To most people, Yangmingshan in the spring means flowers blooming everywhere as pretty as a picture; in the summer, it's the perfect place to go to beat the heat; in the autumn, hillsides covered in flowering silvergrass, and the occasional tree with red leaves, bring a touch of wistfulness to the land; while amid the sharp winds and pelting rain of winter, a rare glimpse of pale sunshine or a sudden snowfall will bring special delight. These changing aspects show the freshness of Yangmingshan's scenery at every season of the year.
Situated at approximately 25 degrees north latitude, subtropical Yangmingshan has a clearly differentiated monsoon climate. In summer, southwesterly monsoon winds bring clear mornings with afternoon thundershowers; in winter, northeasterly monsoon winds bring humid, rainy weather.
Yangmingshan's annual rainfall is 4000 millimeters, with at least 190 rainy days a year. The park's high elevation makes it three or four degrees cooler than nearby Taipei basin, cold in winter and cool in summer. Its mountainous topography and complex terrain mean that there can be clear microclimatic contrasts between different areas of the park: sometimes it can be raining in the east yet clear in the west. Clear skies can be abruptly overcast by sudden swirls of thick mist which rise so fast you would hardly believe it unless you see it for yourself.
One big feature of the park's mountains is their abundant water vapor, which at different times and in differing circumstances condenses into mist, lowlying cloud, rain, dew, frost or snow, appearing in many guises as it drifts around between the trees on the mountainsides. Occasionally, as the sky brightens after rain, a brilliant rainbow can be seen arching across the valley yet another breathtakingly lovely sight.