Out of the nation's 10 largest cities, Philadelphia's homicide rate is the worst. Last year ended with 324 homicides, up from 306 in 2010. And just one month into this year, there has been on average more than one homicide each day in the city. Temple criminal justice professor Jerry Ratcliffe says it's important to put Philadelphia's homicide data into a broader perspective: "I don't want to belittle the numbers, but it's really too difficult to assess the safety of the entire city based on little over a month of data," he said. "The real test will be this spring or summer when we (normally) see the violence peak."