Other major highways that run through the city include Georgia State Route 91, Georgia State Route 133, Georgia State Route 234, and Georgia State Route 520. The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Albany has a humid subtropical climate, abbreviated "Cfa" on climate maps. Albany receives well above the national average amount of precipitation. Much of this comes in the form of heavy showers and thunderstorms. According to "Cities Ranked and Rated" (Bert Sperling and Peter Sander), Albany reports thunder on 86 days per year. This is more than twice the national average. According to the United States Census Bureau, the Albany, Georgia Metropolitan Statistical Area (MSA) had an estimated population of 157,308 and ranked 252nd in the U.S. in 2010. The MSA consists of Dougherty, Terrell, Lee, Worth, and Baker Counties. As of the census of 2010, there were 77,434 people, 29,781 households, and 18,515 families residing in the city. The population density was 1,385.5 people per square mile (535.0/km²). There were 33,436 housing units at an average density of 577.3 per square mile (222.9/km²). The racial makeup of the city was 71.6% black, 25.2% Caucasian, 0.2% Native American, 0.8% Asian, 0.1% Pacific Islander, 0.9% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 2.1% of the population. Of the 29,781 total households, 29.2% had children under the age of 18 living with them, 29.7% were married couples living together, 27.7% had a female householder with no husband present, and 37.8% were non-families. Households of individuals living alone made up 31.8% of the total, and 9.4% were someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 3.11. In the city, the population was spread out, with 27.8% under the age of 18, 13.0% from 18 to 24, 27.7% from 25 to 44, 19.6% from 45 to 64, and 11.3% who were 65 years of age or older.