There are many wireless weather stations on the market, transmitting their data across to the receiver using inexpensive 315 or 433 MHz data links. This method allows one to easily receive the data with Arduino-based hardware and then get to work decoding the protocol in order to analyse the data (as demonstrated in the book "Practical Arduino" by Jonathan Oxer). Another example of this has been demonstrated by the 1474orchard blog who have demonstrated how they analysed the incoming data from their station. They used an Arduino to detect the gap between data transmission in order to generate a sync pulse to start a logic analyser, allowing them to capture the transmitter's data and move forward with decoding.
This is a great demonstration of how to capture and analyse wireless data with an Arduino, so click here to get started. And for more, we're on twitter and Google+, so follow us for news and product updates as well.
If you're interested in using wireless data links with your Arduino project, we have two convenient receiver shields - both 315 MHz and 433 Mhz. Combined with the Getting Started guide you'll be up and going in no time. For more information check out theproduct page.