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The average temperature of Saint George is 56.23Â°F, which is much higher than the Utah average temperature of 49.55Â°F and is higher than the national average temperature of 54.45Â°F.
St. George, Utah â Monthly Climate Averages. St. George is located within the northern extension of the Mojave Desert. The desert climate contributes to generally clear skies, relatively mild winters and hot summers. Residents and visitors enjoy over 300 days of sunshine per year. The temperature varies from a low in January and December of 31Â°F to 102Â°F in July. The elevation in St. George is 2,880 feet above sea level, rising to over 10,000 feet in the Pine Valley Mountainsâonly 20 miles to the North.