My professor gives the solution, as we can see at the site were the climatic variables came from http://www.worldclim.org/formats1:
"Please note that the temperature data are in °C * 10. This means that a value of 231 represents 23.1 °C. This does lead to some confusion, but it allows for much reduced file sizes which is important as for many downloading large files remains difficult. The unit used for the precipitation data is mm (millimeter)."
thanks anyway!!!