Ground snow cover alters outdoor sound propagation enough to warrant seasonal retesting.

Evidence

The measurements were conducted in the summer, and repeated in the winter with a snow cover on the ground at all sites except one (maple saplings). — Donald G. Albert, Michelle E. Swearingen, Frank E. Perron, and David L. Carbee, Low Frequency Acoustic Pulse…, 34

Categorization

• QUESTION: How much of the summer-winter acoustic difference is snow cover versus leaf-off and atmospheric change is left unresolved here.