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If your lights are shorting out during rain storms or other winter events, you should probably replace them. These shorts indicate electrical issues that could cause serious hazards. Look for outdoor-rated lights with connectors made for rainy conditions to replace them. But if your Christmas lights are new and you want further protection, you can find weatherproof covers to add to the male-end connectors of your Christmas light strings. These can minimize the risk of shorts.

Between seasons, inspect cords for damage, replace burnt-out bulbs, and clean lighting fixtures to prevent dirt buildup. Proper storage in cool, dry conditions will extend the lights' lifespan and minimize repairs or replacements when redeployed.

Cold weather can cause older incandescent Christmas lights to fail by causing cracks in the finish or the glass itself. Modern LED lights are affected in the opposite way and perform even better as the temperature drops. 

You can take a few steps to prolong the life of your holiday lights. Make sure to replace burnt-out bulbs as quickly as possible to avoid overloading the rest of the circuit and knocking out more lights. Before packing them up each year, plug each strand into the wall to confirm everything is still working. Wrap the lights carefully back into their original packaging or something similar—winding a strand tightly together or leaving it to hang loose in a storage bin can lead to frayed or damaged wiring.