Climate

Lake Cowal is located on the boundaries of the south-eastern semi-arid and the south-eastern temperate regions of Australia. Historical data has been collated from weather stations from Condobolin, Forbes and Wyalong. The temperature ranges from 32.7ºC in January to 2.8ºC in July. Morning humidity ranges from 21% in October to 39% in June. Lake Cowal is strongly influenced by winds from the southwest with wind speeds usually in the vicinity of 6-10 kph and sometimes up to 20 kph in summer.

Rainfall is said to be evenly distributed throughout the year but rainfall events are often erratic. The largest rainfall events recorded have occurred in January, with 140.5 mm falling in one 24 hr period. Average annual rainfall is 481 mm but the annual average pan evaporation is 2045 mm.