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.