Temperature and pressure monitoring in Postojnska jama is compared to outside conditions. Air pressure in the cave at three monitoring sites fluctuates synchronically with outside air pressure. Temperature data for Postojna 1 and 3 show good correlation with outside climate conditions for the period 2009–2010. The temperature at Postojna 1 was increasing constantly from March to May 2009, while at Postojna 2, it was decreasing. Postojna 1 has a seasonal trend in accordance with outer trend, while seasonal trend at Postojna 2 is just contrary to outside trend. Microclimate studies at Postojna 2 show local variability, especially in winter, and exhibit special microclimate conditions that may be due to ventilation of unknown passages in the back.
The paper presents and discusses results of temperature monitoring at five different locations in Postojnska jama and two locations in Predjama. Temperatures at different locations exhibit different dynamics, depending on their position related to natural ventilation of cave.
MEIS participated in the N4C European Research Project of 7OP, which achieved excellent reviews. In cooperation with partners, MEIS developed DTN Internet Technology for gathering environmental measuring data. Because the nature of DTN technology allows its implementation for the purpose of gathering measurement data in Karst caves, MEIS upgraded its technology to be implemented in the Postojna Cave in one of the meteorological measuring stations located along the tourist train route. This is the first instance of DTN technology used for such purposes in the world. This conference contribution which was the result of this project, as well as the N4C project, features a detailed description of the DTN Technology software and the testing environment following the same methodology as the station in the cave.