Tropical cyclone climatology
2024年03月11日
Global Tropical Storm Formation
Approximately 85 tropical storms annually develop over the world's warm tropical oceans.
Cyclone, Hurricane, and Typhoon Development
More than half (45) of these storms intensify into tropical cyclones, known regionally as hurricanes or typhoons.
Geographical Distribution
72% of these tropical storms form in the Northern Hemisphere. The remaining 28% develop in the Southern Hemisphere.
The diagram below illustrates the seasonal tropical cyclone activity across various basins.

Average annual cycle of tropical cyclone occurrence for each ocean basin. The abscissa spans the 13 months, December through January of the following year; the ordinate is the number of storms per hundred years. For each day, the graph shows the number of years that a cyclone was present (normalized per 100 years). The blue line represents all tropical cyclones (surface winds greater than 17 m s-1 or 34 knots); shading represents tropical cyclones of hurricane strength (surface winds greater than 33 m s-1 or 64 knots).
NOAA/NWS/NHC
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