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December Weather in Tomamae, Japan

Last updated: August 23, 2025

In Tomamae, Japan, the average temperature in December hovers around -1°C (30°F). Expect chilly conditions, with minimums dropping to -14°C (8°F) and maximums reaching up to 12°C (53°F). This month also brings about 124 mm (4.9 in) of precipitation, spread across 27 days. The air is notably humid, with an average humidity level of 83%.

December Temperature in Tomamae

In December in Tomamae, the average temperature is -1°C (30°F), with maximums reaching 12°C (53°F) and minimums plummeting to as low as -14°C (8°F). Travelers should prepare for a chilly atmosphere and pack accordingly to fully enjoy their visit.

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

The chart illustrates December temperature patterns in Tomamae, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tomamae, December typically has an average temperature of -1°C (30°F), with highs reaching up to 12°C (53°F) and lows dropping to around -14°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec242534435259697064544230
Data source: Temperature data for Tomamae 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 Tomamae

In Tomamae in December, the total precipitation amount is 124 mm (4.9 in) spread over 27 days.

December Precipitation Trends in Tomamae

The chart displays monthly precipitation patterns in Tomamae, 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 Tomamae, December typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec6780786579879615884150154124
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Tomamae

In Tomamae in December humidity is 83%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities uncomfortable and encouraging travelers to seek shelter indoors.

December Average Humidity in Tomamae

This chart illustrates the average monthly humidity levels in Tomamae, 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 Tomamae is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%84%83%84%88%88%93%94%86%79%77%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Tomamae

In Tomamae in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Tomamae, you can visit Hourly UV Index in Tomamae.

Maximum UV Index Levels in Tomamae for December

The chart shows the monthly maximum UV Index (UVI) for Tomamae 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 Tomamae typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789997532
Data source: Tomamae 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 Tomamae Compares to Other Months

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

This table compares monthly weather conditions in Tomamae, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)67 mm (2.6 inches)87%low
February Weather-4°C (25°F)80 mm (3.1 inches)84%moderate
March Weather1°C (34°F)78 mm (3.1 inches)83%moderate
April Weather6°C (43°F)65 mm (2.6 inches)84%high
May Weather11°C (52°F)79 mm (3.1 inches)88%very high
June Weather15°C (59°F)87 mm (3.4 inches)88%very high
July Weather21°C (69°F)96 mm (3.8 inches)93%very high
August Weather21°C (70°F)158 mm (6.2 inches)94%very high
September Weather18°C (65°F)84 mm (3.3 inches)86%high
October Weather12°C (54°F)150 mm (5.9 inches)79%moderate
November Weather6°C (42°F)154 mm (6.1 inches)77%moderate
December Weather-1°C (30°F)124 mm (4.9 inches)83%low

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