Table 2.
Frequency and location of Atlantic cyclone activity, 1851–2006
| Period | No. of cyclones | No. of cyclones active south of 10°N* | Southern maximum |
|---|---|---|---|
| 1851–1860 | 60 | 0 | 12·0°N |
| 1861–1870 | 76 | 1 | 9·5°N |
| 1871–1880 | 75 | 1 | 8·5°N |
| 1881–1890 | 82 | 1 | 9·9°N |
| 1891–1900 | 84 | 2 | 8·7°N |
| 1901–1910 | 79 | 3 | 7·7°N |
| 1911–1920 | 54 | 0 | 10·3°N |
| 1921–1930 | 56 | 1 | 9·5°N |
| 1931–1940 | 104 | 1 | 8·8°N |
| 1941–1950 | 98 | 0 | 10·2°N |
| 1951–1960 | 98 | 0 | 10·1°N |
| 1961–1970 | 98 | 3 | 8·0°N |
| 1971–1980 | 96 | 0 | 10·0°N |
| 1981–1990 | 96 | 6 | 7·2°N |
| 1991–2000 | 111 | 6 | 8·3°N |
| 2001–2006 | 96 | 4 | 8·9°N |
Data adapted from NOAA (2007).
* In all but one case, cyclones active south of 10°N also tracked north of that line. The only recorded cyclone occurring entirely south of 10°N, in the south Atlantic, occurred in 2004 (Pezza and Simmonds, 2005).