In this study, the Angstrom-Prescott regression equation which has been used to estimate the monthly average daily solar radiation on a horizontal surface was used. The values of the regression coefficients a and b as 0.34 and 0.42 were determine. The statistical error estimations such as RMSE and MBE used to test the correlation between the measured global solar radiation and the calculated global solar radiation. The RMSE was found to be 0.05 as low as expected and the MBE was also found to be 0.015. Global radiations obtained in this study are higher with mean value of 23.60 MJm-2 and the measured value 23.48 MJm-2 which shows the presence of high global solar energy potential in Maiduguri, Nigeria. The global solar radiation intensity predicted in this study can also be utilized in design, analysis and performance estimation of solar energy systems, which is gaining significant attention in Nigeria and the world at large.