Research carried out at a 15th-century wooden church in Dębno Podhalańskie was aimed to identify the threats that may be posed to the building by the variation in its inner microclimate which is influenced by the outer climatic conditions. During three years, temperature and relative air humidity were measured inside and outside of the church. This provided the basis for establishing the periods that are particularly unfavourable for the building and its interior, and assessing the effect that tourists and people attending worships have on the inner microclimate of the church. Some preventive measures were suggested in the form of practical recommendations. The measurements were performed using electronic temperature and humidity sensors. It was found that the inner microclimate depends very much on the outer weather conditions. Strong and long-lasting changes that occur in air humidity inside the church adversely affect its polychromy. High humidity is conducive to the growth of wood-invading fungi, bacteria and mould.

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