What exactly was the question?
Question was, when season ends. In Finland I know on an average, when it starts and when it ends. Difference can be + 3 week and -2 week. It means difference over one month. In 4 summer month is is big difference.
Sometimes all honey has come to hives before 15.7. and another summer it starts after that.
In Finland bee summer starts 1.5. and it is over about 10.8. After 10.8. you can take all honey away. Earliest start is 15.4. and that has happen a couple of times during my bee keeping 40 years.
The honey, we take away, comes to hives during 28.6.-10.8. It is 6 weeks.
1.5. willows starts blooming and it explode the brooding. It takes over one 6-7 months that bees starts to collect honey and pollen. So we are in the middle of June.
Willow starts blooming when soil frost is started to melt. Our soil is frosen from 0,5 meter to 1,5 metre. We have 40 willow species in the botany book.
I can say, that season is very steady in some meaning. At least we must do actions, that they match in every year.
After 40 years beekeeping is mostly boring. I must find something new that I am inpired in bee keeping.
My 17 years old son got bee suit and so we see, what he likes about bee business.