FIGURE 2. Composites of austral summer precipitation for central and southern Africa as a function of the standardized malaria annual incidence for Botswana.
From the following article:
Malaria early warnings based on seasonal climate forecasts from multi-model ensembles
M. C. Thomson, F. J. Doblas-Reyes, S. J. Mason, R. Hagedorn, S. J. Connor, T. Phindela, A. P. Morse and T. N. Palmer
Nature 439, 576-579 (2 February 2006)
doi:10.1038/nature04503

Mean precipitation anomalies for the five years with the highest (a, c) and lowest (b, d) malaria annual incidence in Botswana for November–February CMAP (a, b) and DEMETER (c, d) ensemble-mean precipitation. A different colour scale was used for the observed (CMAP) and re-forecast (DEMETER) precipitation because of the unavoidable reduction in amplitude of the predicted anomalies when averaging the 27 ensemble members.
