El Niño affects the
weather in large parts of the world. The effects depend
strongly on the location and the season. We have studied the
GPCC V7 analyses of precipitation over land. White areas did
not have enough data. As a measure of the strength of the
relationship we used the correlation coefficient with the
Niño3.4 index. The square of this number gives the
fraction of the variance that is explained by this aspect
of El Niño.
Precipitation
Blue colours indicate that during El Niño there was, on
average, more rain than normal, red colours indicate drought during El
Niño. La Niña has the opposite effect in almost all
locations.