Climatic factors play an important role in effectiveness of the electricity production of photovoltaic systems. Climatic factors can influence the functioning of photovoltaic systems on local and micro climatic scale. Local climate refers to processes occur in the atmospheric urban boundary layer (UBL). Air pollution processes lead to a significant increase in the concentrations of atmospheric aerosol what causes increasing optical depth within the UBL. It can result in a decrease of solar irradiation by up to 20%. Microclimate scale factors work within the closest environment of the solar panel systems. First to mention is sky view factor (SVF) what represents the ratio between the visible sky and a hemisphere centered over a point on the surface of the Earth. Surface objects, trees, buildings etc. can reduce SVF significantly in the environment of solar panels resulting in lower electricity production. Other micro scale climatic effect is the thermodynamic behavior (warming up) of the closest environment of the solar panels what can cause great differences in the performance of PV systems. In the case of the worst combinations of technical parameters and climatic factors the performance of solar panel systems can decrease by 30-40% elongating the payback time of the investments. Relationships between the electricity production and climatic conditions on local and micro scale in the case of photovoltaic systems working in different urban environments are traced in the present paper.