The lowest monthly average temperature in Santee for December is 56 degrees. The most monthly precipitation in Santee occurs in January with 0 inches. The air quality index in Santee is 22% worse than the national average. The pollution index in Santee is 96% better than the national average.
According to the US Census Bureau's population clock, the estimated 2015 United States population (July 2015) is over 321.3 million. This differs a bit from the 325.1 million estimated by the United Nations.
According to the 2017 revision of the World Population Prospects the total population was 48,653,419 in 2016, compared to only 12,342,000 in 1950. The proportion of children below the age of 15 in 2015 was 24.3%, 68.7% was between 15 and 65 years of age, while 7% was 65 years or older .