Vapor production will be higher in cold weather this is because the warm vapor hitting the cold air cause it to expand. Here is a little test for you to do go to the refrigerator take a hit blow it out, now open the refrigerator and blow towards it, and lastly open the freezer and do the same, you will see each step causes more vapor to appear. I did some freezer
vaping in a big walk in unit last week just for the fun of it. Was blowing some seriously massive clouds.