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December Weather in Koshimizu, Japan

Last updated: August 23, 2025

In Koshimizu, Japan, the average temperature in December hovers around -3°C (27°F). Temperatures can dip as low as -14°C (6°F) or rise to a maximum of 12°C (54°F). Expect 70 mm (2.8 in) of precipitation spread across 13 days, contributing to a fairly high average humidity of 79%. Stay warm and hydrated!

December Temperature in Koshimizu

In December in Koshimizu, the average temperature is -3°C (27°F). The maximum can reach 12°C (54°F), while the minimum can drop as low as -14°C (6°F). Be sure to pack warm clothing and prepare for chilly conditions if you plan to visit during this time.

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

The chart illustrates December temperature patterns in Koshimizu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koshimizu, December typically has an average temperature of -3°C (27°F), with highs reaching up to 12°C (54°F) and lows dropping to around -14°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec191828395056646561513926
Data source: Temperature data for Koshimizu 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 Koshimizu

In Koshimizu in December, the precipitation amount is 70 mm (2.8 in) spread over 13 days.

December Precipitation Trends in Koshimizu

The chart displays monthly precipitation patterns in Koshimizu, 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 Koshimizu, December typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec54558872959679129951599670
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Koshimizu

In Koshimizu in December, humidity is 79%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm.

December Average Humidity in Koshimizu

This chart illustrates the average monthly humidity levels in Koshimizu, 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 Koshimizu is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%83%86%88%93%96%89%83%80%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Koshimizu

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

Maximum UV Index Levels in Koshimizu for December

The chart shows the monthly maximum UV Index (UVI) for Koshimizu 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 Koshimizu typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2367891098532
Data source: Koshimizu 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 Koshimizu Compares to Other Months

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

This table compares monthly weather conditions in Koshimizu, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)54 mm (2.1 inches)84%low
February Weather-8°C (19°F)55 mm (2.2 inches)83%moderate
March Weather-2°C (29°F)88 mm (3.5 inches)83%high
April Weather4°C (39°F)72 mm (2.8 inches)83%high
May Weather10°C (50°F)95 mm (3.7 inches)86%very high
June Weather13°C (56°F)96 mm (3.8 inches)88%very high
July Weather18°C (64°F)79 mm (3.1 inches)93%very high
August Weather18°C (65°F)129 mm (5.1 inches)96%very high
September Weather16°C (61°F)95 mm (3.7 inches)89%very high
October Weather11°C (51°F)159 mm (6.2 inches)83%moderate
November Weather4°C (40°F)96 mm (3.8 inches)80%moderate
December Weather-3°C (27°F)70 mm (2.8 inches)79%low

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