Long click a free spot on your home screen to add it.
Click widget for preferences and problem reporting.
Having problems? Click the widget, go to the Logs tab, then click the "Report Problem" button. Or send an e-mail to firstname.lastname@example.org
Weather data graciously provided by http://OpenWeatherMap.org , thanks guys!
Updates every 30 minutes, or when you activate Wifi / cell data. Your local weather station may update less often than that, call them not me if measurements are old.
Source code can be browsed here: http://bazaar.launchpad.net/~walles/thermometer/trunk/files
The widget uses the Google Play Services Location APIs to work around Android bug 57707: https://code.google.com/p/android/issues/detail?id=57707
The widget does not track your position.