立夏为我国大部分地区夏季开始的日期。立夏以后,全国各地气温显著上升,长江以南地区平均气温在20℃以上,华北地区气温也在20℃左右,东北大部分地区气温上升到10℃以上。进入6月,全国气温已在15℃以上,大部分地区在20℃以上。小暑以后的7月进入一年中最热的天气,此时南北气温相差不大,绝大部分地区日平均气温在24℃~28℃,高海拔地区气候比较凉爽。此时,黄河流 The beginning of summer is the beginning of summer in most parts of China. After the beginning of the summer, the temperatures in all parts of the country increased significantly. The average temperature in the area south of the Yangtze River was above 20 ℃. The temperature in North China was also around 20 ℃. The temperature in most parts of Northeast China rose to above 10 ℃. Into June, the national temperature has been above 15 ℃, most areas in more than 20 ℃. After the summer heat into the hottest year of the year in July, when the temperature difference between North and South little difference, the average daily temperature in most parts of the 24 ℃ ~ 28 ℃, relatively cool climate at high altitude. At this point, the Yellow River