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December Weather in Yaotsu, Japan

Last updated: August 23, 2025

In December, the average temperature in Yaotsu, Japan hovers around 5°C (41°F), with a range that dips as low as -3°C (27°F) and peaks at 18°C (66°F). Expect about 83 mm (3.3 in) of precipitation over 10 days, contributing to an average humidity level of 83%.

December Temperature in Yaotsu

In December in Yaotsu, the average temperature is 5°C (41°F). The maximum can reach 18°C (66°F) and the minimum can be as low as -3°C (27°F). It's important to pack layers and be prepared for varying weather conditions while traveling during this time.

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

The chart illustrates December temperature patterns in Yaotsu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yaotsu, December typically has an average temperature of 5°C (41°F), with highs reaching up to 18°C (66°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec373846546369767972625041
Data source: Temperature data for Yaotsu 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 Yaotsu

In Yaotsu in December, the total precipitation amount is 83 mm (3.3 in) over a span of 10 days.

December Precipitation Trends in Yaotsu

The chart displays monthly precipitation patterns in Yaotsu, 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 Yaotsu, December typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec72921652072182204832702412197783
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Yaotsu

In Yaotsu in December humidity is 83%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and necessitating extra layers to stay warm and dry.

December Average Humidity in Yaotsu

This chart illustrates the average monthly humidity levels in Yaotsu, 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 Yaotsu is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%74%76%83%87%93%91%87%85%83%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Yaotsu

In Yaotsu 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 Yaotsu for better planning.

Maximum UV Index Levels in Yaotsu for December

The chart shows the monthly maximum UV Index (UVI) for Yaotsu 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 Yaotsu typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121110754
Data source: Yaotsu 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 Yaotsu Compares to Other Months

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

This table compares monthly weather conditions in Yaotsu, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)72 mm (2.9 inches)82%moderate
February Weather3°C (38°F)92 mm (3.6 inches)79%high
March Weather8°C (46°F)165 mm (6.5 inches)74%very high
April Weather12°C (54°F)207 mm (8.1 inches)76%very high
May Weather17°C (63°F)218 mm (8.6 inches)83%extreme
June Weather21°C (70°F)220 mm (8.7 inches)87%extreme
July Weather25°C (77°F)483 mm (19.0 inches)93%extreme
August Weather26°C (80°F)270 mm (10.6 inches)91%extreme
September Weather22°C (72°F)241 mm (9.5 inches)87%very high
October Weather17°C (62°F)219 mm (8.6 inches)85%high
November Weather10°C (51°F)77 mm (3.0 inches)83%moderate
December Weather5°C (41°F)83 mm (3.3 inches)83%moderate

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