Updated with a report from the Federal Housing Finance Agency.NEW YORK ( TheStreet) -- Home prices across the U.S. edged up marginally in August. The S&P/Case-Shiller index of national home prices in 20 U.S. cities ticked up 0.2% in August after a 0.9% decline in July. Prices dropped 3.8% in the 20-city index compared to levels a year earlier. The decline was more than the forecasted 3.5% drop, according to ThomsonONE Analytics. Half of the 20 cities pooled by the index saw an increase in home prices over the month of August, while 16 of the 20 cities saw prices improve on an annual basis. The recent figures show a "modest glimmer of hope," said David Blitzer, chairman of S&P's index committee. Blitzer noted that monthly increases in prices during the spring and summer had to be taken with a grain of salt, but that improvement in August numbers were "good news." "The Midwest is one region that really stands out in terms of recent relative strength. Chicago, Detroit and Minneapolis have all posted very sharp monthly increases going back to May," added Blitzer. "These markets were some of the weakest during the crisis."