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Most / Least Educated Cities in AZ. The average temperature of Vernon is 51.76Â°F, which is much lower than the Arizona average temperature of 65.97Â°F and is lower than the national average temperature of 54.45Â°F.
Sponsored Topics. Vernon is a city in Wilbarger County, Texas, United States. As of the 2000 census, the population was 11,660; it was 11,077 in the 2005 census estimate. Vernon is the county seat of Wilbarger County. Vernon is the birthplace of rock and roll singer/musician Roy Orbison and jazz trombonist Jack Teagarden.