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December Weather in Ritto, Japan

Last updated: August 23, 2025

In December, the average temperature in Ritto, Japan hovers around 6°C (44°F), with a minimum dipping to -7°C (19°F) and a maximum reaching up to 22°C (72°F). Expect 63 mm (2.5 in) of precipitation over about 8 days, accompanied by a high average humidity of 83%. Whether you’re braving the chill or enjoying the milder days, be prepared for a mix of weather in this captivating destination!

December Temperature in Ritto

In December in Ritto, the average temperature is 6°C (44°F). Maximums can reach 22°C (72°F), and minimums can dip as low as -7°C (19°F). Be sure to pack layers to comfortably enjoy the varying temperatures during your travels.

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

The chart illustrates December temperature patterns in Ritto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ritto, December typically has an average temperature of 6°C (44°F), with highs reaching up to 22°C (72°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec394148566672808375655344
Data source: Temperature data for Ritto 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 Ritto

In Ritto in December, the precipitation amount is 63 mm (2.5 in) spread over 8 days.

December Precipitation Trends in Ritto

The chart displays monthly precipitation patterns in Ritto, 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 Ritto, December typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec52591161381441412531681362274163
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Ritto

In Ritto in December, humidity is 83%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and potentially leading to a sense of heaviness in the air.

December Average Humidity in Ritto

This chart illustrates the average monthly humidity levels in Ritto, 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 Ritto 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 Ritto

In Ritto 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 Ritto, you can check the information here.

Maximum UV Index Levels in Ritto for December

The chart shows the monthly maximum UV Index (UVI) for Ritto 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 Ritto typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110753
Data source: Ritto 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 Ritto Compares to Other Months

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

This table compares monthly weather conditions in Ritto, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)52 mm (2.0 inches)82%moderate
February Weather5°C (41°F)59 mm (2.3 inches)79%high
March Weather9°C (49°F)116 mm (4.6 inches)74%very high
April Weather14°C (57°F)138 mm (5.4 inches)76%very high
May Weather19°C (66°F)144 mm (5.7 inches)83%extreme
June Weather22°C (72°F)141 mm (5.6 inches)87%extreme
July Weather26°C (80°F)253 mm (10.0 inches)93%extreme
August Weather28°C (83°F)168 mm (6.6 inches)91%extreme
September Weather24°C (75°F)136 mm (5.4 inches)87%very high
October Weather18°C (65°F)227 mm (8.9 inches)85%high
November Weather12°C (54°F)41 mm (1.6 inches)83%moderate
December Weather6°C (44°F)63 mm (2.5 inches)83%moderate

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