If you want a little more freedom in placement, you might consider a LAN and/or WiFi enabled webcam.
I'm using a 640*480 D-Link DCS-2100G (maybe slightly overkill).
However, it does a pretty neat job, and has allowed me to experiment with placement around the house. Only recently have I come across the excellent light-enclosure idea referred also below, that I consider as maybe a final solution; probably mounting it on the waterpipe carrying the Anemometer, allowing for much better view. Again, I can put it just about anywhere as I'm not limited by USB-cable restrictions.
Another thing it allows me to do, is to address it directly from the web wathing a live video feed without any other software being involved. I'm considering offering this as a service as soon as I have redesigned the website (looking at implementing a carterlake-template based website).
A few examples attached, or look at 10min. updates linked below. The first link is the 'raw' image as fetched from the webcam, the other one is after being enriched with data thru WD.
http://vejr.axelsson.dk/netcam.jpghttp://vejr.axelsson.dk/netcam-enriched.jpgJust my 5c
/Niels