No, viruses cause colds, not cold weather, or wet hair, or any other old wive's tale. We tend to get colds in the winter because we are cooped up inside with recirculating air. Also, humidity levels are lower in the winter which causes your nostrils to dry out and be more susceptable to infection. Wash your hands, get plenty of fresh air, and use a humidifier to prevent colds.
Deb