How does rainfall vary across New South Wales?

Rainfall in New South Wales varies significantly across the state, largely influenced by the orographic effect as terrain rises toward the tablelands.1

The distribution of annual precipitation generally declines as one moves northwestward:1

• Coastal Districts: These areas receive the highest rainfall, ranging from 35 inches (900 mm) in the south to 60 inches (1,500 mm) or more in the north.1
• Tablelands: Precipitation is enhanced here due to the orographic effect of the rising landscape.1
• Western Division: This semiarid region experiences marked rainfall deficiency. Approximately one-tenth of the state, located in the far west, receives less than 10 inches (250 mm) annually, while about one-fifth of the state receives between 10 and 15 inches (250 and 380 mm).1

Natural threats such as drought and flood are common, with drought conditions often linked to the El Niño effect in Pacific Ocean waters.1