Penny, humidity may be a big problem for a lot of people right now, but you should be looking beyond that. Check your attic now for water and ice. If you find it, resolve how it got there and stop it from happening again. Then go one step further.
Wait until this summer and send one person to the roof with a hose. Have another person in the attic where the chimney is. Have the person on the roof spray water all around, heavily and all over the area while the person inside is searching for water leaks. That is a good possibility and remember that water under your roof can travel down any of the wood. The drip you see can originate from a bad spot in the roof that is far away from where you see the water dripping.
Have the person in the attic stay there and the person on the roof keep spraying water on the soffit and eaves, -- not on the eave vents. You may very likely find a rotten board that is allowing water through. The paint will be gone or bubbled in all probability. Have the board replaced and the gutters fixed.
The water can be in your wall but it can come in through your roof, around your chimney, through a bad fascia board or about anyplace that there is a place. Ice damming or condensation can cause all sorts of problems and it is logical to check this now, but it's not the only possibility.