20th Century	Period of Record	Current Decade
All Divisions	Chart	Chart	Chart Comparisons
Division 1	Chart	Chart	Chart
Division 2	Chart	Chart	Chart
Division 3	Chart	Chart	Chart
Division 4	Chart	Chart	Chart
Division 5	Chart	Chart	Chart
Division 6	Chart	Chart	Chart
Division 7	Chart	Chart	Chart
Division 8	Chart	Chart	Chart
Division 9	Chart	Chart	Chart
Class Return Frequency Exceptionally Wet 50 years Extremely Wet 25 years Very Wet 12-13 years Wet 6-7 years (upper dotted line) 3 years (lower dotted line) 3 years Drought 6-7 years Severe Drought 12-13 years Extreme Drought 25 years Exceptional Drought 50 years