SEASONALITY OF RAINFALL IN SOUTH-WESTERN NIGERIA
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Date
2019
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Published by Department of Geography, Ahmadu Bello University, Zaria, Nigeria.
Abstract
Climate change seems to be the foremost global challenge facing humans at the moment. One of
the challenges posed by change in climate is ascertainment, identification and quantification of
rainfall and its implications on human activities. This study aimed at analyzing the effect of
climate change on rainfall seasonality in south-western Nigeria. Data used for the study was
monthly rainfall records of Lagos, Oyo, Ogun, Osun, Ondo and Ekiti state for the period 1983-
2017 which was gotten from NIMET office at Oshodi. Walsh and Lawler (1981) method was
adopted to calculate seasonality index while time domain Time Series Analysis and t-test were
used to analyze the data of the study. The results of the study revealed that Lagos, Oyo, Osun
and Ondo states experienced shortened spread of rainfall during the period of study while Osun
and Ekiti experienced increase in spread of rainfall. In general, south-western Nigeria
experienced a shortened spread of rainfall with rainfall occurring between 7-9months of the year
during the period of study. Furthermore, t-test result showed that there is a significant difference
in seasonality of rainfall in the region during the study period. It was concluded that the region
experienced shortened spread of rainfall during the period of study. It was therefore
recommended that during the periods of excess rainfall, water should be stored by government in
dams while farmers and residents should store water in artificial reservoirs to cater for the
shortage during the period of deficit
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Climate, Rainfall, Seasonality, South-western, Time series.