The weather overlay tool has been fun to play with, though for some reason, the date updated isn't showing up properly so I've left if off. Nonetheless, it is a useful widget!
Blue Iris tools is indispensable for any instillation of BI. I used the weather overlay at first, but it started me down this path... Still a work in progress http://crowderfarm.com/weather.php
Be careful, that's a long twisty expensive path! The more you play with a weather station the more time you'll sink into tweaking the software and wanting to buy more toys (I'm still debating on the UV, solar radiation and soil sensors)