I'm not sure if a widget actually does anything, if it's not on the homescreen. I have a feeling that widgets are completely inactive until you place them on the homescreen, but maybe someone else with more experience and knowledge will chime in here! I have looked at the usage of the weather widget, using app opps...and it shows no usage ever since the install of KitKat on my phone a few weeks ago. I am guessing it's due to the fact that it's not on my homescreen...and I was thinking that the behavior of all widgets would be the same as this...but, that's simply an educated guess.