Because as humans have explored the world more and more maps are getting more and more accurate.
People have recycled and planted many trees and plants that will gives fresh air and more of it is here today.
No. The accuracy becomes poorer and poorer the further into the future it stretches. A forecast for the next hour will be very accurate, the next day reasonably accurate, but for next week it can go...
The Philipines is a big place, weather may be different in different parts, just like USA.
yes