I ride a bike every day. Knowing the morning and afternoon temperature determines how I dress. It's also incredibly useful to know if it's forecast to rain or snow for my ride home, so I can bring the right jacket. That's basically why I check a weather app every day.

And here in New England, knowing if it's going to rain or snow on the weekend, might effect what plans you make. We also have times of the year where the temperature can change 40F or more between morning and afternoon.

So looking out the window and deciding how warmly to dress, can leave you pretty uncomfortable later in the day. :)