Winshield moisture

[candy_jai]

After leaving my Yaris sitting under the snow for about a week, I noticed that the windshield was wet on the inside. It seems that moisture has been getting in. I know all the windows were shut. Should I bring it in to check for leaks or is it because the vent is left in the fresh air position and letting moisture in? It doesn't do that when I leave it out when it's raining.