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December Weather in Omamacho-omama, Japan

Last updated: August 23, 2025

In December, the average temperature in Omamacho-omama, Japan hovers around 4°C (39°F), with a recorded minimum of -7°C (20°F) and a maximum reaching 18°C (64°F). Expect about 49 mm (1.9 in) of precipitation spread across 8 days, contributing to an average humidity of 86%. Be prepared for chilly and damp conditions!

December Temperature in Omamacho-omama

In December in Omamacho-omama, the average temperature is 4°C (39°F), with maximums reaching 18°C (64°F) and minimums dropping as low as -7°C (20°F). Prepare for a mix of chilly days and mild afternoons, making it a great time for layering and exploring local attractions.

December Weather in Omamacho-omama: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Omamacho-omama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Omamacho-omama, December typically has an average temperature of 4°C (39°F), with highs reaching up to 18°C (64°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec353644526267747769594939
Data source: Temperature data for Omamacho-omama 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 Omamacho-omama

In Omamacho-omama in December, the precipitation amount is 49 mm (1.9 in) spread over 8 days.

December Precipitation Trends in Omamacho-omama

The chart displays monthly precipitation patterns in Omamacho-omama, 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 Omamacho-omama, December typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec45431151231301662621791842514349
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Omamacho-omama

In Omamacho-omama in December humidity is 86%. With an average temperature of 4°C (39°F), this humidity feels like a chilly mist enveloping you, making it essential to bundle up while exploring, as each breath comes with a damp chill that can be quite refreshing yet starkly invigorating for travelers.

December Average Humidity in Omamacho-omama

This chart illustrates the average monthly humidity levels in Omamacho-omama, 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 Omamacho-omama 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 Omamacho-omama

In Omamacho-omama 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 Omamacho-omama, you can check the information here.

Maximum UV Index Levels in Omamacho-omama for December

The chart shows the monthly maximum UV Index (UVI) for Omamacho-omama 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 Omamacho-omama typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111119753
Data source: Omamacho-omama 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 Omamacho-omama Compares to Other Months

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

This table compares monthly weather conditions in Omamacho-omama, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)45 mm (1.8 inches)88%moderate
February Weather2°C (37°F)43 mm (1.7 inches)86%moderate
March Weather7°C (44°F)115 mm (4.5 inches)81%very high
April Weather11°C (52°F)123 mm (4.9 inches)78%very high
May Weather17°C (62°F)130 mm (5.1 inches)81%very high
June Weather20°C (68°F)166 mm (6.5 inches)88%extreme
July Weather23°C (74°F)262 mm (10.3 inches)92%extreme
August Weather25°C (77°F)179 mm (7.1 inches)92%extreme
September Weather21°C (69°F)184 mm (7.2 inches)89%very high
October Weather15°C (60°F)251 mm (9.9 inches)87%high
November Weather9°C (49°F)43 mm (1.7 inches)85%moderate
December Weather4°C (39°F)49 mm (1.9 inches)86%moderate

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