寒潮 每年的10月到第二年的4月,常常有源于北冰洋新地岛附近洋面的强寒冷空气,流经西伯利亚和蒙古,然后侵入我国。我们通常把造成降温地区范围广(强大的寒潮往往在两三天内就可以扫遍我国的大部分地区,冲向南海)、降温幅度大(一般在24小时内,气温急剧下降10℃以上,同时这一天的最低气温在5℃或以下,并出现5～7级大风)、持续时间长(一般在一周左右)的强冷空气,叫做寒潮。平均而言,全国性寒潮每年约 The cold wave From October of each year to April of the second year, it is often active in the strong cold air of the ocean near Xindi Island in the Arctic Ocean, which flows through Siberia and Mongolia and then invades our country. We usually have a wide range of cooling areas (strong cold wave often sweeps across much of our country in two or three days, rushes to the South China Sea) and cools down (usually within 24 hours, the temperature drops sharply above 10°C. The coldest air on this day with a minimum temperature of 5°C or below and a 5 to 7-level gale and long duration (usually around a week) is called a cold wave. On average, the national cold wave is about annually