Table 1.
Climatic conditions of West Africa.
| Data Monitoring Station | Geographical location | Country | Ecological zone | Mean annual rainfall (mm) | Mean annual evapotran-spiration (mm) | Mean annual temp. (0C) | Period of climate records | |
|---|---|---|---|---|---|---|---|---|
| Lat. | Lon. | |||||||
| Niamey | 130 48′N | 20 16′ W | Niger | Sahel savannah | 560 | 2000 | 36.0 | 1905-1989 |
| Koro | 120 46′N | 70 49′ W | Mali | Sahel savannah | 522 | 2041 | 36.8 | 1971-1990 |
| Bobo Dioulasso | 110 16′N | 40 31′ W | Burkina Faso | Sudan savannah | 759 | 1958 | 31.5 | 1971-2000 |
| Tamale | 9025′N | 0050′W | Ghana | Guinea savannah | 1087 | 1650 | 28.2 | 1961-2000 |
| Axim | 50 09′N | 20 57′ W | Ghana | Forest | 2148 | 1315 | 25.8 | 1961-2000 |
Sources: Modified after [14]; http://www.climate-zone.com/.
Note: The study area is highlighted.