1. A method for determining a score indicating an assessment of web traffic for a selected website over a selected timeframe, the method comprising: identifying a plurality of independent metrics with regard to web traffic, each metric indicating a performance indicator of the selected website; receiving user input including an expected metric value for each metric of the plurality of metrics; obtaining, from a data store, historical data including web traffic information for the selected website and web traffic information for a peer website; evaluating the web traffic information for the selected website to determine an actual metric value for each of the plurality of metrics with regard to the selected website; evaluating the web traffic information for the peer website to determine a corresponding metric value for each of the plurality of metrics with regard to the peer website; calculating, in accordance with a model, a parameter health score for each of a plurality of assessment parameters for each metric, wherein the assessment parameters provide different assessments of each metric based upon the actual metric value for each metric, the different assessments including: a value assessment of the metric that compares the actual metric value for the metric against the expected value for the metric, a historical assessment of the metric that compares the actual metric value for the metric against historical data for the metric, and a peer assessment of the metric that compares the actual metric value for the metric to a corresponding metric value with regard to the peer website; calculating, in accordance with the model, a metric health score for each metric of the plurality of metrics based upon averaging the parameter health scores calculated for the plurality of assessment parameters for each metric; and determining, in accordance with the model, a composite overall health score assessing web traffic for the selected website based upon the metric health scores calculated for the plurality of metrics.