Tropical Meteorology Real-Time Forecast Accuracy (Average Error based on Real-Time Forecasts)

The years where a particular forecast were issued are in parentheses

December Forecast

Named Storms: ± 4.4 (1992-2010)
Named Storm Days: ± 31.5 (1992-2010)
Hurricanes: ± 3.1 (1992-2010)
Hurricane Days: ± 14.9 (1992-2010)
Major Hurricanes: ± 1.7 (1992-2010)
Major Hurricane Days: ± 5.4 (1992-2010)
Net Tropical Cyclone Activity: ± 64.2 (1992-2010)

April Forecast

Named Storms: ± 4.1 (1995-2010)
Named Storm Days: ± 28.8 (1995-2010)
Hurricanes: ± 2.9 (1995-2010)
Hurricane Days: ± 14.6 (1995-2010)
Major Hurricanes: ± 1.8 (1995-2010)
Major Hurricane Days: ± 5.3 (1995-2010)
Net Tropical Cyclone Activity: ± 61.5 (1995-2010)

June Forecast

Named Storms: ± 2.8 (1984-2010)
Named Storm Days: ± 19.4 (1984-2010)
Hurricanes: ± 2.0 (1984-2010)
Hurricane Days: ± 11.3 (1984-2010)
Major Hurricanes: ± 1.4 (1990-2010)
Major Hurricane Days: ± 4.3 (1991-2010)
Net Tropical Cyclone Activity: ± 46.2 (1991-2010)

August Forecast (Only Includes Storms Forming after 31 July)

Named Storms: ± 2.3 (1984-2010)
Named Storm Days: ± 16.1 (1984-2010)
Hurricanes: ± 1.7 (1984-2010)
Hurricane Days: ± 9.6 (1984-2010)
Major Hurricanes: ± 1.0 (1990-2010)
Major Hurricane Days: ± 3.9 (1990-2010)
Net Tropical Cyclone Activity: ± 35.8 (1990-2010)