The climate is classified as C(w2)(w)bi(g) under the Koppen classification system which means a sub humid temperate climate with a long summer, winter rain of less than 5%, isothermal with maximum temperatures occurring before the summer solstice . The area has a rainy and dry season with the rainy season extending from mid May to mid October. Most precipitation occurs on the sides of the Nevado de Toluca of up to 1200 mm per year. The valley floor receives and average of 900 mm per year. Almost all precipitation occurs during the rainy season with most coming in June. After this, there is a short dry spell in August before rains return in September.