Formula for the calculation of ground temperature at 1 m depth in Turkey

The formula has been found by using the yearly averages of the temperatures at 1 m depth measured in 193 meteorological stations distributed all over Turkey. It has thus become possible to determine the regional temperature value at 1 m depth at any point in Turkey, if the latitude, longitude and elevation are known. The values, calculated by the formula, can contribute to geothermal exploration in Turkey by providing values that can be compared with the observed ones, and, by becoming second values for the calculation of geothermal gradients where only single downhole temperatures are available. The formula has been evolved by expressing the temperatures as the linear function of latitude, longitude and elevation.