I can't figure it out. In the summer time, we don't experience this problem. But in all other seasons, all glasses (all four windows, front windshield, rear windshield) are so very wet. They are so wet, that when a paper towel touches, the towel is almost immediately dripping wet.

When winter time comes around, I'll have to do the scraping not just on the outside, but also on the inside!

I tried to elimanate possibilities.
No water bottle has spilled.
On a dry day, I take a hose and drench the outside with water, and there doesn't appear to be any water entering the car.
The front windshield has some hairline cracks, but it doesn't seem that moisture can enter that way.

How can I figure out what the problem is?

 

Check for water under the carpet and in the trunk / spare tire compartment. Trunk leaks are real common.

In non-freezing weather, running the A/C and the heat at the same time everywhere you go will help de-humidify the interior.

 

Hi, mk378. Thank you for your reply. Once, more than a year ago, my water bottle did spill out in the trunk. I've since gotten all the water out.

When you said check under the carpet, do you mean the removable mats (with rubber belly)?

 

if your tracking mud and water into your car via the floor mats during the day then you park in a nice warm garage or even if it gets warmer outside condensation will form. and mk means under the actual carpet not the mats if theres a leak in the windshield you most likely wouldn't see it it would puddle under the carpet. does your car smell moldy or like mildew in the summer ???

 

hitburns,
No, I didn't smell mold or mildew in the summer.

I talked to someone. He said it could be that the rubber seals by the windows/windshields are not working well anymore.