Yes, you need an outdoor-rated extension cord for Christmas lights. These cords are weatherproof and designed to handle moisture and temperature changes, ensuring safety in outdoor conditions.

3 prong extension cord 100 foot outdoor is IP65 waterproof, weather-resistant, heat-resistant (100°C), corrosion-resistant, flexible vinyl power cord extension 100 feet will keep flexible at -40 ...

HUANCHAIN 100 FT 16 Gauge outdoor extension cord: was $33 now $27 @ Amazon This ... That's in addition to reinforced insulation and weatherproof connectors that help them withstand exposure ...