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December Weather in Niimi, Japan

Last updated: August 23, 2025

In December, the average temperature in Niimi, Japan hovers around 4°C (40°F). The weather can vary significantly, with minimums dipping to -3°C (27°F) and maximums reaching up to 18°C (65°F). Expect about 62 mm (2.4 in) of precipitation spread across 11 days, contributing to an average humidity of 82%.

December Temperature in Niimi

In December in Niimi, the average temperature is 4°C (40°F), with maximums reaching up to 18°C (65°F) and minimums dropping as low as -3°C (27°F). Travelers should be prepared for a wide range of temperatures, so layering clothing is advisable for comfort throughout the day.

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

The chart illustrates December temperature patterns in Niimi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Niimi, December typically has an average temperature of 4°C (40°F), with highs reaching up to 18°C (65°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec363846546369767971615040
Data source: Temperature data for Niimi 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 Niimi

In Niimi in December, the precipitation amount is 62 mm (2.4 in) spread over 11 days.

December Precipitation Trends in Niimi

The chart displays monthly precipitation patterns in Niimi, 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 Niimi, December typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec52591161271151863562422291813862
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Niimi

In Niimi in December, humidity is 82%. With an average temperature of 4°C (40°F), this humidity feels like a chilly dampness that lingers in the air, making travel slightly uncomfortable as the cold penetrates through layers of clothing, often leaving you feeling chilled and clammy.

December Average Humidity in Niimi

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

In Niimi 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 Niimi, you can check the information here.

Maximum UV Index Levels in Niimi for December

The chart shows the monthly maximum UV Index (UVI) for Niimi 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 Niimi typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121210753
Data source: Niimi 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 Niimi Compares to Other Months

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

This table compares monthly weather conditions in Niimi, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)52 mm (2.1 inches)82%moderate
February Weather3°C (38°F)59 mm (2.3 inches)79%high
March Weather8°C (46°F)116 mm (4.5 inches)73%very high
April Weather12°C (54°F)127 mm (5.0 inches)74%very high
May Weather17°C (63°F)115 mm (4.5 inches)84%extreme
June Weather21°C (69°F)186 mm (7.3 inches)86%extreme
July Weather25°C (77°F)356 mm (14.0 inches)92%extreme
August Weather26°C (79°F)242 mm (9.5 inches)92%extreme
September Weather22°C (71°F)229 mm (9.0 inches)87%very high
October Weather16°C (61°F)181 mm (7.1 inches)85%high
November Weather10°C (50°F)37 mm (1.5 inches)84%moderate
December Weather4°C (40°F)62 mm (2.4 inches)82%moderate

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