Oshima Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows both the average monthly rainfall and the number of rainy days in Oshima, Tokyo Prefecture, Japan. These averages rely on historical data collected over 30 years, from 1990 to 2020. Let's now guide you through the details for a complete overview.

Oshima has a notably wet climate with abundant precipitation, recording 2191 mm of rainfall per year.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm)

The climate in Oshima shows significant variation throughout the year. Expect 276 mm of precipitation during the wettest month June, distributed over 20 rainy days.

In contrast, December offers drier and sunnier days, with around 107 mm of rainfall over 12 rainy days.

June, the wettest month, has a maximum daytime temperature of 23°C. During the driest month December you can expect a temperature of 15°C. For more detailed insights into the city’s temperatures, visit our Oshima Temperature page.

Annual Precipitation in Japan

The map below shows the annual precipitation across Japan. You can also select the different months in case you are interested in a specific month.

Amsterdam Precipitation Compared World Wide

Oshima’s average annual precipitation is 2191 mm. Let’s compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 644 mm, evenly distributed across the year with no extreme wet or dry seasons.

Beijing, China, receives 560 mm of annual precipitation, concentrated in the summer months.

In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.

Ho Chi Minh City, Vietnam, receives 1955 mm of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

How is Precipitation Measured?

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Interesting weather facts

• Mawsynram in India is noted as being the wettest place on earth, with over 11 meters of rain falling every year.
• In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm per year, with some years recording virtually no rainfall.
• Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.

For more detailed information about Oshima’s weather, including sunshine hours, humidity levels, and temperature data, visit our Oshima Climate page.