After high prices stuck around a bit longer than expected in May following the close of tax season, the auction price declines in June more than doubled.

According to Black Book data, prices for vehicles model years 2009-2013 fell an average of 1 percent. This is compared to a decline of 0.4 percent in May.

Black Book analysts said these trends are “signaling typical summertime patterns.”

“The annual depreciation patterns typically see larger value changes in the second half of each year, and we’ve seen this begin to pick up the pace over the last 45-60 days,” said Ricky Beggs, editorial director at Black Book. “We will keep a watchful eye on how gas prices and the new model year impact this pace of depreciation as we head through the summer months.”

Black Book pointed out another trend that points to the summer slowdown: Six vehicle segments, all cars, had a monthly depreciation change higher than 1.5 percent, compared with none at this rate in May.

Those six segments were entry midsize cars (down 2.7 percent month-over-month); compact cars (down 2.5 percent); full-size cars (down 2.4 percent); upper midsize cars (down 1.8 percent); entry-level cars (down 1.8 percent); and sporty cars (down 1.6 percent).

Consistent with trends seen earlier this year, trucks continue to see stronger price retention in the lanes.

Domestic cars fell by an average of 2 percent, while domestic trucks only dropped 0.5 percent.

For foreign automakers, cars saw prices fall by 1.4 percent in June, while import trucks dropped by 0.8 percent.

Along that same trend, the midsize pickup segment held the strongest price retention this past month, with prices actually rising by 1.1 percent.

This is one of three segments that saw a price spikes in June. The midsize pickups were followed by the cargo minivans — which climbed 0.5 percent — and full-size pickups, which rose by 0.1 percent.

Highlighting car segment movement, the premium sporty cars had the strongest month-over-month retention in June among cars, dropping by 0.6 percent.

Black Book pointed out this segment was also the only car segment among the top 12 for strongest price retention rates in June.

The average price for premium sporty cars at the end of June was $49,136, a 12.3-percent drop from year-ago levels ($56,048), according to Black Book data.

On the other end of the spectrum, the entry midsize cars led all car segments for the greatest month-over-month price drop. The segment saw prices fall by 2.7 percent in June.

The average segment price at the end of June was $12,539, an 11.4-percent drop from the same periof of 2013 ($14,155).

Though truck depreciation was much softer overall, compact crossovers and passenger minivans led the truck segments with the largest depreciation rates last month – both segment saw prices fall by 1.4 percent month-over-month.

And the price declines haven’t slowed much this month so far.

According to the latest “Beggs on the Used Car Market” report, auction prices for the car segments dropped an average of $45 last week.

For more on last week’s wholesale price movement, see the below Auto Remarketing story:

1 Car Segment Stands Out in Lanes