Guyu (谷雨), literally translated as grain rain, is one of the 24 traditional Chinese solar terms. It usually falls from April 19 to 21 when the sun reaches the celestial longitude of 30. It indicates that there will be plentiful rainfall and it is the best time for sowing in agriculture.
Due to the maritime climate, the temperature increase in coastal areas is normally slower than in the inland regions. The temperature of coastal areas at this time is normally 15-16℃ (59-60.8oF), and that of the other areas is around 16-18℃ (60.8-64.4oF).
Warm weather and abundant rainfall are good for the growth of cross-winter crops and the sprouting of seeds, but too much rainfall, or drought, will significantly affect the output of agriculture produces.
Guyu is the period that temperature differs greatly during day and night, and weather changes unpredictably. Because of warm and wet air currents, the whole country, especially southern China, usually experiences heavy rainy days.
During Guyu, people still need to keep warm and shouldn't forget to bring umbrellas or raincoats when going out.