I'm going to be shooting fishing and hunting videos. What is the best way to protect my GL2 from the various weather conditions that will come my way (which will range from 90+ degree heat to 25 degree cold/snow, with lots of potential rain in between)?

Hello Steve,
For basic protection from rain and snow you can get a good slicker, such as those available from PortaBrace (http://portabrace.com/asp/ProdDesc.asp?DescCode=RP)

For protection from deep cold, PortaBrace also offers a cover called the Polar Mitten that works very well.

I also recommend a good weather-repellent carrying case, perhaps one designed as a backpack based on your intended shooting situations.