The official Atlantic hurricane season runs from June through November, but occasionally storms form outside those months. September is the most common month for hurricanes making landfall in the U.S., followed by August and October, according to an analysis of 1851 to 2015 data by the National Oceanic and Atmospheric Administration. No hurricanes made U.S. landfall before June and after November during the period studied.
2021 Hurricane Season
Atlantic Basin: The 2021 Atlantic basin hurricane season will have above-normal activity according to an April 8, 2021 Colorado State University forecast by atmospheric scientist and Triple-I non-resident scholar, Dr. Phillip Klotzbach and his team. The scientists cite weak La Niña conditions and warmer than normal subtropical Atlantic sea surface temperatures for the above-average probability for major hurricanes making landfall along the continental United States coastline and in the Caribbean. The group forecasts 17 named storms, eight hurricanes and four major (category 3 and above) hurricanes for 2021. The averages for 1981 to 2020, which were developed and adopted in April 2021, are 14 named storms, seven hurricanes and three major hurricanes. The forecast will be updated on June 3.
Tropical storm Ana, the first storm of the 2021 Atlantic hurricane season, formed as a subtropical storm on May 22 and became a tropical storm the next day. Ana makes 2021 the seventh consecutive year to have a named storm form before the official start of the hurricane season on June 1, according to Colorado State University atmospheric scientist and Triple-I non-resident scholar, Dr. Phillip Klotzbach. Ana dissipated by May 24 northeast of Bermuda, according to the National Hurricane Center.