Pending home sales in April slumped for the second consecutive month and were down year-over-year nationally and in all four major regions, according to the National Association of Realtors. Only the West saw an increase in contract signings last month.

The Pending Home Sales Index, a forward-looking indicator based on contract signings, decreased 1.3 percent to 109.8 in April from a downwardly revised 111.3 in March. After last month's decline, the index is now 3.3 percent below a year ago, which is the first year-over-year decline since last December and the largest since June 2014 (7.1 percent).

Lawrence Yun, NAR chief economist, says contract activity is fading this spring because significantly weak supply levels are spurring deteriorating affordability conditions. "Much of the country for the second straight month saw a pullback in pending sales as the rate of new listings continues to lag the quicker pace of homes coming off the market," he said. "Realtors are indicating that foot traffic is higher than a year ago1, but it's obviously not translating to more sales."