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December Weather in Tonami, Japan

Last updated: August 23, 2025

In December, the average temperature in Tonami, Japan hovers around a chilly 3°C (37°F). Expect the mercury to dip to a minimum of -10°C (13°F) and occasionally rise to a pleasant 19°C (67°F). With 250 mm (9.8 in) of precipitation spread over 23 days, don’t forget your umbrella! The air is quite moist, with an average humidity of 79%, making it a uniquely refreshing experience.

December Temperature in Tonami

In December in Tonami, the average temperature is 3°C (37°F), with maximum temperatures reaching up to 19°C (67°F) and minimums dropping as low as -10°C (13°F). It's advisable to pack warm clothing and layers for your trip, as the weather can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Tonami, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tonami, December typically has an average temperature of 3°C (37°F), with highs reaching up to 19°C (67°F) and lows dropping to around -10°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec313341506167757869584737
Data source: Temperature data for Tonami 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 Tonami

In Tonami in December, the total precipitation amount is 250 mm (9.8 in), distributed over 23 days of the month.

December Precipitation Trends in Tonami

The chart displays monthly precipitation patterns in Tonami, 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 Tonami, December typically receives around 250 mm (9.8 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec205193209214170248424321285261162250
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Tonami

In Tonami in December, humidity is 79%. With an average temperature of 3°C (37°F), this humidity feels like a chilly blanket that clings to your skin, making travel uncomfortable and damp as the cold penetrates your layers.

December Average Humidity in Tonami

This chart illustrates the average monthly humidity levels in Tonami, 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 Tonami is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%76%77%85%89%93%92%84%81%77%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Tonami

In Tonami 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 Tonami, you can check the information here.

Maximum UV Index Levels in Tonami for December

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

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

This table compares monthly weather conditions in Tonami, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)204 mm (8.1 inches)80%moderate
February Weather0°C (33°F)193 mm (7.6 inches)78%high
March Weather5°C (41°F)209 mm (8.2 inches)76%very high
April Weather10°C (51°F)214 mm (8.4 inches)77%very high
May Weather16°C (62°F)170 mm (6.7 inches)85%extreme
June Weather20°C (67°F)248 mm (9.8 inches)89%extreme
July Weather24°C (76°F)424 mm (16.7 inches)93%extreme
August Weather25°C (78°F)321 mm (12.6 inches)92%extreme
September Weather21°C (70°F)285 mm (11.2 inches)84%very high
October Weather15°C (59°F)261 mm (10.3 inches)81%high
November Weather8°C (47°F)162 mm (6.4 inches)77%moderate
December Weather3°C (37°F)250 mm (9.8 inches)79%moderate

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