A 3-m deep temperature probe was installed at the campus of Indian Institute of Management, Ahmedabad in August, 1999. Probe has five resistance type device PT 100 sensors, mounted at 1-m interval. It was put in to the ground up to depth of 3-m. First sensor is at 3-m depth, second at 2-m depth, third at 1-m depth, fourth just 2 cm below the surface and the fifth 1-m above ground. Temperatures from all the sensors were noted one day on each month for a year. Readings were noted at hourly interval. In this paper, the results are presented. Motivation for this work was the need to know the diurnal and seasonal variation of temperature in deeper layers of soil in order to determine the level suitable for installation of earth tube heat exchangers.