全球温差最大的地区——上扬斯克每年深秋到来年春末,北极和西伯利亚地区寒冷的气流常常像潮水般地滚滚而来,使我国北方广大地区出现北风呼啸、大雪纷飞、剧烈降温和霜冻天气。这种冷空气活动就是我们常说的“寒流”。当一天内气温猛降10℃以上,而最低气温在5℃以下,并伴有6级 The region with the highest temperature difference in the world - the late autumn of each year In the late spring of next year, the cold airstreams in the Arctic and Siberia often roll over like tidal waves, causing the north wind to whistle, heavy snowfall, severe cooling and frost weather in the vast northern part of our country. This cold air activity is what we often say “cold current.” When the temperature plunges more than 10 ℃ in one day, the lowest temperature is below 5 ℃, accompanied by 6 levels