December Weather in Arai, Japan

Last updated: August 23, 2025

In December, the average temperature in Arai, Japan hovers around 2°C (37°F). During this month, temperatures can dip to a chilly -10°C (14°F), while reaching a pleasant high of 19°C (67°F). Expect 247 mm (9.7 in) of precipitation over approximately 23 days, contributing to an average humidity of 86%.

December Temperature in Arai

In December in Arai, the average temperature is 2°C (37°F). The maximum can reach up to 19°C (67°F) and the minimum can drop as low as -10°C (14°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for their visit.

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

The chart illustrates December temperature patterns in Arai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arai, December typically has an average temperature of 2°C (37°F), with highs reaching up to 19°C (67°F) and lows dropping to around -10°C (14°F).

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

December Precipitation in Arai

In Arai in December, the precipitation amount is 247 mm (9.7 in) recorded over a span of 23 days.

December Precipitation Trends in Arai

The chart displays monthly precipitation patterns in Arai, 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 Arai, December typically receives around 247 mm (9.7 inches) of precipitation spread over approximately 23 days.

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

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Millimeters (mm) Inches (in)

December Humidity in Arai

In Arai in December, humidity is 86%. With an average temperature of 2°C (37°F), this humidity feels like a chilly dampness that clings to your clothes and makes outdoor activities quite uncomfortable for traveling.

December Average Humidity in Arai

This chart illustrates the average monthly humidity levels in Arai, 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 Arai is approximately 86%, 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 Arai

In Arai 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 Arai, you can check the information here.

Maximum UV Index Levels in Arai for December

The chart shows the monthly maximum UV Index (UVI) for Arai 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 Arai typically reaches 3, which falls under the moderate exposure category.

Data source: Arai 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 Arai Compares to Other Months

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

This table compares monthly weather conditions in Arai, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	227 mm (8.9 inches)	88%	moderate
February Weather	0°C (33°F)	188 mm (7.4 inches)	86%	moderate
March Weather	4°C (40°F)	149 mm (5.8 inches)	81%	very high
April Weather	9°C (49°F)	146 mm (5.8 inches)	78%	very high
May Weather	16°C (60°F)	152 mm (6.0 inches)	81%	very high
June Weather	19°C (66°F)	173 mm (6.8 inches)	88%	extreme
July Weather	23°C (75°F)	353 mm (13.9 inches)	92%	extreme
August Weather	25°C (77°F)	210 mm (8.3 inches)	92%	extreme
September Weather	20°C (69°F)	207 mm (8.2 inches)	89%	very high
October Weather	15°C (59°F)	235 mm (9.3 inches)	87%	high
November Weather	8°C (48°F)	144 mm (5.7 inches)	85%	moderate
December Weather	2°C (37°F)	247 mm (9.7 inches)	86%	moderate