Phonsavan experiences a cool and dry winter season from November to February, with temperatures ranging from 10-20°C. As spring approaches in March, temperatures rise gradually, averaging around 23°C, with highs reaching up to 27°C. The summer months of April and May are hot and humid, with temperatures often soaring above 30°C. Autumn returns in June, bringing cooler temperatures, typically ranging from 15-25°C.