Launch Excel and load the spreadsheet containing the data you want to plot. Select the first set of X and Y axis data for your chart. Click the "Insert" tab, and then select the chart type and sub ...

For example, you could show line graphs for temperature and humidity on top of each other. For this purpose, Excel lets you add a series of data to a chart and plot it on a second y-axis.

This article explains how to add a secondary axis to a chart in Excel so you can view unlike categories on the same graph. These instructions work in Excel in Microsoft 365, Excel 2021, Excel 2019 ...