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December Weather in Iwase, Japan

Last updated: August 23, 2025

The average temperature in Iwase, Japan during December is a crisp 6°C (43°F), with minimums dipping to -4°C (26°F) and maximums soaring up to 20°C (68°F). Expect about 50 mm (1.9 in) of precipitation spread over 6 days, contributing to a high average humidity of 86%. Be prepared for a refreshing but wet climate!

December Temperature in Iwase

In December in Iwase, the average temperature is 6°C (43°F). The maximum can reach 20°C (68°F), and the minimum can be as low as -4°C (26°F). Be prepared for a range of temperatures when traveling, and pack accordingly to enjoy your visit.

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

The chart illustrates December temperature patterns in Iwase, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwase, December typically has an average temperature of 6°C (43°F), with highs reaching up to 20°C (68°F) and lows dropping to around -4°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec394149576672788274645443
Data source: Temperature data for Iwase 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 Iwase

In Iwase in December, the precipitation amount is 50 mm (1.9 in) over the course of 6 days.

December Precipitation Trends in Iwase

The chart displays monthly precipitation patterns in Iwase, 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 Iwase, December typically receives around 50 mm (1.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec38371241121231322181141572256350
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Iwase

In Iwase in December humidity is 86%. With an average temperature of 6°C (43°F), this humidity feels like a chilling blanket enveloping you, making outdoor exploration feel damp and uncomfortable.

December Average Humidity in Iwase

This chart illustrates the average monthly humidity levels in Iwase, 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 Iwase is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%79%81%88%92%92%89%87%85%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Iwase

In Iwase in December, 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 Iwase, you can check the information here.

Maximum UV Index Levels in Iwase for December

The chart shows the monthly maximum UV Index (UVI) for Iwase 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 Iwase typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101011109653
Data source: Iwase 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 Iwase Compares to Other Months

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

This table compares monthly weather conditions in Iwase, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)38 mm (1.5 inches)88%moderate
February Weather5°C (42°F)37 mm (1.5 inches)86%moderate
March Weather9°C (49°F)124 mm (4.9 inches)81%high
April Weather14°C (57°F)112 mm (4.4 inches)78%very high
May Weather19°C (67°F)123 mm (4.8 inches)81%very high
June Weather22°C (72°F)132 mm (5.2 inches)88%very high
July Weather26°C (79°F)218 mm (8.6 inches)92%extreme
August Weather28°C (82°F)114 mm (4.5 inches)92%very high
September Weather23°C (74°F)157 mm (6.2 inches)89%very high
October Weather18°C (64°F)225 mm (8.8 inches)87%high
November Weather12°C (54°F)63 mm (2.5 inches)85%moderate
December Weather6°C (43°F)50 mm (1.9 inches)86%moderate

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