I have downloaded country raster elevation data from [Diva-GIS](http://www.diva-gis.org/gdata) and added 1 degree grid from "View >> Decorations >> Grid" as seen in the image below. Now, I want to know the highest elevation within each grid, how do I get this done?

[![enter image description here](https://i.stack.imgur.com/4MVMJ.png)](https://i.stack.imgur.com/4MVMJ.png)