The green treefrog (Hyla cinerea) is common throughout the southeast United States, and their presence is best known by their call, which can be heard from nearly a mile away on a still night. Their breeding season is quite extensive, and in Florida I have seen them breeding from April until October. They prefer more permanent water than some of the other treefrogs, and will even breed in water that contains fish.
Often they will call during a falling barometer, such as before a rain. Like most treefrogs breeding takes place at night, but intermittent choruses can be heard in the daytime, especially in the late afternoon. During the breeding season they will call continuously deep into the night, often in the company of other species of frogs and toads.