Tropical cyclones in 2013

Throughout 2013, 139 tropical cyclones formed in seven different areas called basins. Of these, 67 have been named by various weather agencies when they attained maximum sustained winds of 35 knots (65 km/h, 40 mph). The strongest and deadliest tropical cyclone of the year was Typhoon Haiyan, which was estimated to have a minimum barometric pressure of 895 hPa and caused at least 6,300 deaths in the Philippines. The costliest tropical cyclone of the year was Hurricane Manuel, which was responsible for at least $4.2 billion worth of damages in Mexico. 21 major tropical cyclones formed in 2013, including five Category 5 tropical cyclones. The accumulated cyclone energy (ACE) index for the 2013 (seven basins combined), as calculated by Colorado State University was 618.5 units.

Global atmospheric and hydrological conditions
The El Niño–Southern Oscillation stayed in its neutral phase throughout the year, with no major fluctuations towards either an El Niño or La Niña event. However, during May and June, sea temperatures in the far eastern tropical Pacific Ocean were well below average. By October, though, they returned to normal.

North Atlantic
The 2013 Atlantic hurricane season was a very inactive season, featuring only two hurricanes and no major hurricanes.

Eastern Pacific
The 2013 Pacific hurricane season featured nine hurricanes, including Hurricane Manuel, the second costliest Pacific hurricane on record.

Western Pacific
The 2013 Pacific typhoon season was the most active season since the 2004 season, deadliest since 1975, and featured Typhoon Haiyan, one of the strongest tropical cyclones to ever exist.

January
January was very active, featuring fourteen systems, with seven of them being named.

February
February was slightly above-average, featuring eleven systems, with five of them being named.

March
March was slightly below-average featuring eight systems, of which only two were named.

April
April was slightly below-average, with six systems forming, with three of them being named.