Used vehicles sold at auction depreciated 1 percent in June compared with a 0.4 percent rate in May, which is typical for summer months, according to Black Book.

Mid-size pickups led all vehicle segments with a monthly retention rate of 1.1 percent. Cargo minivans recorded the second-best month with a 0.5 percent retention rate. Full-size pickups also gained ground at 0.1 percent.

The 21 other vehicle categories tracked by Black Book fell in value led by entry mid-size cars at 2.7 percent, compact cars at 2.5 percent, and full-size cars at 2.4 percent. Examples of entry mid-size cars include the Ford Fusion, Chevrolet Malibu, Toyota Prius, and Buick Regal.

Entry level cars sold for the lowest average value at $8,547, while premium sporty cars sold for the highest average value at $49,136. The report analyzed sales of used vehicles from model years from 2009 to 2013.