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December Weather in Mutsu, Japan

Last updated: August 23, 2025

In December, the average temperature in Mutsu, Japan hovers around 4°C (39°F), with a minimum dipping to -4°C (25°F) and a maximum reaching 15°C (58°F). Expect relatively high humidity at 77%, alongside 202 mm (8.0 in) of precipitation spread over 27 days this month. Be prepared for a mix of chilly days and occasional rain!

December Temperature in Mutsu

In December in Mutsu, the average temperature is 4°C (39°F), with maximums reaching 15°C (58°F) and minimums plummeting to as low as -4°C (25°F). Travellers should prepare for a chilly climate and pack layers to stay comfortable during their visit.

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

The chart illustrates December temperature patterns in Mutsu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mutsu, December typically has an average temperature of 4°C (39°F), with highs reaching up to 15°C (58°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec343339455359667168604938
Data source: Temperature data for Mutsu 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 Mutsu

In Mutsu in December, the precipitation amount is 202 mm (8.0 in) over the course of 27 days.

December Precipitation Trends in Mutsu

The chart displays monthly precipitation patterns in Mutsu, 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 Mutsu, December typically receives around 202 mm (8.0 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec130129939597114109193113170118203
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mutsu

In Mutsu 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 Mutsu

This chart illustrates the average monthly humidity levels in Mutsu, 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 Mutsu is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%77%78%86%91%95%97%89%82%78%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mutsu

In Mutsu 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 Mutsu, you can visit Hourly UV Index in Mutsu.

Maximum UV Index Levels in Mutsu for December

The chart shows the monthly maximum UV Index (UVI) for Mutsu 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 Mutsu typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec345891010118642
Data source: Mutsu 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 Mutsu Compares to Other Months

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

This table compares monthly weather conditions in Mutsu, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)130 mm (5.1 inches)79%moderate
February Weather1°C (33°F)129 mm (5.1 inches)78%moderate
March Weather4°C (39°F)93 mm (3.7 inches)77%moderate
April Weather7°C (45°F)95 mm (3.7 inches)78%very high
May Weather11°C (53°F)97 mm (3.8 inches)86%very high
June Weather15°C (59°F)114 mm (4.5 inches)91%very high
July Weather19°C (67°F)109 mm (4.3 inches)95%very high
August Weather22°C (71°F)193 mm (7.6 inches)97%extreme
September Weather20°C (69°F)113 mm (4.5 inches)89%very high
October Weather16°C (60°F)170 mm (6.7 inches)81%high
November Weather10°C (49°F)118 mm (4.7 inches)78%moderate
December Weather4°C (39°F)202 mm (8.0 inches)77%low

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