Far too few musicians are aware of the care that a quality instrument requires, especially in daily use. The way you handle your guitar has a major impact on its appearance, longevity, playability, and sound.
As a general rule, a guitar can handle deviations of up to 5% below the relative humidity in which it was manufactured, and even 10-15% above.
The following table provides a brief overview of potential damage typical of unfavorable climatic conditions:

