I'd like to offer up some experience looking for and analyzing generic water leaks inside passenger cars. Where does the water come from?
--Air Conditioning (A/C) Condensate. As the finleyarcher answer to this posting tells you, the Heating, Ventilation, Air Conditioning system (HVAC) is one possible point of water entry. When you are running your car's air conditioner in high humidity hot weather, there is a whole lot of water vapor in the air. That vapor condenses on the surface of the cold evaporator core, and exits a drain. The drain is generally on the engine side of the dash panel directly in front of the passenger. You'd be surprised how much water comes out. In optimal conditions, it wouldn't surprise me to see one cup (8 fluid ounces) in five minutes of operation. If the drain is clogged that water will go somewhere else. That would be bad. What I don't understand from you is... its February and I'm assuming this car is in the United States. Not really hot humid weather. Perhaps there is another source of trouble? Or are we seeing evidence of water from six months ago? (hint: it would be nice to know your location!)
--The other source of water is from adverse weather... rain! There are a whole lot of entry points. Key points where I've seen troubles.
-- Water overflow at the rain hat. When it rains, a lot of water goes into the passenger compartment air inlet area at the base of the windshield. Air goes in, then travels across the top of the cowl and enters the passenger compartment directly in front of the passenger. There is a water separator system there. There will be a metal or plastic flange that stops water from entering the car. We always called that part the rain hat. Here are a couple of photos. That part is put on the car when the sheet metal is welded up. Its tightly sealed to preclude leakage. The rain hat stops water, so long as the rest of the cowl area drains. I've seen cars where the cowl drain got stopped up with leaves, water filled up and went over the top of the rain hat. When it does that, the water drips on the floor right in front of the front seat passenger. (if you told me you park your car under a tree that drops leaves and seeds a lot, this is where I would start my troubleshooting...) (Do you park your car routinely in such a place?)
--Water from the front tires. When you are driving in the rain, there is a whole lot of water thrown off the tires. And that water getting thrown off doesn't go straight down. Check your inner fenders carefully. Is there any path for water to enter the passenger compartment?
--Sun roof drains. You didn't tell us if the car has a sun roof or not. These things can easily leak. Most manufacturers who install a factory sunroof add FOUR drain hoses, one at each corner. The hoses run down the sheet metal pillars to drain water out of the bottom of the car. If those hoses aren't attached well, you'll see water inside the passenger compartment. (Does this car have a sun roof?)
--Sheet metal junctions. There is an area at the top of the windshield, inboard about two inches from the side of the car where a bunch of sheet metal joins together. Its certainly a location that can generate a slight leak. Usually you will see a slight water spot on the headliner when this happens.
--Door seals, leaking water. Doubtful. Not likely. The door seals primary purpose is to manage air leaks and reduce noise (so its quiet in your car!)
Info offered here to share a bit of experience troubleshooting water leaks inside vehicles...
Good luck with your troubleshooting and repair.