Since 1900, 14 hurricanes have made landfall in the northeast, 5 at Category 3. In coastal counties of the northeast, $5.3trillion of insured exposure is at risk.
A large storm in the N.E. could provide a scenario that results in total insured losses of USD 20.7 billion, which corresponds to roughly a 1% exceedance probability for the Northeast.
http://www.air-worldwide.com/Publications/Infographics/Northeast-Hurricane-Risk/