What precautions should I take when biking in 40-degree weather to ensure my safety and comfort?

When biking in 40-degree weather, it is important to wear layers of clothing to stay warm and dry. Make sure to wear a windproof and waterproof outer layer, gloves, and a hat to protect your extremities. Also, ensure your bike is equipped with proper lights and reflectors for visibility. Stay hydrated and take breaks to warm up if needed.