As Eric commented, it's difficult to say - there is no 'standard' tree, or leaf, or thickness, or rain/snow in those trees. It's hard to say. BUT, here's an example of one of our clients. This thread might give you some insight into our results.
http://community.cambiumnetworks.com/t5/ePMP-2000-and-1000/ePMP-2-4Ghz-Performance/m-p/56574#U56574
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