Brick + Beam Detroit

Usually the issue is moisture from inside leaking into the cavity between the storm and window and subsequently condensing on the glass. Have you considered adding thin stick on foam weather stripping to seal between the inside window and the frame?

Since you have treated other windows in the same manner (new wooden storms), let's focus on what is different about THIS window. Allowing "air flow" may alleviate the moisture build up when it appears, but it doesn't address a source. You should consider moisture leaking through your roof, eaves, siding near or above the window. Check your moisture and temperature at the top and bottom sills. Another lessor consideration would be landscaping cover and exposure, if the window is especially shielded from the elements..

Thanks for the replies. The other windows have the original wooden storms or at least much older ones. Its a second story window with no landscape covering. How do you go about checking the temperature and moisture at the two sills? WIth it warming up now the moisture is of course gone. In the Winter it is only on the inside of the storm glass and actually freezes. It accumulates near the bottom of the glass on the storm windows and climbs upward a bit depending on the temperature. I was wondering of it was heat escaping through the leaded glass interior windows but it still happens when I put the plastic shrink wrap window coverings over them as well.