During the summer, high pressure areas over central Australia regularly move dry and warm air into the contest area. Such conditions usually start with good Cu-Thermals in the first days and blue thermals up to 10,000ft or more in the days thereafter. Common cloud bases are around 8,000ft to 10,000ft AGL.
The topography within 3 kilometres of Narromine contains only modest variations in elevation, with a maximum elevation change of 32 metres and an average elevation above sea level of 240 metres. Within 16 kilometres contains only modest variations in elevation (205 metres). Within 80 kilometres contains significant variations in elevation (591 metres).
The area within 3 kilometres of Narromine is covered by cropland (44%), sparse vegetation (26%), artificial surfaces (20%), and trees (11%), within 16 kilometres by cropland (67%) and sparse vegetation (25%), and within 80 kilometres by cropland (56%) and sparse vegetation (31%).
The length of the day in Narromine varies significantly over the course of the year. In 2022, the shortest day is 21 June, with 10 hours, 2 minutes of daylight; the longest day is 22 December, with 14 hours, 16 minutes of daylight.