A cover for promoting local rainfall is provided. The cover has a skin to cover a field where can get thermal energy. An edge part of the skin is substantially kept at a height at or near a surface of the field, and the inner part of the skin surrounded by the edge part can be lifted up from the surface of the field to form a space to accommodate air. The air inside the skin receives the thermal energy, and the skin prevents the air inside the skin and the air outside the skin from communicating with each other to reduce thermal energy loss from inside to outside of the skin, thereby creating a temperature difference between the inside of the skin and the outside of the skin. Utilizing buoyancy produced by the air temperature difference between inside and outside of the skin to lift up the inner part of the skin, and thus, a huge space is formed between the skin and the surface of the field to contain a large amount of air. Then, the air inside the skin keeps on receiving the thermal energy, and thus huge thermal energy is stored in the hot air covered by the skin, and the air covered by the skin can be used to promote local rainfall. A method for promoting local rainfall is also provided.一種促使局部地區降雨之覆蓋體，其外皮用以覆蓋在能接受到熱能的場地上，使其外皮之邊緣部分大致保持在場地表面之高度，邊緣以內的部分則可以被推升，形成空間容納空氣。使其內空氣接受熱能及藉外皮阻隔其內外側空氣互相流通減低其內熱能的向外傳遞而造成內外溫度差。利用其內較外高溫的空氣產生的浮力推升外皮邊緣以內的部分，因而使外皮與場地表面之間形成巨大的空間容納巨量空氣，再繼續接受熱能而蓄存巨量熱能於其覆蓋的空氣中，得使用所覆蓋的熱空氣促使局部地區的降雨。本發明另提供一種促使局部地區降雨之方法。
