Severe weather in the US last month is expected to generate insurance losses of more than $US500 million ($670.34 million), according to Impact Forecasting.

Five separate events affected the country, the Aon Benfield subsidiary says in its monthly global catastrophe report.

Severe thunderstorms hit parts of the Rockies and northern plains from June 3-8, causing widespread damage.

In Colorado, including Denver, giant hailstones, winds, flash floods and tornadoes caused damage.

From June 9-11 severe storms hit several cities in the Great Lakes region, in the northeast.

Large hailstones fell around Chicago and storms caused flash flooding. Insurers say losses in Illinois approached $US60 million ($80.45 million). Total economic losses for these storms are estimated at more than $US100 million ($134.09 million).

Elsewhere, New Zealand’s North Island suffered floods on June 20, causing economic losses of more than $US82 million ($109.95 million). More than 400 residents were evacuated. 

Early data from the Insurance Council of New Zealand shows more than 2000 claims have been filed, totalling $US6.9 million ($9.25 million).

In northern China severe weather caused significant damage to crops and property, generating economic losses of $US145 million ($194.49 million).

A heatwave in Pakistan claimed more than 1240 lives in the second half of the month.