Cicadas Will Begin To Emerge Once The Soil Temperatures At 8.00” Reach About 63°/64° F
Cicada are cold blooded therefore they have to rely on warm air temperatures and/or direct sunlight to sing, mate and fly and their black skin color helps that process. The massive emergence by cicadas is based on their strategy of survival and is referred to as “predator satiation”. Pretty much, they reproduce by the millions in order to surprise and overwhelm their predators (birds, squirrels, snakes, lizards, raccoons, etc).
This ensures that enough survivors will be left behind to reproduce. If you dig in the right place, you can on average find about 30 to 50 nymphs in a hole about 1 square foot.