OP, you will probably need yearly or more often clean out, or the possibility of gutter guards. I did install these up North with mostly good results. Just saw an article recently (I do not remember where) that mentioned the need to have the gutter guards be removable, in case cleaning is needed. I do not know which type would be useful for pine needles, but I think consumer reports did a review of these devices.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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