January Weather in Ritto, Japan

Last updated: August 23, 2025

In January, the average temperature in Ritto, Japan hovers around 4°C (39°F), with extremes ranging from a chilly -7°C (20°F) to a mild 15°C (60°F). Expect about 52 mm (2.0 in) of precipitation spread over 8 days, creating a damp environment with an average humidity of 82%. Stay prepared for a mix of cold and moisture!

January Temperature in Ritto

In January in Ritto, the average temperature is 4°C (39°F). The maximum can reach 15°C (60°F), while the minimum can dip as low as -7°C (20°F). Be prepared for a range of temperatures and pack accordingly for your travels.

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

The chart illustrates January temperature patterns in Ritto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ritto, January typically has an average temperature of 4°C (39°F), with highs reaching up to 15°C (60°F) and lows dropping to around -7°C (20°F).

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

January Precipitation in Ritto

In Ritto in January, the total precipitation amount is 52 mm (2.0 in) recorded over a span of 8 days.

January Precipitation Trends in Ritto

The chart displays monthly precipitation patterns in Ritto, 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 Ritto, January typically receives around 52 mm (2.0 inches) of precipitation spread over approximately 8 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 Ritto

In Ritto in January, humidity is 82%. With an average temperature of 4°C (39°F), this humidity feels like a chill that seeps into your bones, making it uncomfortable for traveling as you find yourself bundled up, yet still damp and cold.

January Average Humidity in Ritto

This chart illustrates the average monthly humidity levels in Ritto, 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 Ritto is approximately 82%, 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 Ritto

In Ritto in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Ritto for better planning.

Maximum UV Index Levels in Ritto for January

The chart shows the monthly maximum UV Index (UVI) for Ritto 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 Ritto typically reaches 4, which falls under the moderate exposure category.

Data source: Ritto 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 Ritto Compares to Other Months

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

This table compares monthly weather conditions in Ritto, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	52 mm (2.0 inches)	82%	moderate
February Weather	5°C (41°F)	59 mm (2.3 inches)	79%	high
March Weather	9°C (49°F)	116 mm (4.6 inches)	74%	very high
April Weather	14°C (57°F)	138 mm (5.4 inches)	76%	very high
May Weather	19°C (66°F)	144 mm (5.7 inches)	83%	extreme
June Weather	22°C (72°F)	141 mm (5.6 inches)	87%	extreme
July Weather	26°C (80°F)	253 mm (10.0 inches)	93%	extreme
August Weather	28°C (83°F)	168 mm (6.6 inches)	91%	extreme
September Weather	24°C (75°F)	136 mm (5.4 inches)	87%	very high
October Weather	18°C (65°F)	227 mm (8.9 inches)	85%	high
November Weather	12°C (54°F)	41 mm (1.6 inches)	83%	moderate
December Weather	6°C (44°F)	63 mm (2.5 inches)	83%	moderate