Moving air flowing over your skin feels colder than still air. The temperature of the air is in fact the same. That "cold" sensation on your skin comes from the evaporation of the moisture on your skin caused by moving air. That is why sitting in the airflow of a fan feels good on a hot summer day. The air from that fan has the same temperature as the other surrounding air. Again, the air movement over your skin causes the chilly sensation. That is why drafts are so uncomfortable.