The climate in Thailand is typically tropical; rainy, warm, cloudy southwest monsoon (mid-May to September); dry, cool northeast monsoon (November to mid-March); southern isthmus always hot and humid. The terrain: central plain; Khorat Plateau in the east; mountains elsewhere. For Bangkok in January the daily average maximum temperatures is 33°C with the average minimum 23°C, while in June the average maximum is 34°C with a minimum of 26°C. The wettest month for Bangkok is September with an average of 308.3mm of precipitation falling while the driest month is December with 9.9mm falling.