Mexico City has a subtropical highland climate (Köppen climate classification Cwb), due to its tropical location and high elevation. The lower region of the valley receives less rainfall than the upper regions of the south; the lower boroughs of Iztapalapa, Iztacalco, Venustiano Carranza and the west portion of Gustavo A. Madero are usually drier and warmer than the upper southern boroughs of Tlalpan and Milpa Alta, a mountainous region of pine and oak trees known as the range of Ajusco.
The average annual temperature varies from 12 to 16 °C (54 to 61 °F), depending on the altitude of the borough. The lowest temperatures, usually registered during January and February, may reach -2 to -5 °C (28 to 23 °F), and are usually accompanied by snow showers on the southern regions of Ajusco. The maximum temperatures of late spring and summer may reach up to 32 °C (90 °F). Overall precipitation is heavily concentrated in the summer months, and includes dense hail. The central valley of Mexico rarely gets precipitation in the form of snow during winter; the two last recorded instances of such an event were on March 5, 1940 and January 12, 1967.
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