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Santa Ana Winds in San Diego County often reach their greatest intensity during November, particularly at the mountain passes, where dry air from a high-pressure area over the interior deserts swoops coastward toward a low-pressure area offshore. The subsiding air warms rapidly while it descends, resulting in 80°-90° temperatures close to the coast. While passing over the mountains, though, the dry air can be surprisingly cool -- 60° or less in the daytime.
Santa Ana Winds in San Diego County often reach their greatest intensity during November, particularly at the mountain passes, where dry air from a high-pressure area over the interior deserts swoops coastward toward a low-pressure area offshore. The subsiding air warms rapidly while it descends, resulting in 80°-90° temperatures close to the coast. While passing over the mountains, though, the dry air can be surprisingly cool -- 60° or less in the daytime.