No seasons, all parts of Earth would get equal amounts of heating according to their latitudes. Only slight variations in heating due to how close the Earth is to the Sun in its orbit, i.e. aphelion vs. perihelion. There would be no massive ice build-ups, except at altitude on mountaintops. There would still be winds around the planet, though heat flow would be always from the equator to the poles, rather than from the tropics to the poles. Oh, there wouldn't be any discernible tropical or polar circles either, so no Tropic of Cancer/Capricorn or Arctic/Antarctic Circles. Ocean currents would be more or less the same, as they follow the continental coastlines mostly, though there might be less variation in flow rates seasonally.