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December Weather in Oma, Japan

Last updated: August 23, 2025

In December, the average temperature in Oma, Japan hovers around 3°C (38°F). Expect a range of temperatures, with a minimum dropping to -4°C (25°F) and a maximum reaching 15°C (59°F). Prepare for a wet month as precipitation averages 167 mm (6.6 in) over 27 days, and the air remains quite damp with an average humidity of 77%.

December Temperature in Oma

In December in Oma, the average temperature is 3°C (38°F). Maximums can reach 15°C (59°F), while minimums can be as low as -4°C (25°F). Be prepared for a mix of cool and chilly weather, making it essential to pack layers for your trip.

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

The chart illustrates December temperature patterns in Oma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oma, December typically has an average temperature of 3°C (38°F), with highs reaching up to 15°C (59°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec343340455258667169604938
Data source: Temperature data for Oma 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 Oma

In Oma, in December, the precipitation amount is 167 mm (6.6 in) over the course of 27 days.

December Precipitation Trends in Oma

The chart displays monthly precipitation patterns in Oma, 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 Oma, December typically receives around 167 mm (6.6 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec117115949795107100171116159133167
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Oma

In Oma in December humidity is 77%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill enveloping you, making any outdoor adventure feel more intense as you navigate the biting cold mixed with the heavy air.

December Average Humidity in Oma

This chart illustrates the average monthly humidity levels in Oma, 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 Oma is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%77%78%86%91%95%97%89%82%78%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Oma

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

Maximum UV Index Levels in Oma for December

The chart shows the monthly maximum UV Index (UVI) for Oma 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 Oma typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235891010118632
Data source: Oma 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 Oma Compares to Other Months

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

This table compares monthly weather conditions in Oma, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)117 mm (4.6 inches)79%low
February Weather1°C (34°F)115 mm (4.5 inches)78%moderate
March Weather4°C (40°F)94 mm (3.7 inches)77%moderate
April Weather7°C (46°F)97 mm (3.8 inches)78%very high
May Weather11°C (52°F)95 mm (3.8 inches)86%very high
June Weather14°C (58°F)107 mm (4.2 inches)91%very high
July Weather19°C (66°F)100 mm (3.9 inches)95%very high
August Weather21°C (71°F)171 mm (6.7 inches)97%extreme
September Weather20°C (69°F)116 mm (4.6 inches)89%very high
October Weather16°C (61°F)159 mm (6.3 inches)81%high
November Weather9°C (49°F)133 mm (5.2 inches)78%moderate
December Weather3°C (38°F)167 mm (6.6 inches)77%low

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