Achi Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Achi, 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.

Achi has a relatively rain/snowy climate with high precipitation levels, averaging 2323 mm (91 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 seasons in Achi, bring significant changes in precipitation. The wettest month, July, receives heavy rainfall, with an average of 322 mm (13 in) of precipitation. This rainfall is distributed across 22 rainy days.

In contrast, the driest month, December, experiences much less snow/rainfall, totaling 103 mm (4.1 in) over 16 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

July, the wettest month, has a maximum daytime temperature of 27°C (81°F). The city receives 165 hours of sunshine in this period. During the driest month December you can expect a temperature of 7°C (45°F). For more detailed insights into the city's temperatures, visit our Achi Temperature page.

Achi's average annual precipitation is 2323 mm (91 in). Let's compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 620 mm (24 in), evenly distributed across the year with no extreme wet or dry seasons.

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

Adelaide, Australia, enjoys 511 mm (20 in) of annual precipitation, with dry summers and wet winters.

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.

Climate change is affecting precipitation patterns worldwide, including Achi:

• 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.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

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