It may seem obvious that outdoor furniture should stand up to the weather. After all, you don’t want the hard job of carrying it out and back in every time it is to be used. And unless it can stay outside all the time, you will end up not wanting to use it at all because the job is so onerous. If the furniture is to be located on a grassy area it is even more important that it is weatherproof.
When something heavy is left on grass it will sink in and reach the soil underneath, which is often quite damp. This will rot the legs of most timber furniture, because even if it is painted, that constant wear on the base of the legs will soon penetrate the paint and the moisture will seep up into the inside of the wood. The end result will be the paint is compromised and the timber will rot from the ground up.