Most folks don't know that their 'frost free fridge' can be easily hacked to act as a dehumidifier. As it runs continuously, it can be used to suck unwanted moisture out of a humid home 24 hours a day.
Frost free fridges actually have a heating element. This heating element comes on every-so-often to thaw out the cooling plate. Any frost/ice that has formed on the cooling plate melts, drips into a plastic trough, drains to the bottom-rear of your fridge via a small tube, and then ends up in a plastic bowl located on top of your compressor.
The compressor, as it helps pump heat out of your fridge and into the surrounding air, also heats up. Heat from the compressor warms the bowl and evaporates the water, returning the moisture back to the room where it originally came from. So, under normal circumstances, this operation is humidity-neutral.
Assuming your fridge is against an external wall, or above an accessible basement, or near a drain, you can get a short piece of scrap tubing, attach it onto the end of the drain tube (just above the bowl), and instead of the water ending up in the bowl, it can be redirected outside, to a closed container or a drain. In any case, since it is no longer being heated and evaporated back into the air, it is effectively removed from the humidity equation and your internal air becomes drier.
Depending on how easy it is to access the back of your fridge, this hack takes mere minutes. It doesn't require any extra electricity, and it doesn't harm your fridge in any way. It's just the free 24/7/365 dehumidifier that everyone has in their kitchen but isn't aware of.
The more warm/humid air you have in the house, and the more often you access the fridge, the more moisture will be removed in this manner and the drier the house will become. It would seem to be a nice fit for a humid continental climate with year-round precipitation.
If you expressly don't want moisture removed during part of the year, you can always spend a few bucks on a diverter valve and install it so that by simply turning the valve you can direct the condensate to either the bowl (and retain the moisture 'inside') or to a drain/container/through a wall (and send the moisture 'outside'). Direct the condensate to the bowl when the internal air is dry and you don't want to make it any drier. Direct the condensate outside for the rest of the year.