The Commerce Department reported Thursday that new home sales dropped by 3 percent last month to a seasonally adjusted annual sales pace of 1.131 million units. It was the first decline since an 11.5 percent drop in February.
The government also marked down sales activity in May to a pace of 1.166 million units, substantially below its initial estimate of 1.234 million units.
Analysts pointed to the drop in sales last month and the downward revision for May as fresh evidence that housing was slowing considerably from the impact of higher mortgage rates.
Sales of both new and existing homes set records for five consecutive years as the housing industry enjoyed a boom powered by the lowest mortgage rates in four decades.
But rates have risen this year as the Federal Reserve tightens credit conditions in hopes of slowing the economy and keeping inflation in check.
Mortgage rates retreated slightly this week. The 30-year mortgage dropped to 6.72 percent, down from a four-year high of 6.80 percent last week, but still a percentage point above where rates were at this time last year.
The drop in rates this week was credited to Fed Chairman Ben Bernanke, whose comments were interpreted by the markets as signaling that the central bank's two-year string of rate increase could be ending.
The government reported that the median price of a new home was $321,300 in June. That was 2.3 percent higher than a year ago but 1.5 percent lower than in May.
Analysts said the drop in new home sales was consistent with the slowdown shown this week in sales of existing homes, which fell for the eighth time in the past 10 months.
"The housing market peaked a year ago and has been slowly deflating ever since," said Mark Zandi, chief economist at Moody's Economy.com. "We can expect another year of lower sales with price declines in some parts of the country."