Tornado activity: Halfmoon-area historical tornado activity is slightly above New York state average.It is 49% smaller than the overall U.S. average.. On 6/24/1960, a category F3 (max. wind speeds 158-206 mph) tornado 4.4 miles away from the Halfmoon town center injured 9 people and caused between $5,000,000 and $50,000,000 in damages.