We have a 1-wire weather station at our current location, it was originally designed and manufactured by Dallas Semiconductor. They no longer sell the unit but Automatizacion Aplicada a Gasolineras, a Mexican engineering company, now distributes a updated version. We purchased ours from AAG for $79 + shipping. The package arrived promptly.
The weather station software we use is One Wire Weather. It runs as a background task on our Linux fileserver. The program parses out the weather data and uploads it to the Weather Underground every few minutes. This is our current local weather stats page. The weather station unit has been up and running for almost a year now and has been very reliable.
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