Yes, GitHubGitHub's now allows youPulse feature allows you to find an overview of all recent activity in a repository (here's their post announcing the feature). This would include:
- New/Closed Pull requests and Issues
- Number of authors who made commits during the period specified
- Number of commits made
- Number of files changed
- Number of lines added and removed
- List of top contributors to the repository
It is possible to select the desired amount of time you wish to see. Available options are 24 hours before, 3 days before, 1 week before (default) and 1 month before. You can access it using the left-most heartbeat icon of any repository. It is also possible to see statistics up to 1 year before by manipulating the URL and changing the time factor to "yearly" (i.e. if you are in the month view, change "monthly" to "yearly").