 The 1851 Atlantic hurricane season was the first Atlantic hurricane season to be included in the official Atlantic tropical cyclone record . Six known tropical cyclones occurred during the season , the earliest of which formed on June 25 and the latest of which dissipated on October 19 . These dates fall within the range of most Atlantic tropical cyclone activity . None of the cyclones existed simultaneously with another . Of the six storms , two only have a single point in their track known . 
