A great idea, and offered in our General Store for nearly 20 years. Find the exact outside temp from the inside comfort of your kitchen. The Outdoor Easy to Read Windowpane Thermometer by KleerTemp. Simple, and brilliant! It clings electrostatically to the outside of a window. Its big readable numbers are in full view through the glass. Pulls off easily for window cleaning. No tools or screws needed for installation. Re-positions in seconds to a new window. No batteries or power needed. 7.25'' Diameter. Fits nearly all windows. Displays temp in both Fahrenheit and Centigrade scales. One year warranty.