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December Weather in Shiroishi, Japan

Last updated: August 23, 2025

In December, the average temperature in Shiroishi, Japan hovers around 2°C (36°F), with a potential dip to a chilly -8°C (18°F) and a maximum of 17°C (63°F). Be prepared for wet weather too, as 87 mm (3.4 in) of precipitation falls over 18 days on average, accompanied by a high humidity of 77%.

December Temperature in Shiroishi

In December in Shiroishi, the average temperature is 2°C (36°F), with maximums reaching 17°C (63°F) and minimums dipping as low as -8°C (18°F). Be prepared for a wide range of temperatures and dress in layers for your travels.

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

The chart illustrates December temperature patterns in Shiroishi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shiroishi, December typically has an average temperature of 2°C (36°F), with highs reaching up to 17°C (63°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec313241496066737668574636
Data source: Temperature data for Shiroishi 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 Shiroishi

In Shiroishi in December, the total precipitation amount is 87 mm (3.4 in) over the course of 18 days.

December Precipitation Trends in Shiroishi

The chart displays monthly precipitation patterns in Shiroishi, 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 Shiroishi, December typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec79691121091061002451831401944687
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Shiroishi

In Shiroishi in December, humidity is 77%. With an average temperature of 2°C (36°F), this humidity feels like a chilly embrace, making every breath feel damp and cold, which can be challenging for traveling but adds an invigorating layer to the experience.

December Average Humidity in Shiroishi

This chart illustrates the average monthly humidity levels in Shiroishi, 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 Shiroishi is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Shiroishi

In Shiroishi 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 Shiroishi, you can check the information here.

Maximum UV Index Levels in Shiroishi for December

The chart shows the monthly maximum UV Index (UVI) for Shiroishi 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 Shiroishi typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101011119643
Data source: Shiroishi 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 Shiroishi Compares to Other Months

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

This table compares monthly weather conditions in Shiroishi, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)79 mm (3.1 inches)76%moderate
February Weather0°C (33°F)69 mm (2.7 inches)75%moderate
March Weather5°C (41°F)112 mm (4.4 inches)72%high
April Weather9°C (49°F)109 mm (4.3 inches)73%very high
May Weather16°C (60°F)106 mm (4.2 inches)80%very high
June Weather19°C (66°F)100 mm (3.9 inches)87%very high
July Weather23°C (74°F)245 mm (9.6 inches)92%extreme
August Weather24°C (76°F)183 mm (7.2 inches)90%extreme
September Weather20°C (68°F)140 mm (5.5 inches)84%very high
October Weather14°C (58°F)194 mm (7.6 inches)80%high
November Weather8°C (47°F)46 mm (1.8 inches)77%moderate
December Weather2°C (36°F)87 mm (3.4 inches)77%moderate

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