The 1867 Atlantic hurricane season featured the San Narciso hurricane, one of the deadliest tropical cyclones to impact the Virgin Islands and Puerto Rico. A total of nine known tropical systems developed during the season, with the earliest existing by June 21 and the last dissipating on October 31. Of the nine cyclones, seven intensified into hurricanes, one of which became a major hurricane. However, in the absence of modern satellite and other remote-sensing technologies, only storms that affected populated land areas or encountered ships at sea were recorded, so the actual total could be higher. An undercount bias of zero to six tropical cyclones per year between 1851 and 1885. 9 storms, 7 hurricanes, 1 major hurricanes (Category 3+). Strongest: an unnamed storm (125 mph). Accumulated cyclone energy ≈ 60. Wiki link