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December Weather in Komatsu, Japan

Last updated: August 23, 2025

In December, the average temperature in Komatsu, Japan is a cool 7°C (46°F), with a minimum dip to -3°C (26°F) and a pleasant maximum reaching 21°C (70°F). Expect 240 mm (9.5 in) of precipitation spread over 24 days, contributing to an average humidity of 79%. Whether you're preparing for rain or enjoying the mild temperature, be ready for the charm of a Komatsu winter!

December Temperature in Komatsu

In December in Komatsu, the average temperature is 7°C (46°F). Maximums can reach 21°C (70°F), while minimums can drop as low as -3°C (26°F). Be prepared for a wide range of temperatures, making it advisable to pack layers for your travels.

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

The chart illustrates December temperature patterns in Komatsu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Komatsu, December typically has an average temperature of 7°C (46°F), with highs reaching up to 21°C (70°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec404147546470788174655545
Data source: Temperature data for Komatsu 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 Komatsu

In Komatsu in December, the total precipitation amount is 240 mm (9.5 in) spread over 24 days.

December Precipitation Trends in Komatsu

The chart displays monthly precipitation patterns in Komatsu, 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 Komatsu, December typically receives around 240 mm (9.5 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec195162145161124147286237213191147240
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Komatsu

In Komatsu in December, humidity is 79%. With an average temperature of 7°C (46°F), this humidity feels like a damp chill that seeps into your bones, making any outdoor activity somewhat uncomfortable and urging travelers to dress in layers to stay warm and dry.

December Average Humidity in Komatsu

This chart illustrates the average monthly humidity levels in Komatsu, 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 Komatsu is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%76%77%85%89%93%92%84%81%77%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Komatsu

In Komatsu 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 Komatsu, you can check the information here.

Maximum UV Index Levels in Komatsu for December

The chart shows the monthly maximum UV Index (UVI) for Komatsu 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 Komatsu typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec45810101111119753
Data source: Komatsu 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 Komatsu Compares to Other Months

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

This table compares monthly weather conditions in Komatsu, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (40°F)195 mm (7.7 inches)80%moderate
February Weather5°C (41°F)162 mm (6.4 inches)78%moderate
March Weather8°C (47°F)145 mm (5.7 inches)76%very high
April Weather12°C (54°F)161 mm (6.3 inches)77%very high
May Weather18°C (64°F)124 mm (4.9 inches)85%very high
June Weather21°C (70°F)147 mm (5.8 inches)89%extreme
July Weather26°C (78°F)286 mm (11.3 inches)93%extreme
August Weather27°C (82°F)237 mm (9.3 inches)92%extreme
September Weather23°C (74°F)213 mm (8.4 inches)84%very high
October Weather18°C (65°F)191 mm (7.5 inches)81%high
November Weather13°C (55°F)147 mm (5.8 inches)77%moderate
December Weather7°C (46°F)240 mm (9.5 inches)79%moderate

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