Places with heavy rains from November to January and with no distinct season are eastern parts of Southern Luzon particularly eastern part of Quezon, Bicol Region, the eastern islands of Visayas such as Samar, Leyte and the eastern islands and districts of Mindanao.
Those noticeably wet From June to November and dry from November- April are the northwest parts of Luzon such as Pagudpud, Laoag, Vigan, La union, Pangasinan and Zambales. Others are Manila, Batangas, Palawan, Occidental Mindoro, the western side of Panay Island and Negros Occidental.
Rainfalls evenly distributed through out the year are in the Northeast districts of Luzon such as Baler, Cagayan, Sierra Madre, Isabela and the eastern part of Mindoro such as Oriental Mindoro, the western parts of the Bicol Region, Marinduque Island, Bohol, western part of Leyte, the western areas of Mindanao from Lanao Del Norte and Del Sur, Cotabato, Davao to the island of Basilan, excluding Zamboanga.
Areas with rains from June to November and mostly dry From November to May are the Central areas of Luzon and some central areas of the Visayas including eastern parts of Panay such as Kalibo, Roxas City , Iloilo, others are Boracay, Negros Oriental, Cebu City and Moalboal.
These powerful winds carrying water from the ocean are returning every year, reason why they are often associated with the concept of season (monsoon comes from the Arabic word mausin):
from the southeast (Pacific Ocean) from May to October, Storms and Typhoons carrying heavy rains, especially to the eastern part of the country.
from the northwest from November to April, not rain intensive.
The monsoons are actually drawing very distinct seasonal schemes in the Philippines. Hence, three seasons are observed throughout the year, more distinctively in the northwestern parts of the country:
Winter from December to February (cool and dry)
Summer from March to May (hot and dry)
rainy season from June to November