Im in Northern NJ at what point should I be nervous that pharaoh cicadas haven't come forth yet and what would happen if they never came forth?

Typically they come out of the ground in June but we keep having 1-3 days below 65f at night so they have not been around yet.

submitted by /u/filbertsnuts
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source https://www.reddit.com/r/Entomology/comments/obkzxx/im_in_northern_nj_at_what_point_should_i_be/