I always enjoy explaining/using the squint test with people. Easy to explain, use, and watching others make the squinting face is icing on the cake.
Its sad people don't use Squint test designing content heavy pages or apps, a lot more than they should :P. Squint test makes CTA more prominent and reduce direct users eyes to pages that need interaction.
I use this The Squint Test extension to bring squint effect on Chrome.
Also you can further optimize that page by
- Increasing contrast between Seattle and the time by making font lighter than Regular or changing its sizes
- Introducing another lighter shade of grey
- Adding affordance to [Add a city] with a border.
Again this is just some suggestions I gave skimming your blog post, context of the app matters as well as style guide specifications.