Which precipitation and vegetation descriptions best fit an Aw climate in the Köppen classification? Which precipitation and vegetation descriptions best fit an Aw climate in the Köppen classification? Well-defined winter dry season; savanna with drought-tolerant trees Every month has 6 cm of precipitation or more; lush tropical vegetation At least 10 times as much precipitation in a summer month as the driest winter month; vegetation short and thick Well-defined summer dry season; vegetation sparse Short dry season, precipitation of driest month has less than 6 cm but equal to or greater than 10-R/25; thick green vegetation