Regardless of the type of printer you are using, humidity affects paper. While paper is naturally very dry (many types of paper that are intended for use in digital printers contain just four to five percent moisture), air that is too dry can further dry out the paper which makes it prone to static electricity, which can cause it to jam. High humidity, on the other hand, dampens the paper, which can also be the cause of jams as well as diminished print quality.
Laser printers and copiers have a different set of issues that stem from their internal heat source which is called a fuser which uses heat to melt toner particles onto paper. Paper designed for laser printers is typically dryer than regular paper, since wet paper releases moisture as it passes through a hot fuser. When you have high humidity levels, the dry paper absorbs more moisture, increasing the chance that the water in it will boil unevenly as it passes through the fuser which will create “wrinkles”. At the same time, the toner will not stick to the paper as well when it is moist.
You can take steps to keep your paper safe from the environment. Store it off of the ground in an area that is at a similar temperature to where you keep your printer. Also, because many paper wrappers are treated with moisture blocking coatings, storing your paper in its ream wrapper until you need to print on it can also help a great deal.