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December Weather in Iijima, Japan

Last updated: August 23, 2025

In December, the average temperature in Iijima, Japan hovers around 1°C (34°F). Temperatures can dip as low as -10°C (15°F), while the mercury can rise to a pleasant 16°C (61°F). Expect 77 mm (3.0 in) of precipitation over 10 days, contributing to an average humidity level of 78%. Prepare for a mix of chilly and damp conditions!

December Temperature in Iijima

In December in Iijima, the average temperature is 1°C (34°F). The maximum can reach 16°C (61°F), while the minimum can drop to as low as -10°C (15°F). Be sure to pack warm clothing and be prepared for chilly weather if you plan to visit during this time.

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

The chart illustrates December temperature patterns in Iijima, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iijima, December typically has an average temperature of 1°C (34°F), with highs reaching up to 16°C (61°F) and lows dropping to around -10°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec293040485864717366564434
Data source: Temperature data for Iijima 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 Iijima

In Iijima in December, the total precipitation amount is 77 mm (3.0 in) spread over a duration of 10 days.

December Precipitation Trends in Iijima

The chart displays monthly precipitation patterns in Iijima, 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 Iijima, December typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec71821461481611513151511672476577
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Iijima

In Iijima in December, humidity is 78%. With an average temperature of 1°C (34°F), this humidity feels like an extra layer of chill in the air, making travel uncomfortable and damp, often leading to a persistent sense of cold that can seep into your bones, leaving you wishing for a warm shelter.

December Average Humidity in Iijima

This chart illustrates the average monthly humidity levels in Iijima, 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 Iijima is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%74%70%74%82%88%93%90%86%83%80%78%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Iijima

In Iijima in December, 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 Iijima for better planning.

Maximum UV Index Levels in Iijima for December

The chart shows the monthly maximum UV Index (UVI) for Iijima 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 Iijima typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101111121210764
Data source: Iijima 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 Iijima Compares to Other Months

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

This table compares monthly weather conditions in Iijima, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)71 mm (2.8 inches)76%moderate
February Weather-1°C (31°F)82 mm (3.2 inches)74%high
March Weather4°C (40°F)146 mm (5.7 inches)70%very high
April Weather9°C (48°F)148 mm (5.8 inches)74%very high
May Weather14°C (58°F)161 mm (6.3 inches)81%extreme
June Weather18°C (64°F)151 mm (5.9 inches)88%extreme
July Weather22°C (71°F)315 mm (12.4 inches)93%extreme
August Weather23°C (74°F)150 mm (5.9 inches)90%extreme
September Weather19°C (66°F)166 mm (6.6 inches)86%very high
October Weather13°C (56°F)247 mm (9.7 inches)83%high
November Weather7°C (45°F)65 mm (2.6 inches)80%high
December Weather1°C (34°F)77 mm (3.0 inches)78%moderate

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