You can try with the information on this page and make it yourself. Free software from FAO can also help you. New_LocClim, has a worldwide database used for agricultural projects.
I am sending you a model made with the Shepards method, which is specially designed for climate interpolation, about the standard deviation.
I am sending you a model made with the Shepards method, which is specially designed for climate interpolation. About the standard deviation. I do not know the restrictions of the place, but it can be a good beginning to develop the climatological model.