The largest scales of the zonally averaged temperature, albedo, infrared flux, and solar flux are represented by a few terms in a Fourier-Legendre expansion in latitude and a Fourier series in time. Prior to fitting, the data were symmetrized so that only data from the Northern Hemisphere were used. A simple energy balance climate model is constructed with diffusive heat transport and an albedo value jump on a snow line which follows a specific isotherm. In order to achieve the proper seasonal temperature field, it is necessary to consider the land and ocean covered areas separately. It is suggested that such models might be useful in the study of sensitivity of the temperature field to changes in various climate forming parameters.