monsoon low

A seasonal low found over a continent in the summer and over the adjacent sea in the winter.

Examples are the lows over the southwestern United States and India in summer and those located off lower California and in the Bay of Bengal in winter. Palmer (1951) points out that, while the winter and summer monsoon lows appear similar on mean charts, they are dynamically quite different.
Compare thermal low.
Palmer, C. E. 1951. Compendium of Meteorology. p. 873.

1. The study of the physics, chemistry, and dynamics of the earth's atmosphere, including the related effects at the air–earth boundary over both land and the oceans. Fundamental topics include the composition, structure, and motion of the atmosphere. The goals ascribed to meteorology are the complete understanding and accurate prediction of atmospheric phenomena.