Do you actually want to make the sensors , or do you want to use existing commercial sensors.You may be interested in this project.http://wmrx00.sourceforge.net/Its called Weather Station data Logger and it uses an Arduino with a custom shield to simulate an Oregon Weather Station Console and allowsPC monitoring of a wide range of Weather conditions.It can measure Humidity, Temperature, wind speed & direction , UV , Rainfall,Barometric Pressure.Ive built 2 Arduino based Weather Shields, and Im now in the process of making my own Temperature / Humidity Sensors using DHT22 sensors.
If you want to go the 1-Wire route, try Hobby Boards (http://www.hobby-boards.com/store/categories/Weather/).Mitch
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