This plugin adds some functionaly to the temperature graph :

• exact values on hover
• zooming
• panning
• export

• hover over the graph to show date and temperatures under the cursor
• drag to zoom
• shift + drag to pan
• double click to reset axes / autoscale

Install via the bundled Plugin Manager or manually using this URL:

https://github.com/1r0b1n0/OctoPrint-Tempsgraph/archive/master.zip

When the plugin is enabled, it will replace the temperature graph. In the settings, "Features / Enable temperature graph" must of course be activated.