When the southwest monsoon winds of summer blow, afternoon thundershowers are common on Yangmingshan. A waving sea of blooming Silvergrass (Miscanthus floridules) greets visitors who come during October. Fall on Yangmingshan is enlivened by the red of maple leaves and the gold of other trees. When the misty autumn rains come to the mountains, spectacular rainbows sometimes span the valleys. The northeasterly rains of winter frequently bring a chill wind and drizzly rain. The cold and high humidity of this season often creates an otherworldly tableau of mist and cloud. When winter cold fronts arrive, Mt. Chihsing, Mt. Chutzu, and Mt. Tatun are sometimes dusted by snow.