The next step is to define the seasons that you want associated with your Seasonal Metric

name. For example, in the case of a Quarterly Mean, you would want to define four seasons.

To start this process, click on the Add button below the Seasons box. Then, in the far right side

of the window under Selected Season Details, give the Start Date and End Date for each


Next, you need to choose the Statistic tab or the Custom tab to determine how the daily

Metrics will be combined in each season. For example, you might choose the Mean from the

drop-down list on the Statistics tab. This would calculate the mean of the daily metrics in each

season. The Custom tab allows seasonal metric values to be calculated using customized

functions, similar to those used to calculate daily metric values from hourly observations. See the

Function Editor appendix for more detail on this topic.

Once you have finished defining the Seasonal Metrics, click OK to return to the Pollutant

Definition window.




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