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This climate type occurs primarily on the periphery of the true deserts in low-latitude semiarid steppe regions. It is transitional to the tropical wet-dry climate on the equatorward side and to the mediterranean climate on its poleward margin, with a cooler, wetter winter resulting from the higher latitude and mid-latitude frontal cyclone activity. Annual precipitation totals are greater than in tropical and subtropical desert climates. Yearly variations in amount are not as extreme as in the true deserts but are nevertheless large.
The Köppen Climate Classification subtype for this climate is "BSk". (Tropical and Subtropical Steppe Climate).
The average amount of precipitation for the year in San Marcial is 9.6" (243.8 mm). The month with the most precipitation on average is August with 2.1" (53.3 mm) of precipitation. The month with the least precipitation on average is February with an average of 0.2" (5.1 mm). There are an average of 39.0 days of precipitation, with the most precipitation occurring in August with 8.0 days and the least precipitation occurring in April with 1.0 days.
In San Marcial, there's an average of 6.4" of snow (0 cm). The month with the most snow is December, with 2.2" of snow (5.6 cm).