List of off-season Atlantic hurricanes

[1][2] Between 1938, when the United States Weather Bureau began issuing tropical cyclone warnings as a collaborative observation network for cities along the U.S. coastline, and 1963, the season was defined between June 15 and November 15.

As of 2023[update], there have been 92 off-season cyclones recorded in the official Atlantic hurricane database, which dates back to 1851.

Off-season cyclones are most likely to develop in the central to western Atlantic Ocean, and most do not make landfall.

That same storm was estimated to have reached winds of 105 mph (169 km/h), making it the strongest hurricane between December and May; the strongest currently in the official database was a March hurricane in 1908 that reached winds of 100 mph (160 km/h).

Of all cyclones during the off-season, Hurricane Lili in 1984 lasted the longest, for a total of 12 days.

The National Hurricane Center issues names for tropical and subtropical cyclones once their winds reach 39 mph (63 km/h).

Before 1950, storms were numbered based on their appearance in the Atlantic hurricane database; tropical depressions were unnumbered.

Satellite image of the most recent Atlantic off-season system, an unnamed subtropical storm on January 16, 2023
Tracks of all known storms that formed during the off-season between 1851 and 2023.
Radar image of a hurricane near the Lesser Antilles. The storm features a well-defined, clear eye surrounded by a mass of intense convection. Rotating feeder bands, curving into the system, are present around the entire hurricane.
Radar image of Hurricane Alice in 1955, the first recorded North Atlantic hurricane to span two calendar years.