Ome Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Ome, Tokyo Prefecture, Japan. This average is based on long-term data collected between 1990 and 2020. Let's explore the details to provide you with a complete overview.

Ome experiences significant rain/snowfall throughout the year, averaging 1988 mm (78 in) of precipitation annually. However, this abundant rainfall is not evenly distributed, with a distinct rainy season during certain months. You can clearly see this in our monthly precipitation graphs below.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

The climate in Ome shows significant variation throughout the year. Expect 264 mm (10 in) of precipitation during the wettest month September, distributed over 19 rainy days.

In contrast, December offers drier and sunnier days, with around 68 mm (2.7 in) of rainfall over 7 rainy days.

September, the wettest month, has a maximum daytime temperature of 26°C (79°F). The city receives 137 hours of sunshine in this period. During the driest month December you can expect a temperature of 11°C (52°F). For more detailed insights into the city's temperatures, visit our Ome Temperature page.

Ome's average annual precipitation is 1988 mm (78 in). Let's compare this to some popular worldwide tourist destinations:

Chicago, USA, sees an annual precipitation of 1062 mm (42 in), with rain and snow contributing to its humid climate.

In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.

Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.

Mumbai, India, experiences a tropical monsoon climate with 1860 mm (73 in) of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.

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.

Climate change is affecting precipitation patterns worldwide, including Ome:

• Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
• Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.

• "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
• The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
• The greatest snowfall recorded was on Mt. Rainier, Washington State, USA, over 31.5 meters (103 feet) fell during the winter of 1972.

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