"If extreme rainfall events continue to intensify, we can expect to see floods occurring more frequently around the world.
"Assuming an increase in global average temperature by 3 to 5 degrees Celsius by the end of the 21st century, this could mean very substantial increases in rainfall intensity as a result of climate change," Westra said.
The majority of weather stations showed an increase in rainfall. The largest increase in rainfall occurred in tropical nations.
"Most of these tropical countries are very poor and thus not well placed to adapt to the increased risk of flooding, which puts them in a larger threat of devastation," said Westra.
Westra's study was published in the Journal of Climate.
IMAGE: Newcastle, New South Wales, Australia flooded in 2007 (Roderick Breis, Wikimedia Commons)