Type 1 Climate in the Philippines: Provinces with Tropical Rainforest Conditions

The Philippines' climate classification system (Coronas) designates Type 1 as areas with two pronounced seasons: dry (November–April) and wet (May–October)—but the term is sometimes colloquially used for the perennially wet, tropical rainforest zones in the eastern seaboard.

Provinces Commonly Associated with Type 1 / Rainforest Climate

• Cagayan (northern Luzon, Sierra Madre face)
• Isabela (eastern slopes, heavy orographic rainfall)
• Aurora (Pacific-facing, no dry month)
• Quezon (Bondoc Peninsula, Polillo Islands)
• Camarines Norte (Bicol Peninsula, northeast exposure)

Clarification

Technically, these provinces exhibit Type II climate (no dry season, maximum rain November–January) under the Coronas system. "Type 1" in the strict sense applies to western Luzon, Ilocos, and parts of the Visayas with a distinct dry season. The confusion arises because eastern provinces are often discussed together as the "rainforest belt."

Ecological Significance

These areas host the country's largest remaining dipterocarp forests, critical watersheds, and biodiversity hotspots (Philippine eagle, rafflesia, endemic orchids). Conservation priority is high due to logging, mining, and agricultural encroachment.