**3. Materials and methods**

#### **3.1 Data collection**

Sixty years (1961–2020) of rainfall data and forty years (1981–2020) of temperature from nine (9) stations were analysed. These data are secondary and from the archives of NiMet, Abuja, and NASA Data Access Viewer. The criteria used in choosing the stations are; a long period of available rainfall and temperature data; those stations without large missing data for the time under study; those stations that have not been moved since they were established and also the data were subjected to normality distribution test (**Table 1**).

