Mine is calm in the morning, at one point, it would get really strong right after lunch, no matter what time I took lunch, as soon as I got back in the office, it would get very loud.
For the greater part of last year and this year, it's pretty tame in the morning, starts getting strong around noon but not too bad, I can mask it easy but around 3-6, it gets louder but with pressure, I can't explain it, and my white noise won't mask it fully. Then, the pressure just eases up and it gets quieter again.
Other times, if it doesn't quiet down before I leave home, it will quiet back down during my drive home.
I only experience this on workdays. During weekends, it's quieter than weekdays.