Papua New Guinea's Two Monsoon Seasons: Northwest and Southeast

Yes, Papua New Guinea experiences a tropical monsoon climate with two distinct seasonal wind/rain regimes:

1. Northwest Monsoon (December–March) – "Wet Season"

• Winds from NW (Asian winter monsoon extension).
• Heavy, persistent rain – tropical downpours, thunderstorms.
• Flooding, landslides, transport disruption common.
• Primary agricultural planting season.
• High humidity, temps 27–31°C.

2. Southeast Monsoon (May–October) – "Dry Season" (Relatively)

• Winds from SE (Australian winter high pressure).
• Drier, cooler, steadier – but not rain-free.
• Shorter, intermittent showers; lower humidity.
• Best time for travel, trekking (Kokoda), diving.
• Harvest season for coffee, cocoa, copra.

Transition Months

• April & November: Variable, shifting winds, localized storms.

Regional Variation

Highlands: cooler, less seasonal rain variation. Islands (Bougainville, New Britain): more consistent rainfall. Port Moresby (rain shadow): much drier (~1,000 mm vs. 3,000+ mm elsewhere).

PNG's monsoons drive agriculture, health (malaria), transport, and cultural calendars.