Pago Pago has been named one of the wettest places on Earth. Due to its warm winters, the plant hardiness zone is 13b. It receives  of rain per year. The rainy season lasts from October through May, but the town experiences warm and humid temperatures year-round. Besides it being wetter and more humid from November–April, this is also the hurricane season. The frequency of hurricanes hitting Pago Pago has increased dramatically in recent years. The windy season lasts from May to October. As warmer easterlies are forced up and over Rainmaker Mountain, clouds form and drop moisture on the city. Consequentially, Pago Pago experiences twice the rainfall of nearby Apia in Western Samoa. The average yearly rainfall in Pago Pago Harbor is , whereas in neighboring Western Samoa, it is around  per year.