I see you live in Michigan. During the winter months you have your furnace on. Usually in a home during the winter with a furnace running things dry out. You'll notice that it's winter time while your walking around your house you will get shocked by static electricity. Not that we don't have dry spells in the summer also but here in Ohio we have lots of humidity in the summer also.
My tanks evaporates more water during winter months. I have a small 3 gallon bucket for just these occasions. I top off mid week and that holds me over till water changes.
Slap a some glass on the top to slow it down if you choose?