A recent squarespace update now means that interactive graphs can now be added to any page via the squarespace admin area.

No matter what your ideas are, Squarespace wants to provide you with the tools to present them in a beautiful way. That’s why we’re excited to announce the newest addition to our tools: Chart Blocks. Whether you’re a non-profit organization, a financial or political blogger, or just really like graphs and stats, Chart Blocks allow you to present your data in an effective and attractive way.
— Squarespace

Chart Blocks are available in three variations: line, bar, and pie. They’re fully responsive to maintain full impact on tablets and mobile devices. They can also be customised using a selection of colour palettes.