I have a thermometer and relative humidity monitor in the basement. You can buy them cheap.


My humidity stays pretty much around 85% in winter. Veges like my carrots, beets and parsnips are packed in damp sawdust.

Our soil around my root cellar is clay so it has problems draining and it holds the moisture. I had to paint my cement walls with DriLock paint. Before I had it done, 3 feet of water had wicked through the wall. That DriLock paint really works.