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December Weather in Unnan, Japan

Last updated: August 23, 2025

In December, the average temperature in Unnan, Japan hovers around 6°C (43°F), with a minimum of -3°C (27°F) and a maximum of 21°C (69°F). Expect 121 mm (4.8 in) of precipitation spread over about 17 days, contributing to a high average humidity of 82%. Be prepared for varied weather conditions!

December Temperature in Unnan

In December in Unnan, the average temperature is 6°C (43°F). Maximums can reach 21°C (69°F) and minimums can be as low as -3°C (27°F). Be prepared for a wide range of weather conditions if you're planning to visit during this time.

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

The chart illustrates December temperature patterns in Unnan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Unnan, December typically has an average temperature of 6°C (43°F), with highs reaching up to 21°C (69°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec383947556470788172625242
Data source: Temperature data for Unnan 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 Unnan

In Unnan in December, the total precipitation amount is 121 mm (4.8 in) recorded over the course of 17 days.

December Precipitation Trends in Unnan

The chart displays monthly precipitation patterns in Unnan, 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 Unnan, December typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec9610213812510219730126323817258121
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Unnan

In Unnan in December, humidity is 82%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration feel less invigorating and more uncomfortable, as the heavy air can leave you feeling sluggish and fatigued during your travels.

December Average Humidity in Unnan

This chart illustrates the average monthly humidity levels in Unnan, 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 Unnan is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%73%74%84%86%92%92%87%85%84%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Unnan

In Unnan 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 Unnan, you can check the information here.

Maximum UV Index Levels in Unnan for December

The chart shows the monthly maximum UV Index (UVI) for Unnan 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 Unnan typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec458111111121210753
Data source: Unnan 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 Unnan Compares to Other Months

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

This table compares monthly weather conditions in Unnan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)96 mm (3.8 inches)82%moderate
February Weather4°C (40°F)102 mm (4.0 inches)79%moderate
March Weather8°C (47°F)138 mm (5.4 inches)73%very high
April Weather13°C (55°F)125 mm (4.9 inches)74%extreme
May Weather18°C (65°F)102 mm (4.0 inches)84%extreme
June Weather21°C (70°F)197 mm (7.7 inches)86%extreme
July Weather25°C (78°F)301 mm (11.9 inches)92%extreme
August Weather27°C (81°F)263 mm (10.4 inches)92%extreme
September Weather22°C (72°F)238 mm (9.4 inches)87%very high
October Weather17°C (62°F)172 mm (6.8 inches)85%high
November Weather11°C (52°F)58 mm (2.3 inches)84%moderate
December Weather6°C (43°F)121 mm (4.8 inches)82%moderate

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