Hokkaid? is known for its relatively cool summers and icy winters. Most of the island falls in the humid continental climate zone with K�ppen climate classification Dfb (hemiboreal) in most areas but Dfa (humid continental) in some inland lowlands. The average August temperature ranges from 17 to 22 �C (62.6 to 71.6 �F), while the average January temperature ranges from -12 to -4 �C (10.4 to 24.8 �F), in both cases depending on elevation and distance from the ocean, though temperatures on the western side of the island tend to be a little warmer than on the eastern.
The northern portion of Hokkaido falls into the taiga biome, with significant snowfall. Snowfall varies widely from as much as 11 metres (400 in) on the mountains adjacent to the Sea of Japan down to around 1.8 metres (71 in) on the Pacific coast. The island tends to see isolated snowstorms that develop long-lasting snowbanks, in contrast to the constant flurries seen in the Hokuriku region. Total precipitation varies from 1,600 millimetres (63 in) on the mountains of the Sea of Japan coast to around 800 millimetres (31 in) (the lowest in Japan) on the Sea of Okhotsk coast and interior lowlands and up to around 1,100 millimetres (43 in) on the Pacific side.
Unlike the other major islands of Japan, Hokkaido is normally not affected by the June�July rainy season and the relative lack of humidity and typically warm, rather than hot, summer weather makes its climate an attraction for tourists from other parts of Japan.
In winter, the generally high quality of powder snow and numerous mountains in Hokkaid? make it one of Japan's most popular regions for snow sports. The snowfall usually commences in earnest in November and ski resorts (such as those at Niseko, Furano and Rusutsu) usually operate between December and April. Hokkaido celebrates its winter weather at the Sapporo Snow Festival.
During the winter, passage through the Sea of Okhotsk is often complicated by large floes
