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December Weather in Shiojiri, Japan

Last updated: August 23, 2025

In December, the average temperature in Shiojiri, Japan hovers around 1°C (34°F), with a minimum that can drop to -9°C (16°F) and a maximum reaching up to 16°C (62°F). Expect about 84 mm (3.3 in) of precipitation spread over 12 days, contributing to an average humidity of 78%.

December Temperature in Shiojiri

In December in Shiojiri, the average temperature is 1°C (34°F). Maximum temperatures can reach 16°C (62°F), while the minimum can drop as low as -9°C (16°F). This range of temperatures suggests that travelers should dress in layers to stay comfortable during fluctuating conditions.

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

The chart illustrates December temperature patterns in Shiojiri, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shiojiri, December typically has an average temperature of 1°C (34°F), with highs reaching up to 16°C (62°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec293040485864727466564434
Data source: Temperature data for Shiojiri 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 Shiojiri

In Shiojiri in December, the precipitation amount is 84 mm (3.3 in) over a span of 12 days.

December Precipitation Trends in Shiojiri

The chart displays monthly precipitation patterns in Shiojiri, 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 Shiojiri, December typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec75811411441551492891511712376684
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Shiojiri

In Shiojiri in December, humidity is 78%. With an average temperature of 1°C (34°F), this humidity feels like an extra layer of chill in the air, making travel uncomfortable and damp, often leading to a persistent sense of cold that can seep into your bones, leaving you wishing for a warm shelter.

December Average Humidity in Shiojiri

This chart illustrates the average monthly humidity levels in Shiojiri, 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 Shiojiri is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%74%70%74%82%88%93%90%86%83%80%78%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Shiojiri

In Shiojiri in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Shiojiri for better planning.

Maximum UV Index Levels in Shiojiri for December

The chart shows the monthly maximum UV Index (UVI) for Shiojiri 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 Shiojiri typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101111121210754
Data source: Shiojiri 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 Shiojiri Compares to Other Months

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

This table compares monthly weather conditions in Shiojiri, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)75 mm (3.0 inches)76%moderate
February Weather-1°C (30°F)80 mm (3.2 inches)74%high
March Weather4°C (40°F)141 mm (5.6 inches)70%very high
April Weather9°C (48°F)143 mm (5.6 inches)74%very high
May Weather15°C (58°F)155 mm (6.1 inches)81%extreme
June Weather18°C (65°F)149 mm (5.8 inches)88%extreme
July Weather22°C (72°F)289 mm (11.4 inches)93%extreme
August Weather23°C (74°F)151 mm (5.9 inches)90%extreme
September Weather19°C (66°F)171 mm (6.7 inches)86%very high
October Weather13°C (56°F)237 mm (9.3 inches)83%high
November Weather7°C (44°F)66 mm (2.6 inches)80%moderate
December Weather1°C (34°F)84 mm (3.3 inches)78%moderate

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