Yamanouchi Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Yamanouchi, Nagano Prefecture, Japan. These averages rely on historical data collected over 30 years, from 1990 to 2020. Let's explore the details to provide you with a complete overview.
Yamanouchi has a relatively rain/snowy climate with high precipitation levels, averaging 1874 mm (74 in) of rain/snowfall annually. Despite the high annual total, it does experience a distinct rainy season during certain months. Examine our detailed charts below to understand these seasonal patterns.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
The climate in Yamanouchi shows significant variation throughout the year. Expect 246 mm (9.7 in) of precipitation during the wettest month July, distributed over 23 rainy days.
In contrast, November offers drier and sunnier days, with around 105 mm (4.1 in) of rainfall over 17 rainy days.
July, the wettest month, has a maximum daytime temperature of 27°C (81°F). The city receives 170 hours of sunshine in this period. During the driest month November you can expect a temperature of 11°C (52°F). For more detailed insights into the city's temperatures, visit our Yamanouchi Temperature page.
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in June
Explore Yamanouchi's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Yamanouchi spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Japan: City Comparison
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.
heavy rainfall
high
moderate
low
almost none
Yamanouchi vs World: Rainfall Compared
Yamanouchi's average annual precipitation is 1874 mm (74 in). Let's compare this to some popular worldwide tourist destinations:
Boston, USA, experiences 1238 mm (49 in) of annual precipitation, including significant snowfall during the winter.
Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm (39 in) of annual rainfall, mostly in the summer.
Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.
Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.
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.
- "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 Yamanouchi's weather, including sunshine hours, humidity levels, and temperature data, visit our Yamanouchi Climate page.
