Poinsettias are native to Mexico and Central America, and are therefore not very tolerant of the cold. If you want to place one outside, it's advisable to only do so in the summer months, and if you live in the USDA hardiness zones 9-11. It may be possible to place it on an outdoors dining table as a decoration for a short period of time in winter, but make sure to bring it indoors for the majority of the time.