Weather Talk: What is the heaviest rain on Earth?
When a thunderstorm produces an inch of rain, it is often casually referred to as a heavy rain. But other than temporary street flooding, an inch of rain typically causes no problems in our area. Much heavier rains on the order of 5-10 inches have happened in the past with much costlier impacts.
The rainiest place in the United States is on the windward slope and at the summit of Hawaii's Mt. Waiʻaleʻale. Average annual rainfall is 452 inches. It rains on an average of 360 days a year, and daily rainfalls of 20-30 inches are common.
The wettest place on Earth is the village of Mawsynram in Meghalaya, India, which receives 467 inches of rain per year. In terms of a single storm, in 2014, the World Meteorological Organization (WMO) confirmed a world record 48-hour rainfall of 98.15 inches on June 15-16, 1995, in Cherrapunji, India.