Phnom Penh has a tropical wet and dry climate (Köppen climate classification ''Aw''). The climate is hot year-round with only minor variations. Temperatures typically range from  and weather is subject to the tropical monsoons. The southwest monsoon blows inland bringing moisture-laden winds from the Gulf of Thailand and Indian Ocean from May to November. The northeast monsoon ushers in the dry season, which lasts from December to April. The city experiences the heaviest precipitation from September to October with the driest period in January and February.