Temperature and humidity can have a large impact on your guitar's tuning. Too much or too little moisture will warp the thin wood of your guitar, making it difficult to tune. Eventually, inappropriate levels of humidity will lead to cracks or may even cause the instrument to break or snap....
“I’ve had two clients who left their guitars sitting in a window during a rainstorm. Another client hung his guitar up inside the shower to humidify it and got water inside. When they brought in their guitars for repair, I saw mildew eating the protein in the hide glue. I thinkDampit...