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December Weather in Hiroo, Japan

Last updated: August 23, 2025

In December, the average temperature in Hiroo, Japan hovers around -1°C (30°F). Expect chilly conditions, with minimum temperatures reaching as low as -11°C (12°F) and a maximum of 13°C (56°F). The month brings 66 mm (2.6 in) of precipitation over 9 days, contributing to an overall average humidity of 79%. Dress warmly and be prepared for damp days!

December Temperature in Hiroo

In December in Hiroo, the average temperature is -1°C (30°F), with a maximum reaching 13°C (56°F) and a minimum dropping as low as -11°C (12°F). Travelers should prepare for chilly weather and bring warm clothing to comfortably enjoy the sights and activities the destination has to offer.

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

The chart illustrates December 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, December typically has an average temperature of -1°C (30°F), with highs reaching up to 13°C (56°F) and lows dropping to around -11°C (12°F).
JanFebMarAprMayJunJulAugSepOctNovDec242433425257656763534330
Data source: Temperature data for Hiroo generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Hiroo

In Hiroo in December, the precipitation amount is 66 mm (2.6 in) over the course of 9 days.

December Precipitation Trends in Hiroo

The chart displays monthly precipitation patterns in Hiroo, 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 Hiroo, December typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec616511597951051061751402019066
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hiroo

In Hiroo in December, humidity is 79%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill in the air, making outdoor activities uncomfortable and requiring extra layers to stay warm while exploring.

December Average Humidity in Hiroo

This chart illustrates the average monthly humidity levels in Hiroo, 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 Hiroo is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%83%86%88%93%96%89%83%80%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hiroo

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

Maximum UV Index Levels in Hiroo for December

The chart shows the monthly maximum UV Index (UVI) for Hiroo 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 Hiroo typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec236891010108632
Data source: Hiroo 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 Hiroo Compares to Other Months

Weather in Hiroo varies notably across the year, with each month offering distinct climate conditions. This page compares December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
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 Weather1°C (34°F)115 mm (4.5 inches)83%high
April Weather5°C (42°F)97 mm (3.8 inches)83%very high
May Weather11°C (52°F)95 mm (3.7 inches)86%very high
June Weather14°C (58°F)105 mm (4.1 inches)88%very high
July Weather18°C (65°F)106 mm (4.2 inches)93%very high
August Weather19°C (67°F)175 mm (6.9 inches)96%very high
September Weather17°C (63°F)140 mm (5.5 inches)89%very high
October Weather12°C (54°F)201 mm (7.9 inches)83%high
November Weather6°C (43°F)90 mm (3.6 inches)80%moderate
December Weather-1°C (30°F)66 mm (2.6 inches)79%low

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