January Weather in Yonezawa, Japan

Last updated: August 23, 2025

In January, the average temperature in Yonezawa, Japan hovers around -2°C (28°F). However, temperatures can dip as low as -12°C (10°F) and rise to a maximum of 6°C (44°F). Expect 169 mm (6.6 in) of precipitation spread over 21 days, contributing to an average humidity of 88%, perfect for cozy indoor activities!

January Temperature in Yonezawa

In January in Yonezawa, the average temperature is -2°C (28°F), with a maximum that can reach 6°C (44°F) and a minimum that can drop as low as -12°C (10°F). It's important to bundle up and prepare for chilly conditions if you plan to travel during this time.

January Weather in Yonezawa: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Yonezawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yonezawa, January typically has an average temperature of -2°C (28°F), with highs reaching up to 6°C (44°F) and lows dropping to around -12°C (10°F).

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

January Precipitation in Yonezawa

In Yonezawa in January, the total precipitation amount is 169 mm (6.6 in), experienced over 21 days.

January Precipitation Trends in Yonezawa

The chart displays monthly precipitation patterns in Yonezawa, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Yonezawa, January typically receives around 169 mm (6.6 inches) of precipitation spread over approximately 21 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Yonezawa

In Yonezawa in January humidity is 88%. With an average temperature of -2°C (28°F), this humidity feels like an icy cling to your skin, making every breath feel brisk and sharp, while the dampness cuts through layers of clothing, leaving travelers yearning for warmth and comfort.

January Average Humidity in Yonezawa

This chart illustrates the average monthly humidity levels in Yonezawa, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Yonezawa is approximately 88%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Yonezawa

In Yonezawa in January, 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 Yonezawa, you can check the information here.

Maximum UV Index Levels in Yonezawa for January

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

Data source: Yonezawa January 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 January Weather in Yonezawa Compares to Other Months

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

This table compares monthly weather conditions in Yonezawa, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	169 mm (6.6 inches)	88%	moderate
February Weather	-2°C (29°F)	167 mm (6.6 inches)	86%	moderate
March Weather	2°C (36°F)	153 mm (6.0 inches)	81%	very high
April Weather	8°C (46°F)	138 mm (5.4 inches)	78%	very high
May Weather	14°C (58°F)	120 mm (4.7 inches)	81%	very high
June Weather	18°C (64°F)	135 mm (5.3 inches)	88%	extreme
July Weather	22°C (72°F)	298 mm (11.7 inches)	92%	extreme
August Weather	23°C (74°F)	221 mm (8.7 inches)	92%	extreme
September Weather	19°C (66°F)	140 mm (5.5 inches)	89%	very high
October Weather	13°C (55°F)	164 mm (6.5 inches)	87%	high
November Weather	7°C (44°F)	118 mm (4.7 inches)	85%	moderate
December Weather	0°C (33°F)	203 mm (8.0 inches)	86%	moderate