The climate of the Goolwa to Wellington LAP area is strongly influenced by topography and the ameliorating effects of the ocean.
Rainfall ranges from 900mm in the Mount Lofty Ranges along the western edge of the Goolwa to Wellington LAP area and tapers off to 500mm on the eastern flanks of the Ranges. Rainfall on the plains to the east of the ranges declines to approximately 350mm at the Murray River near Wellington.
The northern side of Lakes Alexandrina and Albert is in the rain shadow of the Mount Lofty Ranges and receives in the order of 400mm annual average rainfall. The southern part of Lakes Alexandrina and Albert receive higher rainfall due to the influence of coastal weather patterns.
The weather is usually more moderate in the hills and near the coast, with temperatures frequently 5 to 10 degrees cooler than those in Adelaide. Frosts are common throughout the hills in the winter and early spring. Frosts are rare at the coast but occur on the plains.