumori, December typically has an average temperature of 4°C (39°F), with highs reaching up to 16°C (62°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec343643506066737770604939
Data source: Temperature data for Marumori 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 Marumori

In Marumori in December, the precipitation amount is 59 mm (2.3 in) spread over 13 days.

December Precipitation Trends in Marumori

The chart displays monthly precipitation patterns in Marumori, 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 Marumori, December typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec58461121091161052522031732333759
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Marumori

In Marumori in December, humidity is 77%. With an average temperature of 4°C (39°F), this humidity feels like a brisk chill that seeps into your bones, making travel feel invigorating yet uncomfortable without proper layers to stay warm and dry.

December Average Humidity in Marumori

This chart illustrates the average monthly humidity levels in Marumori, 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 Marumori is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Marumori

In Marumori 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 Marumori, you can check the information here.

Maximum UV Index Levels in Marumori for December

The chart shows the monthly maximum UV Index (UVI) for Marumori 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 Marumori typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478101011109643
Data source: Marumori 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 Marumori Compares to Other Months

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

This table compares monthly weather conditions in Marumori, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)58 mm (2.3 inches)76%moderate
February Weather2°C (36°F)46 mm (1.8 inches)75%moderate
March Weather6°C (43°F)112 mm (4.4 inches)72%high
April Weather10°C (50°F)109 mm (4.3 inches)73%very high
May Weather16°C (61°F)116 mm (4.6 inches)80%very high
June Weather19°C (66°F)105 mm (4.1 inches)87%very high
July Weather23°C (74°F)252 mm (9.9 inches)92%extreme
August Weather25°C (77°F)203 mm (8.0 inches)90%very high
September Weather21°C (70°F)173 mm (6.8 inches)84%very high
October Weather15°C (60°F)233 mm (9.2 inches)80%high
November Weather10°C (49°F)37 mm (1.5 inches)77%moderate
December Weather4°C (39°F)59 mm (2.3 inches)77%moderate

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