This app really isn't suited for the "hardcore" weather user -- there's no radar, no computer models, no satellite picture, no cute little graphics. It's a time and temp style interface that also provides some other basic data. It's basic, serves a "what time is it and what's it doing outside now" purpose, but does give some flexibility.
The default settings are humidity, precipitation, pressure, and visibility below time and temperature. You can change those, change your location, and add locations as you see fit through the top bar. Top left gives you the location option, top right gives you the ability to move the "extras" around and show different conditions. I rearranged my four settings to show sunrise, sunset, dew point, and pressure. In the winter, I can show wind chill but no heat index in the summer.