Case-Shiller publishes a home price index on the last Tuesday of the month. The index measures the price of a three-month moving average and is published with a two month lag. In January, the report is showing the index for home prices in November 2011.
November saw a continuation of the softening of housing prices. In only 3 of 20 markets measured did the prices rise, fully 17 of 20 saw a decline. This continues a trend that started roughly in early summer 2010.