Winters' additive method uses the three components of the smoothed value, level, trend, and seasonal to generate forecasts. The data up to the origin of forecasts are used to determine the smoothed values.

For the water usage data, the forecasts (the predicted water usage charges in the school district) for the next 3 billing periods are displayed next to the corresponding time units of the forecast. For example, for the next period, you should expect a water usage charge of $313.615.