The winter wallop may have chilled housing activity in some parts of the country, but overheated home prices are really what are slowing sales nationwide.

Home buyers signed 2.5 percent fewer contracts in January to buy existing homes compared to December. The expectation had been for a slight gain. The so-called pending home sales index from the National Association of Realtors, an indicator of future closed sales, is now just 1.4 percent higher than it was in January of 2015. Pending sales have been higher annually for 17 straight months, but this is the second smallest gain in that time.