During winter, the island experiences continental high pressure systems from Mongolia and Siberia, and is influenced primarily by the northeastern monsoon climate. In summer, the island's weather is controlled by the marine high pressure system formed above the Pacific Ocean, with a humid, southwestern monsoon climate. Meanwhile, the island's high mountains and the surrounding oceans contribute to the city's distinctive seasonal differences. Spring lasts from March through May; summer, June through August; fall, September through November; and winter, December through February of the following year.
The meteorological data for 2015 collected by the Taipei Weather Station and provided by the Central Weather Bureau are as follows: