47 inches of rain. In one week.

Data from NASA's Tropical Rainfall Measuring Mission or TRMM satellite was used to create a rainfall map of the severe rains that fell in Thailand recently. More than 20 people have been killed in southern Thailand over the past week due to flooding and mudslides caused by extremely heavy rainfall...

The analysis showed that rainfall for the past week over the Malay Peninsula was particularly extreme with totals of almost 1200 mm (~47 inches). TRMM satellite data revealed that rainfall in that area was frequently falling at a rate of over 50 mm/hr (~2 inches).

Further details at NASA.