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From page 1...
... 1 Highway noise changes from day to day and hour to hour -- not just because of variations in traffic volumes, vehicle mix, and speed, but also because of the weather. In some cases, traffic noise can increase by more than 10 dB in as little as one hour due to changes in meteorology.
From page 2...
... 2 How Weather Affects the Noise You Hear from Highways AERMET surface meteorology data files to estimate how many hours in the year will have adverse weather conditions with respect to highway noise. The research team also reviews statistical models, lookup tables, research models, approaches to creating an engineering model, and a framework for updating FHWA's TNM, which currently assumes an acoustically neutral atmosphere.

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