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The climate throughout much of Mexico is characterized by high temperatures and moderate to low rainfall. The highland climates vary considerably with elevation,
but the central plateau generally has a moderate climate with few extremes of hot or cold. Mexico City, for example, has an average July
high temperature of 23°C (74°F) and an average January high temperature of 21°C (70°F). Cities at lower elevations on the
plateau have somewhat warmer climates. The northern and central areas of the plateau are arid and semiarid, with the drier
regions receiving about 300 mm (about 12 in) of rainfall annually. Rainfall increases in the southern regions of the plateau,
which receive about 500 to 650 mm (20 to 26 in) of rainfall annually, with most of it typically falling in the summer. Traditional
rainfall patterns in the Valley of Mexico
have been altered by substantial industrial pollution, which has become so serious that the rainy and dry seasons no longer
follow a regular annual cycle
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