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December Weather in Shonai, Japan

Last updated: August 23, 2025

In December, the average temperature in Shonai, Japan hovers around 3°C (37°F). While it's not uncommon to experience minimums as low as -6°C (22°F), you can also enjoy the occasional warmer day, with highs reaching 15°C (59°F). Expect a fair share of precipitation, totaling 241 mm (9.5 in) across 26 rainy days, and prepare for a damp atmosphere with an average humidity of 78%.

December Temperature in Shonai

In December in Shonai, the average temperature is 3°C (37°F). The maximum can reach 15°C (59°F), while the minimum can be as low as -6°C (22°F). Travelers should be prepared for chilly weather and pack layers to stay comfortable during their visit.

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

The chart illustrates December temperature patterns in Shonai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shonai, December typically has an average temperature of 3°C (37°F), with highs reaching up to 15°C (59°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec333340486066747769584837
Data source: Temperature data for Shonai 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 Shonai

In Shonai in December, the total precipitation amount is 241 mm (9.5 in) over the course of 26 days.

December Precipitation Trends in Shonai

The chart displays monthly precipitation patterns in Shonai, 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 Shonai, December typically receives around 241 mm (9.5 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec181171147144138147268269169190170241
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Shonai

In Shonai in December humidity is 78%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that penetrates your clothing, making it vital to bundle up while exploring the surroundings.

December Average Humidity in Shonai

This chart illustrates the average monthly humidity levels in Shonai, 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 Shonai is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%76%78%86%90%93%92%84%80%76%78%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Shonai

In Shonai 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 Shonai, you can check the information here.

Maximum UV Index Levels in Shonai for December

The chart shows the monthly maximum UV Index (UVI) for Shonai 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 Shonai typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346991011119643
Data source: Shonai 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 Shonai Compares to Other Months

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

This table compares monthly weather conditions in Shonai, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)181 mm (7.1 inches)79%moderate
February Weather1°C (34°F)171 mm (6.7 inches)78%moderate
March Weather4°C (40°F)147 mm (5.8 inches)76%high
April Weather9°C (49°F)144 mm (5.7 inches)78%very high
May Weather15°C (60°F)137 mm (5.4 inches)86%very high
June Weather19°C (67°F)147 mm (5.8 inches)90%very high
July Weather24°C (75°F)268 mm (10.5 inches)93%extreme
August Weather25°C (77°F)269 mm (10.6 inches)92%extreme
September Weather20°C (69°F)169 mm (6.6 inches)84%very high
October Weather15°C (59°F)190 mm (7.5 inches)80%high
November Weather9°C (48°F)169 mm (6.7 inches)76%moderate
December Weather3°C (37°F)241 mm (9.5 inches)78%moderate

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