The Insurance Board of Canada said summer storms resulted in $350 million in claims in Ontario.
That does not include crop coverage provided by the federal and Ontario governments.
The most expensive of four catastrophies was between August 23 and August 25 when more than 200 mm of rain fell on some communities, including Harrow, Amherstburg, and Kingsville.
The storms also spawned three tornadoes in the region - an EF1 near Cottam, a second in Tecumseh, and an EF-0 in West Windsor.
Insurance companies paid out $110-milllion when the remnants of Hurricane Hilary swept through.
A month earlier, thunderstorms on July 20 and July 21 produced strong wind gusts and spawned two tornadoes near South Buxton and Petrolia. A microburst in Sarnia brought down trees and powerlines.
Another line of supercell thunderstorms a week later toppled trees in Windsor and caused tennis ball-sized hail and flash flooding in Ottawa.
Each of those catastrophes caused $30 million in damage.
