But you are sending personal data (ip address) to a third party by directly connecting to their service. Not sure about canadian privacy law, but eu company would need to list this third party in their policy.

edit: just realized this comes across like bikeshedding. I do applaud and like your approach to privacy and its simplicity. It wouldn't decrease the appeal of your app at all to mention that you query the environment canada data, which is probably a public service and will not missue the data itself).