Determining rainy season onset and retreat over Nigeria from precipitation amount and number of rainy days |
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Authors: | T O Odekunle |
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Institution: | (1) Department of Geography, Obafemi Awolowo University, Ile-Ife, Nigeria |
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Abstract: | Summary This study assesses the relative efficiency of the use of rainfall amount and rainy days in the determination of rainfall
onset and retreat dates in Nigeria based on rainfall data for the period 1961 to 2000. Daily rainfall data were sourced from
the archives of the Nigerian Meteorological Services, Oshodi Lagos. The specific locations for which data were collected are:
Ibadan, Ilorin, Kaduna and Kano. The method of percentage cumulative mean rainfall values was employed in the determination
of the rainfall onset and retreat dates.
The results obtained show that both rainfall amount and rainy days are equally effective in the determination of the mean
rainfall onset and retreat dates in Nigeria. With regards to the rainfall onset and retreat dates of the individual years
however, the method based on the rainy days is more effective than that based on rainfall amount, as the former yielded more
realistic dates than the latter. It is thus recommended that studies investigating rainfall onset and retreat dates within
a series of individual years in Nigeria, should be based on rainy days rather than rainfall amount. |
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