This thesis investigates the effect of temperature on the performance of crystalline silicon solar cell at Debre Markos. The study considers the performance of solar cells in the temperature range 281.97K–299.33 K and annual average temperature range 296.675K-283.95K. Based on this, the relation between temperature and electrical performance parameters including energy band gap, short circuit current, open circuit voltage, fill factor, and efficiency were studied. The effect of temperature on these temperature dependence performance parameters is studied by using the existing mathematical modeling equations and metrological data. Here, the temperature data used in this study was also gathered from the meteorology site of Debre Markos and the study considered the monthly average maximum and minimum and annually average minimum and maximum temperature values from the year 2017-2021. By using the data and utilizing the modeling, the graphs of these performance parameters and temperature have been sketched by using the existing software called “Origin”. The rate of change of performance parameters with temperature, dJsc/dT, dEg/dT, dVoc/dT, dFF/dT and dղ/dT are calculated and compared with the available data in the literature. The study shows that the performance of solar cell decreases as the temperature increases, and more importantly the rate of decrees are expressed numerically at Debre Markos for the first time. The study showed that saturation current increases as temperature increases with an average rate of 1.37x10 -12 mA/cm -2 /K. The energy gap of solar cell decreases as temperature increases, and monthly average energy gap is 1.11327eV from the year 2017-2021 in the selected site. Open circuit voltage and fill factor of the cell tends to decline as the temperature increase at a rate of 1.56mV/K and 0.060%/K, respectively. Apparently, the efficiency of the cell decreases as the temperature increases, and average minimum and average maximum efficiency of the crystalline silicon solar cell, in the city for the selected city, is respectively 27.11% and 28.46% while the annually average efficiency of the cell remains to be 27.78%. The highest device efficiency is observed in January. The trend of the device efficiency tends to have similarity to the fill factor, open circuit voltage, energy band gap as well as the temperature. The study has practical implication in relation to installation and efficient utilization of solar cell at Debre Markos. It studies the potential and related efficient utilization of solar cells at Debre Markos.