January Weather in Hiroo, Japan

Last updated: August 23, 2025

In January, the average temperature in Hiroo, Japan hovers around -5°C (24°F), with minimums plummeting to -17°C (2°F) and maximal highs reaching 6°C (44°F). Expect around 61 mm (2.4 in) of precipitation spread over 8 days, coupled with a high average humidity of 84%. Prepare for a chilly and damp atmosphere!

January Temperature in Hiroo

In January in Hiroo, the average temperature is -5°C (24°F), with maximums reaching 6°C (44°F) and minimums dropping to as low as -17°C (2°F). This chilly weather makes it essential for travelers to pack warm clothing and be prepared for cold conditions.

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

The chart illustrates January temperature patterns in Hiroo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hiroo, January typically has an average temperature of -5°C (24°F), with highs reaching up to 6°C (44°F) and lows dropping to around -17°C (2°F).

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

January Precipitation in Hiroo

In Hiroo in January, the precipitation amount is 61 mm (2.4 in) distributed over 8 days.

January Precipitation Trends in Hiroo

The chart displays monthly precipitation patterns in Hiroo, 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 Hiroo, January typically receives around 61 mm (2.4 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 Hiroo

In Hiroo in January, humidity is 84%. With an average temperature of -5°C (24°F), this humidity feels like an icy blanket wrapped around you, making the air feel even colder and more biting, which can be quite uncomfortable for traveling.

January Average Humidity in Hiroo

This chart illustrates the average monthly humidity levels in Hiroo, 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 Hiroo is approximately 84%, 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 Hiroo

In Hiroo in January, 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 Hiroo, you can visit Hourly UV Index in Hiroo.

Maximum UV Index Levels in Hiroo for January

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

Data source: Hiroo 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 Hiroo Compares to Other Months

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

This table compares monthly weather conditions in Hiroo, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	61 mm (2.4 inches)	84%	low
February Weather	-4°C (25°F)	65 mm (2.6 inches)	83%	moderate
March Weather	1°C (34°F)	115 mm (4.5 inches)	83%	high
April Weather	5°C (42°F)	97 mm (3.8 inches)	83%	very high
May Weather	11°C (52°F)	95 mm (3.7 inches)	86%	very high
June Weather	14°C (58°F)	105 mm (4.1 inches)	88%	very high
July Weather	18°C (65°F)	106 mm (4.2 inches)	93%	very high
August Weather	19°C (67°F)	175 mm (6.9 inches)	96%	very high
September Weather	17°C (63°F)	140 mm (5.5 inches)	89%	very high
October Weather	12°C (54°F)	201 mm (7.9 inches)	83%	high
November Weather	6°C (43°F)	90 mm (3.6 inches)	80%	moderate
December Weather	-1°C (30°F)	66 mm (2.6 inches)	79%	low