These data can be used for knowing the optimal hour for the extraction of matter (wood chips) inside the greenhouse dryer or keeping the matter from open sun drying As the levels of temperature and relative humidity are the two main environmental factors that influence the drying time, it is demonstrated that the environmental conditions generated inside the solar greenhouse dryer are more favourable for a wood chip drying in less time and also suitable for reaching a final moisture content less than what can be achieved in drying outdoors for the same place and time of