Can someone explain to me during which season the fretboard arcs in and during which season it arcs out? My bass was dropped the other day and it doesn't have much of an arc at all, anymore. I'm not sure if it is warped, still plays fine.
It's not purely season related.

It depends on humidity as well, and also where u store ur guitar.

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Its not a seasonal thing. The wood is sensitive to temp and humidity changes, but that could occur at anytime, not just in a certain season. The "arc" you are speaking of is called relief. The only way to find out if you have the proper amount of relief is to check it. Go here and learn how - http://www.fretnotguitarrepair.com/trussrods.htm
the guitar neck will warp if left in conditions other than room temperature. Humidity is the main reason for it's warping, season doesn't matter unless you're leaving it outside.

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