Sound would travel faster outside of a forest because sound waves travel fastest and furthest when there are no obstructions (live big trees).
Here are some links about sound and the speed of sound.
Though I am by no means an expert in Forestry, it seems to me that humidity will usually be higher in a forest, as there is a lot of moisture from all of the life, it is typically darker, and it is somewhat closed from outside effects like sunlight and heat. If this is the case, the speed of sound will be slightly faster in the forest. This is because the speed of sound is faster in water (the molecules are closer together) than air, and in a humid environment, particles of water vapor replace oxygen and nitrogen molecules in the air.
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