Static electricity is more problematic when there is low humidity, no matter what the season. The issue is compounded as electronic devices today are smaller and more susceptible to electrostatic discharge. Granted, most electronics have ESD protection built in; but over time or from a constant barrage of these tiny lightning-like strikes, the protection becomes corrupted, resulting in a failure. Anytime air is warmed, this only reduces the humidity further, increasing the likelihood of a static discharge.