Does high humidity air transfer sound better than dry air?

[gary350]

TL;DR

Sometimes highway traffic 1/4 mile away sounds like its in our yard then other times traffic is hardly noticeable.?

2 weeks of no rain traffic is hardly noticeable. Now 5 days of none stop rain traffic sounds like its in the back yard.

Does high humidity air transfer sound better than dry air?

 

[Baluncore]

Road traffic makes more tire noise when the road is wet.
Humid air is less dense than dry air at the same temperature and pressure.
Hot air can dissolve more moisture than cold air.
A horizontal stratification of temperature can duct sound in a waveguide, rather than inverse square law.