There was water on the kitchen window facing north, which led to a lot of water on the balcony as we

Is it the water dripping from the air conditioner upstairs, if it is water vapor, it will not be such a big bus, and the general water vapor is indoors, not too much outdoors, you can check whether it is the water dripping from the air conditioning pipe upstairs.

That's because your kitchen window is not well chosen, and when there is water in winter, it is the north wind blowing in winter, so there is water.

The room is hotter than the outside, and the water vapor in the air in the room will cool down when it floats to the window, and liquefied into water droplets.