Abstract. Climatic changes observed in the last few decades have an adverse effect on microclimatic conditions within premises of libraries, art gallery repositories and museum storages, as well as in archive repositories within governmental and public institutional buildings. The registered outdoor air temperature increase leads to raising of premises indoor air temperature, too. More and more frequently internal air temperature overreaches the appropriate values for safe and sustainable safekeeping of archive collections. Because of that maintaining of suitable and stable air temperature and humidity conditions are of crucial importance for long lasting and correctly archive units storing within storage rooms. In contrast, any disturbance of stability at microclimatic conditions within premises leads to more rapid structural deterioration of stored archive units. Based on an experiment carried out in the premise of meteorological archive of the National Institute of Meteorology and Hydrology (NIMH) the temperature and humidity conditions during the warm half-year (19.05-30.11.2003) were investigated. Peculiarities in the diurnal course (of hourly values) and monthly course (of the average diurnal values) of air temperature, relative humidity, moisture content and enthalpy in the NIMH archive repository on the background of those of the environment were investigated. Dependencies between average diurnal values of the outside air parameters and those inside the NIMH building (air temperature, relative humidity, air moisture content and enthalpy within the premise) were obtained as well.

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