house with lit Christmas lights while it's snowing
Photo: Tadashi Osumi/Getty Images
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Snow and Rain

Moisture and electricity don't mix. A ground-fault circuit interrupter (GFCI) prevents shorts—and shocks—and most city regulations require their use with outdoor lighting; portable units cost under $30. Cover the male and female ends of light strands with electrical tape or encase them in plastic freezer bags to help keep water out.
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