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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 temperature for the year in San Diego is 63.6°F (17.6°C). The warmest month, on average, is August with an average temperature of 71.6°F (22°C). The coolest month on average is December, with an average temperature of 56.5°F (13.6°C).
The highest recorded temperature in San Diego is 111.0°F (43.9°C), which was recorded in September. The lowest recorded temperature in San Diego is 29.0°F (-1.7°C), which was recorded in January.
The average amount of precipitation for the year in San Diego is 10.3" (261.6 mm). The month with the most precipitation on average is February with 2.3" (58.4 mm) of precipitation. The month with the least precipitation on average is July with an average of 0.0" (0 mm). There are an average of 41.5 days of precipitation, with the most precipitation occurring in February with 7.1 days and the least precipitation occurring in August with 0.4 days.
In terms of liquid precipitation, there are an average of 42.0 days of rain, with the most rain occurring in January with 7.0 days of rain, and the least rain occurring in July with 0.0 days of rain.