Yes; kinda. In my spot I've seen some variation on that... with the easier ones starting early July, my first sativa/durban was a hard lesson learned because it waited until late September(12/12) to do it & then needed 11-12 wks.
That right there is why people started breeding more in the 70s-- trying to grow a Mexican plant in a climate like NW pacific US.... There was a practice of doing light-period control with refirgerator boxes. aka "black boxing", old-school light-dep.
Science in weed growing was slooooooow to propagate in the olden days.
That'd be a half hour from the "mythical" 9 hours of dark being the trigger... ?
We call them photo-period but it's actually "dark-period" (ewww hahaha) that triggers the flowering.
It's usually mid-august when I expect everything to be blooming (here).
Then I've had clones taken out that simply started flowering in June .
As a visual example of what works well in the climate north of me(emerald triangle) check out lightdep.com and use the google virtual tour. I used that as a study guide essentially.