Brood X Cicadas
Because ground temperature provides an important cue for cicadas' emergence, and spring temperatures have trended higher since the great-great-grandparents of this year’s Brood X cicadas emerged in 1970, that cue is likely to arrive sooner.
Cicadas typically emerge in force when ground temperatures reach approximately 64°F degrees, often after a steady rain. Some places with Brood X cicada concentrations have already reached that temperature threshold. The 10-day average temperature across the Brood X region is running 8.0°F warmer than at this time in 1970, and 1.1°F warmer than in 2004.