The Ohio state lies between 38 27', and 41 57' north latitude; it is bounded by the meridians reading 80 34' and 84 49'. For its width in latitude and its lack of great range in altitude, it has a marked range in mean annual temperature; in southern Ohio the mean annual range is 54 , while in northern Ohio it is 49 ; its range in average temperature is about 40 . Lake Erie exerts an appreciable influence on climatic conditions for the northern part of the state.