The answer to 'why is my window moldy' is that mold growth on windows is a common problem caused by excess moisture and lack of proper ventilation. Mold thrives in damp environments and can appear as discolored spots or fuzzy growth on window frames, sills, and glass.
Some of the most common causes of window mold include high indoor humidity, poor air circulation, leaks or condensation, and inadequate cleaning. Mold can pose health risks and should be addressed promptly. In many cases, you can treat minor mold growth yourself, but for more extensive or recurring issues, it's best to call in a professional mold remediation specialist.