Global Distribution of Precipitation

Relatively complex pattern
Related to global wind and pressure patterns
High pressure regions
Subsiding air
Divergent winds
Dry conditions
e.g., Sahara and Kalahari deserts

Related to global wind and pressure patterns
Low pressure regions
Ascending air
Converging winds
Ample precipitation
e.g., Amazon and Congo basins

Related to distribution of land and water
Large landmasses in the middle latitudes often have less precipitation toward their centers
Mountain barriers also alter precipitation patterns
Windward slopes receive abundant rainfall from orographic lifting
Leeward slopes are usually deficient in moisture