Will the weather still be cold after the Rain Water? Is it already warm during the Rain Water period?
The climate varies greatly between the north and south during the Rain Water solar term. In the south, the weather warms up and has entered early spring, while in the north, it is still winter, and even the largest snowfall of the year may occur.North China region
Snow is an important symbol of winter. Actually, the time with the most snowfall and heavy snow in the middle and lower reaches of the Yellow River and its surrounding areas is not "Light Snow" or "Heavy Snow," nor is it "Minor Cold" or "Major Cold" (because the temperature is even lower and there is less moisture in the atmosphere at that time), but rather the Rain Water solar term in spring.
Northwest and Northeast regions
During the Rain Water solar term, the northwest and northeast of China have not yet left the scope of winter. According to the average temperature in February: the monthly average temperatures of Lanzhou, Xining, Urumqi, and Shenyang are -1.0°C, -3.9°C, -9.7°C, and -6.9°C respectively, indicating that these areas have not yet escaped the cold of winter. The weather remains cold, and precipitation is mainly in the form of snow.
Southwest and Jiangnan regions
During the Rain Water period, except for the southern part of Yunnan, which is already filled with spring scenery, most parts of the Southwest and Jiangnan still show the scene of early spring: warm sunlight, cool and damp mornings and evenings, green fields, and warm spring river water.
Southern China region
During the Rain Water solar term, the Southern China region is full of spring vitality, with flowers blooming everywhere.
The average temperature in February for the following cities in the Southern China region is: Guangzhou 14.5°C, Nanning 14.1°C, Haikou on Hainan Island 18.7°C. The average rainfall in February for these cities is 69.4 mm, 42.6 mm, and 35.0 mm respectively. Although the rainfall is several times more than in the middle and lower reaches of the Yellow River, the high temperature and large evaporation rate still make this area water-deficient.
Features of the Rain Water Solar Term
During the Rain Water solar term, rain begins and the amount of precipitation gradually increases. The meaning of the Rain Water solar term is the beginning of rain, with increasing precipitation. In the Yellow River basin, where the 24 solar terms originated, the weather was cold before the Rain Water, and snowflakes were flying, making it difficult to hear the sound of drizzling rain. After the Rain Water, the temperature generally rises above 0°C, and snow decreases while rain increases. However, in the warmer southern regions, even in the depth of winter, rain is not uncommon. During this period, the average temperature in most parts of southern China is above 10°C, with peach and plum blossoms in bud and cherry blossoms in bloom, clearly entering the spring season climatically.From a meteorological perspective, after the Rain Water, the maximum temperature in most parts of China usually rises above 0°C, and the average temperature in many southern regions is above 10°C. At this time, oilseed rape and winter wheat are generally regreening and growing, and they require a lot of water.
As the saying goes, "Spring rain is as precious as oil," and suitable precipitation is very important for crop growth. However, during this time, the amount of precipitation in North China, Northwest, and the Huaihe River region is generally low. If there is little rain in early spring, timely irrigation before and after the Rain Water can help crops grow. Over time, people also use the temperature and precipitation during the Rain Water to predict future weather changes. For example, proverbs mention "If it rains during the Rain Water, it will be cloudy and overcast until the Grain in Ear," "Cold rain water, warm Awakening of Insects," "Warm rain water, cold Awakening of Insects," or "If the wind blows from the east during the Rain Water, there will be rain in the summer."
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