The following are performance metrics that can be calculated using RCMES. The code that supports these computations is developed at the Apache Open Climate Workbench.
| Metric Name | Function Name | Input Format | Output Format |
| Bias | Bias | 3-D lat/lon | 2-D lat/lon |
| Standard Deviation Ratio | StdDevRatio | 3-D lat/lon | 2-D lat/lon |
| Pattern Correlation | PatternCorrelation | 2-D lat/lon | 1-D Scalar |
| Root Mean Squared Error | RMSError | 2-D lat/lon | 1-D Scalar |
| Spatial Mean of Bias | SpatialMeanOfTemporalMeanBias | 3-D lat/lon | 1-D Scalar |