The surface of window glass is usually smooth, but the adhesion of adhesive tape is not strong enough. The adhesive tape needs a rough surface to provide enough friction to keep adhesion, but the glass surface is too smooth to provide this friction.
Temperature will also affect the adhesive ability of adhesive tape. At low temperature, the viscosity of the adhesive tape will weaken and it cannot be effectively adhered to the glass. At high temperature, the adhesive tape may become soft and fall off easily. Therefore, using adhesive tape at extreme temperatures may be ineffective.
There is often dirt such as water vapor or dust on the windows. These dirt will adhere to the glass surface, preventing the contact between the tape and the glass. Even if it is successfully pasted for a period of time, these dirt may cause the tape to fall off.
There is also a chemical reaction between the tape and the glass. Especially in long-term contact, the chemicals in the adhesive tape may react with the glass surface, resulting in the adhesive tape not sticking firmly.
The failure to attach adhesive tape to the window is caused by many factors, such as the smoothness of the window surface, temperature, dirt, chemical reaction and so on. If you need to stick something on the window, you can consider using other methods, such as suction cups or hooks to fix things.