Laos has a tropical monsoon climate

Laos has a tropical monsoon climate, with a pronounced rainy season from May through October, a cool dry season from November through February, and a hot dry season in March and April. Generally, monsoons occur at the same time across the country. Temperatures range from highs around 40 °C (104 °F) along the Mekong in March and April to lows of 5 °C (41 °F) or less in the uplands of Xiangkhoang and Phôngsali in January.