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December Weather in Kosaka, Japan

Last updated: August 23, 2025

In December, the average temperature in Kosaka, Japan hovers around -1°C (30°F). Expect chilly conditions, with minimums dipping as low as -11°C (12°F) and maximums reaching up to 12°C (54°F). Be prepared for 114 mm (4.5 in) of precipitation spread over 23 days, adding to the month’s crisp atmosphere. With an average humidity of 77%, it's a time to embrace warm layers and cozy settings.

December Temperature in Kosaka

In December in Kosaka, the average temperature is -1°C (30°F). The maximum can reach 12°C (54°F), while the minimum can drop as low as -11°C (12°F). Be sure to pack warm clothing and prepare for chilly conditions if you're traveling during this time.

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

The chart illustrates December temperature patterns in Kosaka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kosaka, December typically has an average temperature of -1°C (30°F), with highs reaching up to 12°C (54°F) and lows dropping to around -11°C (12°F).
JanFebMarAprMayJunJulAugSepOctNovDec262735455763717265534230
Data source: Temperature data for Kosaka 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 Kosaka

In Kosaka, in December, the precipitation amount is 114 mm (4.5 in) over a span of 23 days.

December Precipitation Trends in Kosaka

The chart displays monthly precipitation patterns in Kosaka, 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 Kosaka, December typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec78108107127116142168179137166100114
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Kosaka

In Kosaka in December humidity is 77%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that penetrates your layers, making it crucial to bundle up tightly during your travels.

December Average Humidity in Kosaka

This chart illustrates the average monthly humidity levels in Kosaka, 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 Kosaka 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 Kosaka

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

Maximum UV Index Levels in Kosaka for December

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

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

This table compares monthly weather conditions in Kosaka, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)78 mm (3.1 inches)79%moderate
February Weather-3°C (28°F)108 mm (4.3 inches)78%moderate
March Weather2°C (35°F)107 mm (4.2 inches)77%high
April Weather7°C (45°F)127 mm (5.0 inches)78%very high
May Weather14°C (57°F)116 mm (4.6 inches)86%very high
June Weather17°C (63°F)142 mm (5.6 inches)91%very high
July Weather22°C (71°F)168 mm (6.6 inches)95%very high
August Weather22°C (73°F)179 mm (7.1 inches)97%extreme
September Weather18°C (65°F)137 mm (5.4 inches)89%very high
October Weather12°C (54°F)166 mm (6.5 inches)81%high
November Weather6°C (42°F)100 mm (4.0 inches)78%moderate
December Weather-1°C (30°F)114 mm (4.5 inches)77%low

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