Could leaving the window open during the winter make someone sick?

Cold weather . So, cold weather does not cause illness, but the cold raises the chances of getting a virus . Viruses spread more likely during the cold weather. .
No it can not. Dating back many years has been the myth of catching a chill. Most infections are viral or bacterial and can be spread by touching/contact or by airborne routes. Exposure to air from an open window will not make you ill.