The humidity goes down with the temperature, so if you are finding the fridge humid checkCheck the temperature and if that is: it should be around 37°F then check(3°C). If the temperature checks, look around the door for an air leak. Sometimes the door seal gets loose or dries out, letting the outside humidity in, which then condense on the food making it easier for batterybacteria to grow and spoil the food.
If you still find it too humid you could try a box of Polar King