This article focuses on studying and analyzing rainfall
variability in the Sahel area with a case study from Sudan. The
main objective of the article is to analysis the rainfall variation
over both space and time during the last four decades. The data
for rainfall variability was collected from five meteorological
stations namely, Elobied, EnNuhud, Elfashir, Nyala, and
Elginaina for the period 1970-2010 including four strong Elnino
events. The descriptive and statistical analytical methods, the
mean, standard deviation, coefficient of variation and
Geographical Information System (GIS) have been used for
data analysis. The results show that rainfall is highly fluctuated
and varied over both space and time indicating a real variation in
annual average rainfall values. the coefficient of variation ranges
between 0.22 to 0.37 and the standard deviation ranges between
76 to 127.6 which are presented in GIS formats. Results also
show a successive decade of small rainfall variatbility followed
by a decade of high rainfall variability. Two positive and four
negative anomalies have been found during the period 1970-
2010.