Under of annual precipitation are average, with over 348 days of sunshine per year. The hottest temperature ever recorded there was on July 6, 1905. The mean annual temperature is . Indio is in the Colorado Desert region of the Sonoran Desert. It is adjacent to the geologic Salton Sink and within the site of historic Lake Cahuilla of the Lower Colorado River Valley. Indio is an official National Bird Sanctuary, because of the seasonal bird migration flight routes that cross the town en route to the Salton Sea. The 2010 United States Census reported that Indio had a population of 76,036. The population density was 2,604.9 people per square mile (1,005.8/km2). The racial makeup of Indio was 46,735 (61.5%) White (27.0% Non-Hispanic White), 1,805 (2.4%) African American, 741 (1.0%) Native American, 1,693 (2.2%) Asian, 55 (0.1%) Pacific Islander, 22,394 (29.5%) from other races, and 2,613 (3.4%) from two or more races. Hispanic or Latino of any race were 51,540 persons (67.8%). There were 23,378 households, out of which 10,522 (45.0%) had children under the age of 18 living in them, 13,149 (56.2%) were opposite-sex married couples living together, 3,578 (15.3%) had a female householder with no husband present, 1,512 (6.5%) had a male householder with no wife present. There were 1,654 (7.1%) unmarried opposite-sex partnerships, and 232 (1.0%) same-sex married couples or partnerships; 3,859 households (16.5%) were made up of individuals, and 1,777 (7.6%) had someone living alone who was 65 years of age or older. The average household size was 3.21. There were 18,239 families (78.0% of all households); the average family size was 3.60. The population was spread out, with 22,879 people (30.1%) under the age of 18, 7,247 people (9.5%) aged 18 to 24, 20,705 people (27.2%) aged 25 to 44, 15,793 people (20.8%) aged 45 to 64, and 9,412 people (12.4%) who were 65 years of age or older.