Rainforests are characterized by high rainfall, with definitions setting minimum normal annual rainfall between 2,000 mm (about 78 inches or 2 meters) and 1700 mm (about 67 inches).
Rainforests are recognized by their high water content, with guidelines specifying that the average annual precipitation must be no less than 2,000 millimeters (approximately 78 inches or 2 meters) and up to 1,700 millimeters.