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The analysis of the climate variables behavior inside of low tunnels and a comparative study of different areas of perforated covering plastics could be a good way to find the best climated to develop vegetables in forced cultivation (Pereira et al. 2001). The use of perforated plastic as a covering material would minimize the lateral curhain managment to provide natural ventilation for the plants during their development. Its important to avoid hight temperatures and relative humidities that happened caused by the small air volume inside the tunnel. The purpose of this research was to determine the environmental changes that the low density polyethylene with different perforated film areas (5,10,15 and 20%) may cause on the radish (Raphanus sativus L.) development in low tunnel conditions. The climate data inside the tunnel was collected from 8:00 AM to 6:00 PM during winter time. The climate variables analyzed were the relative humidity, air temperature and solar radiation and the plants variable analyzed was the final production. The results didnt show significative differences among the perforated film areas analyzing the environmental characteristics, but showed differences in the final production of the culture.