When Is Hurricane Season?
QUICK ANSWER
Atlantic hurricane season officially runs June 1 to November 30, with peak activity from mid-August to mid-October. The Eastern Pacific hurricane season starts earlier on May 15 and ends November 30. The Western Pacific and Indian Ocean have year-round activity with seasonal peaks. About 90% of hurricane activity occurs during these defined seasons.
Hurricane season is the defined annual period when tropical cyclones are most likely to form. The exact dates vary by ocean basin based on long-term climatology of when warm waters and atmospheric conditions favor hurricane development. Understanding hurricane season helps coastal residents and travelers prepare appropriately and helps emergency managers position resources for peak activity periods.
When is Atlantic hurricane season?
The Atlantic hurricane season officially runs from June 1 through November 30 each year. These dates encompass when about 97% of Atlantic tropical cyclone activity occurs. The season was extended from June 15 to June 1 in 1965 because activity in late June was becoming more common. Some years see storms form outside these dates (especially in May after recent warming), but the official season provides a useful framework for forecasting, emergency planning, and research. The Atlantic includes the North Atlantic Ocean, Caribbean Sea, and Gulf of Mexico.
When is the peak of hurricane season?
Atlantic hurricane season peaks from mid-August through mid-October, with the absolute peak around September 10. According to the National Hurricane Center's climatology data, about 78% of all Atlantic hurricane activity occurs during this peak window. The peak is driven by maximum ocean water temperatures in late summer, minimal wind shear, and African easterly waves producing many tropical disturbances. After mid-October, water temperatures cool and wind shear increases, gradually reducing favorable conditions. Late-season storms in October and November are still common but typically less intense than peak-season storms.
When are other basins' hurricane seasons?
Different ocean basins have different hurricane seasons based on local climatology. Eastern Pacific runs May 15 to November 30, peaking in August-September. Western Pacific has year-round typhoons with peak from July to October. The North Indian Ocean has two seasons (April-June and September-December), the result of monsoon transition periods. The South Indian Ocean and South Pacific have hurricane (cyclone) seasons from November to April, opposite to Northern Hemisphere timing because seasons are reversed south of the equator.
Why does hurricane season have these specific dates?
Hurricane season dates reflect the climatology of when conditions favor tropical cyclone formation. Ocean waters need to be at least 80°F, which happens later in summer in most basins. Atmospheric conditions including wind shear and moisture also vary seasonally. African easterly waves (which seed many Atlantic hurricanes) peak in mid-summer. The combination produces a clear seasonal cycle. The specific official dates are chosen to capture the active period while not extending too far before or after, balancing inclusiveness with practical utility for planning.
When is Atlantic hurricane season?
The Atlantic hurricane season officially runs from June 1 through November 30 each year. These dates encompass when about 97% of Atlantic tropical cyclone activity occurs. The season was extended from June 15 to June 1 in 1965 because activity in late June was becoming more common. Some years see storms form outside these dates (especially in May after recent warming), but the official season provides a useful framework for forecasting, emergency planning, and research. The Atlantic includes the North Atlantic Ocean, Caribbean Sea, and Gulf of Mexico.
When is the peak of hurricane season?
Atlantic hurricane season peaks from mid-August through mid-October, with the absolute peak around September 10. According to the National Hurricane Center's climatology data, about 78% of all Atlantic hurricane activity occurs during this peak window. The peak is driven by maximum ocean water temperatures in late summer, minimal wind shear, and African easterly waves producing many tropical disturbances. After mid-October, water temperatures cool and wind shear increases, gradually reducing favorable conditions. Late-season storms in October and November are still common but typically less intense than peak-season storms.
When are other basins' hurricane seasons?
Different ocean basins have different hurricane seasons based on local climatology. Eastern Pacific runs May 15 to November 30, peaking in August-September. Western Pacific has year-round typhoons with peak from July to October. The North Indian Ocean has two seasons (April-June and September-December), the result of monsoon transition periods. The South Indian Ocean and South Pacific have hurricane (cyclone) seasons from November to April, opposite to Northern Hemisphere timing because seasons are reversed south of the equator.
Why does hurricane season have these specific dates?
Hurricane season dates reflect the climatology of when conditions favor tropical cyclone formation. Ocean waters need to be at least 80°F, which happens later in summer in most basins. Atmospheric conditions including wind shear and moisture also vary seasonally. African easterly waves (which seed many Atlantic hurricanes) peak in mid-summer. The combination produces a clear seasonal cycle. The specific official dates are chosen to capture the active period while not extending too far before or after, balancing inclusiveness with practical utility for planning.
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