When visiting Chengdu in December, you should prepare for a chilly, damp, and often overcast early winter climate where temperatures typically range from 3°C to 11°C (37°F–52°F). The most effective strategy is layering, starting with a non-negotiable base of thermal underwear or long johns to combat the bone-deep humidity. For mid-layers, pack wool sweaters, fleece jackets, or fleece-lined hoodies, while your outer layer should consist of a windproof and waterproof heavy coat, down jacket, or padded overcoat. Since the city lacks central heating, indoor spaces can feel quite cold, so cozy items like thick wool socks and thermal leggings are highly recommended. Essential accessories to protect against biting winds include a warm hat, gloves, and a scarf, along with comfortable, waterproof closed-toe shoes or boots for navigating damp streets. Additionally, because the city's topography can trap haze and humidity, bringing a mask for air quality and a compact umbrella for occasional light drizzle is advisable.