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December Weather in Nantan, Japan

Last updated: August 23, 2025

In Nantan, Japan, the average temperature in December hovers around 6°C (43°F). While you might experience chilly lows of -7°C (19°F), the occasional warm day can reach up to 21°C (70°F). Expect 64 mm (2.5 in) of precipitation spread across 7 days, with an average humidity level of a brisk 83%. Prepare accordingly for a mix of cool and damp weather!

December Temperature in Nantan

In December in Nantan, the average temperature is 6°C (43°F). Maximum temperatures can reach 21°C (70°F), while minimums can drop as low as -7°C (19°F). It's advisable to pack layers to stay comfortable during your travels.

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

The chart illustrates December temperature patterns in Nantan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nantan, December typically has an average temperature of 6°C (43°F), with highs reaching up to 21°C (70°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec394048566571798274645343
Data source: Temperature data for Nantan 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 Nantan

In Nantan in December, the precipitation amount is 64 mm (2.5 in) accumulated over a period of 7 days.

December Precipitation Trends in Nantan

The chart displays monthly precipitation patterns in Nantan, 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 Nantan, December typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec52621201551521583412391932434764
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Nantan

In Nantan in December, humidity is 83%. With an average temperature of 6°C (43°F), this humidity feels like a brisk chill that can make you feel colder than the actual temperature, often leading to a damp and uncomfortable experience for traveling.

December Average Humidity in Nantan

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

In Nantan 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 Nantan, you can check the information here.

Maximum UV Index Levels in Nantan for December

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

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

This table compares monthly weather conditions in Nantan, 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 (2.1 inches)82%moderate
February Weather4°C (40°F)62 mm (2.4 inches)79%high
March Weather9°C (48°F)120 mm (4.7 inches)74%very high
April Weather13°C (56°F)155 mm (6.1 inches)76%very high
May Weather18°C (65°F)151 mm (6.0 inches)83%extreme
June Weather22°C (71°F)158 mm (6.2 inches)87%extreme
July Weather26°C (79°F)341 mm (13.4 inches)93%extreme
August Weather28°C (82°F)238 mm (9.4 inches)91%extreme
September Weather23°C (74°F)193 mm (7.6 inches)87%very high
October Weather18°C (64°F)243 mm (9.6 inches)85%high
November Weather12°C (53°F)46 mm (1.8 inches)83%moderate
December Weather6°C (43°F)64 mm (2.5 inches)83%moderate

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