Anemometer - Wind speed
Very accurate I am happy with this app and the app package is a great deal.
The Weather Station
Keeps everything in one place. Easy to setup and use.
Barometer - Atmospheric pressure
From a dense forest of bland weather apps arises this perfectly slender sapling of a measurement masterpiece. Measurement and analysis of absolute atmospheric pressure and it's changes form the very essence of the weather man's art. This graphically classic tool conveys barometric pressure in a richly satisfying way. This app shines on iPhone or iPad.