Massachusetts’s Precipitation Record

The official 24-hour rainfall record for the state of Massachusetts is 18.15 inches observed at Westfield, MA (Hampden County) on August 18-19, 1955 was a result of Hurricane Diane. The extreme rainfall produced by Diane caused widespread flooding across portions of New England.

Did You Know?

In August 1955, two named tropical systems impacted southern New England and caused significant flooding across the region. Hurricane Connie produced up to 7 inches of rain over parts of Massachusetts on August 11th and 12th; saturating the ground and raising stream levels prior to the heavy rainfall from Hurricane Diane, a week later.