Omachi Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Omachi, Nagano Prefecture, Japan. Long-term data from 1990 to 2020 was used to calculate these averages. Now, let's explore all the details to give you a full picture.

Omachi is known for its substantial rain/snowfall, with annual precipitation reaching 2875 mm (113 in).

Monthly Precipitation Levels

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

The climate in Omachi shows significant variation throughout the year. Expect 400 mm (16 in) of precipitation during the wettest month July, distributed over 21 rainy days.

In contrast, November offers drier and sunnier days, with around 173 mm (6.8 in) of rainfall over 17 rainy days.

July, the wettest month, has a maximum daytime temperature of 25°C (77°F). The city receives 135 hours of sunshine in this period. During the driest month November you can expect a temperature of 9°C (48°F). For more detailed insights into the city's temperatures, visit our Omachi Temperature page.

Omachi's average annual precipitation is 2875 mm (113 in). Let's compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 644 mm (25 in), evenly distributed across the year with no extreme wet or dry seasons.

In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.

In Tokyo, Japan, the average annual precipitation is 1528 mm (60 in), with significant summer rains due to typhoon season.

Kuala Lumpur, Malaysia, receives 2529 mm (100 in) of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.

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.

The proximity of a location to a large body of water can significantly affect its rainfall patterns:

• Ocean Influence: Coastal regions typically receive more rainfall due to the presence of moisture-laden winds from the ocean. These regions tend to have more humid climates and experience more frequent precipitation, especially in winter.
• Continental Climates: Areas further from the sea, such as inland or continental regions, experience less frequent rainfall and more extreme seasonal variations in precipitation.

• "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 Omachi's weather, including sunshine hours, humidity levels, and temperature data, visit our Omachi Climate page.