The Percent consistent (PC) skill map shows the accuracy of the forecasts, measured using historical data. It is the percentage of times the forecast system could correctly forecast a drier or wetter than usual year, if it had been used to forecast the years in the base climatology.

If the PC is less than 50% (shown in white), then the forecast is not useful. If the PC is greater than 65% (shown in red), then the forecast can correctly predict a wetter or drier season in at least two out of every three years. In general, 3-month outlooks are more skillful than forecasts for individual months.

More detailed skill information and additional skill scores are also available by clicking on the "Skill" tab.