Severe weather during June in the U.S. Midwest, Plains and Southeast caused more than $2 billion in total damage, while powerful thunderstorms with large hail accounted for one of Canada’s worst-ever weather losses at more than $1 billion, brokerage Aon PLC said in its monthly catastrophe update released Thursday.

A series of thunderstorms swept across southern Alberta on June 13-14, bringing hail as large as tennis balls and causing extensive damage and flooding throughout the greater Calgary metro region, Aon said.

The storms wrought “significant damage” to thousands of homes, vehicles and agricultural land, with total economic losses estimated at up to $1.25 billion, roughly three-quarters of which was covered by insurance, Aon said. “This becomes one of the costliest thunderstorm-related events on record in Canada,” it said.

In the U.S., severe weather hit parts of the Plains, Midwest and Northeast June 2-4, causing economic losses of roughly $550 million, much of which was insured, Aon said.

Wind and hail hit South Dakota on June 4, causing “extensive damage” to residential and commercial properties, and some $380 million in economic losses, three-quarters of which is insured, Aon said.

A severe weather outbreak across much of the eastern two-thirds of the U.S. from June 5-11 caused extensive wind-related damage from Colorado to the Dakotas and straight-line winds, large hail, isolated tornadoes and flash flooding in parts of Illinois, Indiana, Michigan and Ohio. Total economic losses were estimated to be $800 million, with more than $600 million insured.

Tropical Storm Cristobal became the second-earliest landfall on record in Louisiana when it came ashore near Grand Isle on June 7 with 50 mph winds, storm surge, heavy rainfall, and convective storms across the Southeast, with total economic losses tentatively estimated at $325 million.

Globally, substantial and dangerous flooding in China during June caused economic losses listed by the government at $5.1 billion, according to Aon.