With less than 1.5°C between its hottest and coldest months, FSM experiences very little seasonal variation in mean air temperatures. Mean annual temperature (1901-2016) is 27.1°C. Mean annual precipitation (1901-2016) stands at 3,810.4mm. The wet season takes place between May and September, with the West Pacific Monsoon affecting rainfall in the western islands by contributing additional rain. The extreme weather events that occur in FSM include typhoons, storm waves, droughts and flooding.
- Annual maximum air temperatures at three sites across FSM (Pohnpei, Yap and Chuuk) have risen between 0.10 - 0.14°C per decade since the 1950s.
- There is variation in air temperature trends within FSM. For the state of Pohnpei, the greatest trends involve minimum air temperature, whereas for Yap, the greater trends are observed in maximum air temperature.
- Annual and seasonal rainfall trends measured over the period 1950-2009 are not statistically significant.
- The driest year on record for most of Micronesia happened in 1998, the consequence of an El Niño in 1998.
This section provides the options to visualize historical climate data for different timeframes via map and annual cycle chart.