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December Weather in Oga, Japan

Last updated: August 23, 2025

In Oga, Japan, the average temperature in December hovers around 6°C (42°F), making it a cool time of year. Temperatures can dip as low as -3°C (27°F) and occasionally reach a maximum of 17°C (62°F). Expect a precipitation level of 256 mm (10.1 in) spread over 28 days, resulting in a rather damp atmosphere with an average humidity of 78%.

December Temperature in Oga

In December in Oga, the average temperature is 6°C (42°F), with maximums reaching 17°C (62°F) and minimums dropping as low as -3°C (27°F). It's advisable to pack layers to stay comfortable during your travels.

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

The chart illustrates December temperature patterns in Oga, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oga, December typically has an average temperature of 6°C (42°F), with highs reaching up to 17°C (62°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec373743495865747772635342
Data source: Temperature data for Oga 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 Oga

In Oga in December, the precipitation amount is 256 mm (10.1 in) over a span of 28 days.

December Precipitation Trends in Oga

The chart displays monthly precipitation patterns in Oga, 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 Oga, December typically receives around 256 mm (10.1 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec148159116129133146161199165218194257
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Oga

In Oga in December humidity is 78%. With an average temperature of 6°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities a bit uncomfortable and requiring careful planning to stay warm and dry while exploring.

December Average Humidity in Oga

This chart illustrates the average monthly humidity levels in Oga, 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 Oga is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%76%78%86%90%93%92%84%80%76%78%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Oga

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

Maximum UV Index Levels in Oga for December

The chart shows the monthly maximum UV Index (UVI) for Oga 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 Oga typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec336891010119642
Data source: Oga 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 Oga Compares to Other Months

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

This table compares monthly weather conditions in Oga, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)148 mm (5.8 inches)79%moderate
February Weather3°C (37°F)159 mm (6.3 inches)78%moderate
March Weather6°C (43°F)116 mm (4.6 inches)76%high
April Weather9°C (49°F)129 mm (5.1 inches)78%very high
May Weather14°C (58°F)133 mm (5.2 inches)86%very high
June Weather18°C (65°F)146 mm (5.8 inches)90%very high
July Weather23°C (74°F)160 mm (6.3 inches)93%very high
August Weather25°C (78°F)199 mm (7.8 inches)92%extreme
September Weather22°C (72°F)165 mm (6.5 inches)84%very high
October Weather17°C (63°F)218 mm (8.6 inches)80%high
November Weather11°C (53°F)194 mm (7.6 inches)76%moderate
December Weather6°C (42°F)256 mm (10.1 inches)78%low

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