Most Informative
The stock iOS weather app will do in most situations. But I also live in a place with low winds and little variation in weather. The temperature is the temperature.
That said, the stock weather app is difficult to add locations to, and provides very little other information besides the temperatures for today and His and Los for the rest of the week.
Weathermate provides a lot more information than that, dew point, humidity, wind, and my personal favorite, "feels like". I also love the temperature showing on the badge and the ability to be notified of, and read weather alerts.
The backgrounds it comes with are gorgeous (try switching to "text-only mode) and the only reason I took away a star is because some of the buttons could use a resolution update (slightly blurry on my 6+).
Overall, Weathermate is worth it for when you need the information.
Zenith.2011 about
Weather Mate Pro - Forecast