The vast territory of China spans
nearly 40 latitudinal degrees, most of which is
in the temperate zone, with a small part extending
south into the tropical and subtropical zones
and the northernmost tip close to the Frigid Zone.
There are perennial icy and snowy zones in some
alpine regions. China is a world-renowned monsoon
region, where most parts are cold and dry in winter
and hot and rainy in summer. Diverse temperature
belts and arid and humid areas have formed the
country's complex climate; a complexity
that is enhanced by the country's
variegated landform. The northern part of Heilongjiang
Province has long winter but no summer, while
the Hainan Island has long summer but no winter.
The Hai River valley is marked by distinct seasonal
changes, but it is spring all year round in the
southern Yunnan- Guizhou Plateau. In the northwest
hinterland, the temperature changes strikingly.
China's high tundra zone is in the
southwest of the Qinghai- Tibet Plateau, where
the temperature is low all the year round. Some
deserts are perennially dry and rain-poor.