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December Weather in Koseda, Japan

Last updated: August 23, 2025

In Koseda, Japan, the average temperature in December typically hovers around 15°C (60°F). Expect minimums reaching 7°C (45°F) and maximums peaking at 24°C (75°F). While you're enjoying the mild climate, be prepared for 132 mm (5.2 in) of rainfall spread across approximately 13 days, and a humidity level averaging 74%.

December Temperature in Koseda

In December in Koseda, the average temperature is 15°C (60°F), with maximums reaching 24°C (75°F) and minimums dropping to as low as 7°C (45°F). This mild weather makes Koseda an ideal destination for outdoor activities and exploration during this time of year.

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

The chart illustrates December temperature patterns in Koseda, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koseda, December typically has an average temperature of 15°C (60°F), with highs reaching up to 24°C (75°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec565661657175818280746759
Data source: Temperature data for Koseda 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 Koseda

In Koseda in December, the precipitation amount is 132 mm (5.2 in) over the course of 13 days.

December Precipitation Trends in Koseda

The chart displays monthly precipitation patterns in Koseda, 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 Koseda, December typically receives around 132 mm (5.2 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec102151201172251469250200281173153132
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Koseda

In Koseda in December humidity is 74%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace that can make outdoor activities feel slightly stifling, so travelers should be prepared to hydrate frequently and take breaks in the shade.

December Average Humidity in Koseda

This chart illustrates the average monthly humidity levels in Koseda, 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 Koseda is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%68%72%79%83%86%90%85%80%78%76%75%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Koseda

In Koseda in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Koseda.

Maximum UV Index Levels in Koseda for December

The chart shows the monthly maximum UV Index (UVI) for Koseda 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 Koseda typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710111212131311875
Data source: Koseda 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 Koseda Compares to Other Months

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

This table compares monthly weather conditions in Koseda, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (56°F)102 mm (4.0 inches)72%moderate
February Weather13°C (56°F)151 mm (6.0 inches)68%high
March Weather16°C (61°F)201 mm (7.9 inches)72%very high
April Weather18°C (66°F)172 mm (6.8 inches)79%extreme
May Weather21°C (71°F)251 mm (9.9 inches)83%extreme
June Weather24°C (75°F)469 mm (18.5 inches)86%extreme
July Weather27°C (81°F)250 mm (9.8 inches)90%extreme
August Weather28°C (82°F)200 mm (7.9 inches)85%extreme
September Weather27°C (80°F)281 mm (11.1 inches)80%extreme
October Weather23°C (75°F)173 mm (6.8 inches)78%very high
November Weather19°C (67°F)153 mm (6.0 inches)76%high
December Weather15°C (60°F)132 mm (5.2 inches)74%moderate

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