Climate Central breaks it down:
With about six weeks remaining in the year, there have already been 11 natural disasters that have cost $1 billion or more in damage, bringing 2012 to second place on the list of top billion-dollar disaster years. The current record-holder is 2011, when there were 14 billion-dollar disasters. The widespread and intense drought — which as of Nov. 6 still covered at least 60 percent of the lower 48 states — and Hurricane Sandy are expected to go down in history as two of the most costly weather-related disasters since 1980.