NEW YORK (CNNMoney.com) -- Home prices rose 0.8% in April compared with March and were up 3.8% from a year ago, according to the S&P/Case-Shiller Home Price Index of 20 major housing markets.
That good news is tempered by a couple of factors. First, the one-year comparison was against a low-ebb mark. In April 2009, prices were just above a five-year low. Overall, prices are off 30% from their peak
Secondly, the improvement came during a time when the federal government was heavily subsidizing home sales through an $8,000 homebuyer's tax credit. That credit is about to expire.
"Other housing data confirm the large impact, and likely near-future pullback, of the federal program," said David Blitzer, a spokesman for Standard and Poor's.
Once the tax credit fully expires, home prices are likely to take a beating, according to Pat Newport, a housing market analyst for IHS Global Insight.
"The housing glut and foreclosures will drive the national Case-Shiller index down another 6% to 8%, with prices bottoming in 2011," he said.
The strongest rebound has been in California, where S&P tracks three major markets. San Francisco prices jumped 2.2% month-over-month and are up 18% year-over-year, more than any other city in the 20-city index.
San Diego prices rose 0.7% compared with March and 11.7% since April 2009. Los Angeles prices rose 7.8% over the past 12 months, and 0.7% in April.
The biggest loser over the past 12 months has been Las Vegas, down 8.5%. Prices rose there 0.3% there month-over-month.
Only two cities saw values fall during the month. Miami prices fell 0.8% for the month, which pushed the city into negative territory for the year at -0.5%. New York dropped 0.3% month-over-month and is off 1% year-over-year. 
| Overnight Avg Rate | Latest | Change | Last Week |
|---|---|---|---|
| 30 yr fixed | 3.80% | 3.88% | |
| 15 yr fixed | 3.20% | 3.23% | |
| 5/1 ARM | 3.84% | 3.88% | |
| 30 yr refi | 3.82% | 3.93% | |
| 15 yr refi | 3.20% | 3.23% |
Today's featured rates:
| Index | Last | Change | % Change |
|---|---|---|---|
| Dow | 32,627.97 | -234.33 | -0.71% |
| Nasdaq | 13,215.24 | 99.07 | 0.76% |
| S&P 500 | 3,913.10 | -2.36 | -0.06% |
| Treasuries | 1.73 | 0.00 | 0.12% |
| Company | Price | Change | % Change |
|---|---|---|---|
| Ford Motor Co | 8.29 | 0.05 | 0.61% |
| Advanced Micro Devic... | 54.59 | 0.70 | 1.30% |
| Cisco Systems Inc | 47.49 | -2.44 | -4.89% |
| General Electric Co | 13.00 | -0.16 | -1.22% |
| Kraft Heinz Co | 27.84 | -2.20 | -7.32% |
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