Several people have requested before to be able to display the top users in a given month, week, or other period of time. We are pleased to announce that a module offering this feature is now available! You can find all of the details on the page for the module, but it includes widgets and shortcodes that let you display that top users in any period of time.
Please check it out, and let us know if you have any ideas for other features to add to it in the future.