Hi Ronald:
Here in my area of Illinois, the black walnut crop was extremely poor due to drought -- as was our acorn crop. Black walnut is usually a consistent producer of hard mast, so I was a little surprised just how much the drought impacted black walnut production.
A decline in hard mast can usually be attributed to two factors: weather-related phenomena such as drought or late season frosts; and decline after a heavy mast year (2021).