- 26,470 millimetre(s)
- India (Cherrapunji)
Between 1 August 1860 and 31 July 1861, a total of 26,470 mm (1,042 in) of rain fell at Cherrapunji in Meghalaya, India, according to the World Meteorological Organization.
In monsoon season, clouds that coalesce above the Bay of Bengal pass undisturbed over the plains of Bangladesh but begin to rise when they reach the Khasi Hills, where Cherrapunji is located. As they do so, they unleash heavy rainfall.