Unusually early snow storms in north-central China have claimed 40 lives, caused thousands of buildings to collapse and destroyed almost 200,000 hectares of winter crops, the country's Civil Affairs Ministry said Friday.

Nineteen of the deaths resulted from traffic accidents related to the storms, which began Nov. 9, the ministry said in a statement on its website.

The snowfall is the heaviest in the northern and central provinces of Hebei, Shanxi, Shaanxi, Shandong and Henan since record keeping began after the establishment of the Communist state in 1949, the ministry said without giving detailed figures. It estimated economic losses from the storm at 4.5 billion yuan, or about $700 million Cdn.

Chinese state media say some of the snow was induced through cloud seeding, although the precise amount of snowfall in all areas was not reported, and it wasn't clear what the previous records were. Cloud seeding is a way of artificially increasing precipitation by introducing a chemical substance into the air.

Hebei's provincial capital, Shijiazhuang, received the heaviest snowfall — 9.4 centimetres — on Nov. 10, the day of the heaviest flurries. Neighboring Beijing, which usually suffers through long, cold and extremely dry winters, reported about 2.5 centimetres.

More than 7.5 million people have been stranded or otherwise affected by the storms, which caused the collapse of more than 9,000 buildings, damaged 190,000 hectares of crops and forced the evacuation of 158,000 people, the ministry said.

State media have reported at least two deaths were caused by the collapse of buildings, including a school cafeteria.

Three waves

Beijing has been hit by three successive waves of snow, causing havoc on roadways and forcing the cancellation or delay of scores of flights.

The capital and surrounding areas are little prepared to deal with such heavy snow, with few plows or road de-icing supplies. Snow tires and chains are almost unknown, and many drivers simply leave their cars at home and turn to public transport in such conditions.

The impact has been far greater in the surrounding provinces of Hebei, Shanxi, Shaanxi, Shandong and Henan, where highways have been closed, schools shuttered and crews sent to rescue people in their snowbound homes.

Freak snow and ice storms last year hit parts of eastern and southern China unaccustomed to such weather. Those storms paralyzed key transport systems just as millions of migrant workers were heading home for the lunar New Year holiday, leading to more than 80 deaths and billions of dollars in damage.