.
Yeah... the 17 year periodic ones come in batches...
the last batch failed to make a showing in 'Jersey
a couple/few years ago... frown
So far it's a no-go here as well.

I read that they won't poke out of the ground
unless/until the SOIL Temp. is a CONSISTENT 70F.

So far EVERYTHING Here in the North East has
been over a MONTH LATE. frown
Yes, that makes a HUGE Difference since they're
not the only insect or crop dependent upon an
exact number of days at a precise temperature.

ABOUT Degree Days

Insects/Pest-Control

Degree Days CROPS

yeah... me too...

...but trust me, it's essential to farmers.

* as it relates to Heating your home:
NOAA Degree Days Heating
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"...or am I a butterfly dreaming she's a woman?"