What is the reason for the poem "Plum is yellow and sunny"

This poem is about the scene of early summer. As can be seen from the following poems.

1, Plum Blossom Yellowstone. At this time, it is the rainy season in the south of the Yangtze River, and the solar term is from the awning to the slight summer heat, that is, from early June to early July. The middle and lower reaches of the Yangtze River are also called Huangmei season, Huangmei season and so on. Meteorology says that this rain belt lingers in Huang Meiyu, south of the Yangtze River for a long time. It is rare to have such good weather in Huangmei, and the poet's mood is naturally cool, and the more he swims, the more cool he is.

2. "Green Shade". In summer, the tree has a light green shadow, indicating that the leaves have grown and formed. These leaves are no longer the sparse shape and goose yellow in spring, but the coolness in the shade.

3. Bo Huang. Living in broad-leaved forests in temperate and tropical regions, it is a summer migratory bird in China. "After the rain clears, I will stay in Wangchuan," wrote the poem of the Tang Dynasty poet Wang Wei. "An egret flies over a quiet swamp, and a mango bird sings in a tree in midsummer." .

Add four or five orioles.