December Weather in Tomakomai, Japan

Last updated: August 23, 2025

In December, the average temperature in Tomakomai, Japan hovers around -1°C (30°F). Be prepared for chilly conditions, as temperatures can drop as low as -10°C (13°F), while peaking at a milder 12°C (55°F). Expect about 62 mm (2.4 in) of precipitation spread over 11 days, contributing to an average humidity of 80%. Stay warm and ready for wet weather!

December Temperature in Tomakomai

In December in Tomakomai, the average temperature is -1°C (30°F). The maximum can reach 12°C (55°F) and the minimum can be as low as -10°C (13°F). Be sure to pack warm clothing if you plan to visit during this time.

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

The chart illustrates December temperature patterns in Tomakomai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tomakomai, December typically has an average temperature of -1°C (30°F), with highs reaching up to 12°C (55°F) and lows dropping to around -10°C (13°F).

Data source: Temperature data for Tomakomai generated using information from the Copernicus Climate Change Service.

December Precipitation in Tomakomai

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

December Precipitation Trends in Tomakomai

The chart displays monthly precipitation patterns in Tomakomai, 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 Tomakomai, December typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Tomakomai

In Tomakomai in December, humidity is 80%. With an average temperature of -1°C (30°F), this humidity feels like an uncomfortable chill that seeps into your bones, making outdoor activities less enjoyable and travel quite challenging.

December Average Humidity in Tomakomai

This chart illustrates the average monthly humidity levels in Tomakomai, 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 Tomakomai is approximately 80%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Tomakomai

In Tomakomai 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 Tomakomai, you can visit Hourly UV Index in Tomakomai.

Maximum UV Index Levels in Tomakomai for December

The chart shows the monthly maximum UV Index (UVI) for Tomakomai 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 Tomakomai typically reaches 2, which falls under the low exposure category.

Data source: Tomakomai 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 Tomakomai Compares to Other Months

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

This table compares monthly weather conditions in Tomakomai, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	49 mm (1.9 inches)	84%	low
February Weather	-4°C (26°F)	53 mm (2.1 inches)	83%	moderate
March Weather	1°C (34°F)	89 mm (3.5 inches)	81%	moderate
April Weather	5°C (42°F)	93 mm (3.7 inches)	81%	high
May Weather	11°C (51°F)	90 mm (3.6 inches)	86%	very high
June Weather	14°C (58°F)	128 mm (5.1 inches)	87%	very high
July Weather	19°C (66°F)	121 mm (4.7 inches)	93%	very high
August Weather	20°C (69°F)	206 mm (8.1 inches)	95%	very high
September Weather	18°C (64°F)	145 mm (5.7 inches)	88%	very high
October Weather	12°C (54°F)	143 mm (5.6 inches)	83%	moderate
November Weather	6°C (42°F)	102 mm (4.0 inches)	79%	moderate
December Weather	-1°C (30°F)	62 mm (2.4 inches)	80%	low