List of off-season Pacific hurricanes

There have been 26 recorded tropical and subtropical cyclones in the North-eastern Pacific basin outside the official Pacific hurricane season. The National Hurricane Center (NHC) monitors the area from North America westward to 140°W, while the Central Pacific Hurricane Center is from 140°W to the International Date Line, north of the equator. The National Oceanic and Atmospheric Administration (NOAA) currently defines the season as starting May 15 in the eastern Pacific and June 1 for the central Pacific and ending on November 30 for both regions in each calendar year. Occasionally, however, storms develop in late November and persist until December.

Few off-season tropical cyclones in the east Pacific have affected land, and none of them have made landfall. Only Hurricane Nina caused both property damage and fatalities. It prompted evacuations in Hawaii and caused $100,000 (1957 USD) in damage in the state. The storm also killed four people and produced waves. The strongest hurricane between December and May was Hurricane Ekeka in 1992, which reached winds of . In 1997, after Tropical Storm Paka crossed the International Date Line, it intensified into a typhoon with winds equivalent to a Category 5 hurricane on the Saffir–Simpson hurricane wind scale, and caused $580 million (1997 USD) in damage in the Marshall Islands, Guam, and the Northern Mariana Islands. The most recent off-season storm is Tropical Storm Andres in mid-May 2021.

The beginning of HURDAT, the official Pacific hurricane database maintained by the NHC, is 1949. Since then, thirteen storms have occurred outside the official bounds of hurricane season in the eastern and central north Pacific, respectively. The first storm officially to occur outside of the current season was Hurricane Nina in 1957. In addition, the CPHC reports nine off-season storms from 1900 to 1952 with another off-season tropical cyclone occurring in 1832. There have been documents published in the Monthly Weather Review reporting additional off-season storms within of the Mexican coastline, including one in December. Of all off-season tropical cyclones, the "Froc Cyclone" lasted longest, spanning 12 days and two calendar years. The year with the most off-season storms was tied between 1904 and 1992, with a total of two tropical cyclones. No Pacific hurricane season had both a pre-season and post-season storm.

Chronology

The wind speeds listed are maximum one-minute average sustained winds. The category refers to the intensity on the Saffir–Simpson hurricane wind scale; TS stands for tropical storm, and TD for tropical depression.

+ Chronology of off-season Northeastern Pacific tropical cyclones Storm Season Duration Peak classification Maximumsustained winds Notes Unnamed1832Unknown 1902Unknown 1904Unknown 1904Unknown 1906Unknown Unnamed1922Unknown Unnamed1925Unknown Unnamed1936Unknown Unnamed1938Unknown The Monthly Weather Review was uncertain if the storm was a tropical cyclone Nina 1957Category 1 hurricane Caused $100,000 in damage and four fatalities in Hawaii Carmen 1980Tropical storm Winnie 1983Category 1 hurricane Strongest east Pacific tropical cyclone in the month of December; caused minor rainfall in parts of Mexico. Winona 1989Tropical storm Alma 1990Category 1 hurricane Ekeka 1992 Strongest off-season east Pacific tropical cyclone Hali 1992Tropical storm One-E 1996Tropical storm Assumed to have caused two deaths after the ship Solar Wind was lost at sea Paka 1997Tropical storm Later became a super typhoon in the West Pacific Omeka 2010Tropical storm Was subtropical from December 18–20 in central Pacific, was in the western Pacific from December 20–22, and tropical on December 22 onward in the central Pacific Aletta 2012Tropical storm Nine-C 2015Tropical depressionLatest formation of a tropical cyclone in the eastern Pacific basin. Pali 2016Category 2 hurricaneEarliest formation of a tropical cyclone in the eastern Pacific basin. Adrian 2017Tropical storm One-E 2018Tropical depression One-E2020Tropical depressionEarliest formation of a tropical cyclone in the eastern Pacific basin proper (east of 140°W). Andres2021Tropical storm Earliest named storm in the East Pacific basin proper.

Systems by month Off-season storms are most likely to occur in December, followed by May. Only one cyclone each was reported in February or in March.

List of off-season Pacific hurricanes

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