average temperature Flagstaff Arizona
Most / Least Educated Cities in AZ. The average temperature of Flagstaff is 48.42Â°F, which is much lower than the Arizona average temperature of 65.97Â°F and is much lower than the national average temperature of 54.45Â°F.ost / Least Educated Cities in AZ. The average temperature of Flagstaff is 48.42Â°F, which is much lower than the Arizona average temperature of 65.97Â°F and is much lower than the national average temperature of 54.45Â°F.