That depends on the fixture.
Some of our fixtures are wet rated, and suitable for use outdoors. Wet rated fixtures can withstand direct exposure to the elements. Those fixtures can be found here.
Many others are “damp rated” for use in covered locations as long as they are protected from rain and snow. Lights that are damp-rated say “Suitable for Damp Locations” on their product page under Product Details.
Please note, fixture finishes may experience expedited wear if in coastal climates.