Wintertime in Vermont is a different world. When walking outside, the whistle of the train from West Rutland (about 4 miles away) sounds like it's just around the corner. Why is that? Discovery.com says:
On a cold day, there tends to be a layer of warmer air above the cold pockets closest to the ground. When you shout to a friend down the street or hear your bus (finally!) arriving, the sound wave that would ordinarily go out in all directions gets refracted by that warm air. Because sound moves faster in warm air than colder air, the wave bends away from the warm air and back toward the ground. That's why sound is able to travel farther in chilly weather.
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