Change temperature unit on Total Launcher

I'm using Total Launcher, from the makers of ssLauncher. It has a weather widget that uses [OpenWeatherMap](http://openweathermap.org) . The default string is %4.1f° and the widget shows Celsius. I tried every letter in the alphabet in place of the f but most of them said invalid format and none of them gave an expected value. Is it possible to change the unit to Fahrenheit?