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The back of the Griffin Survivor case details the testing standards that the case was certified for. Note that this case meets US Military Standard Mil-STD-810F.
The wind and rain standard is important to me as a soccer coach in Washington State where half of our season is spent playing in the rain. As you can see the case was tested in rain for 1 hour at 7.8 inches/hour.
The iPad 2 is an expensive piece of gear and occasional drops are expected if you carry it around with you. Thankfully, the case was tested to withstand a drop of 6 feet to a concrete floor. I wasn't willing to test my $829 iPad 2 by dropping it myself, but feel free to do so yourself :)