Turn you windows desktop into a charmeleon. Charmeleon is what we want to call it. But, it is known as AERO WEATHER.
This is what addictive tips say "AeroWeather is an interesting application which looks for temperature or weather condition of your city and change the Windows Aero theme color according to it. The application sits silently in the system tray, retrieving the temperature in real-time. Overall, it makes an appealing connection with the temperature of your location with Windows Interface to give the real-life experience of knowing the weather conditions. With AeroWeather up and running, you can just look at the Windows current color scheme to know the temperature of your current location.