Same here. Except I am only closed for 2 weeks a year. I have no idea what is and isn't the norm in my area as I do what works for me, not necessarily what everyone else is doing.
I get that parents want most daycares to be similar but I try to stand out and not be like everyone else so I set my rules and policies according to what works for my family.
Interested clients can choose to sign on if my policies work or look elsewhere.
There is a right fit for everyone.
I do occasionally have families ask me to discount days or weeks in which I am closed or they were absent but I usually just refer them back to my handbook and let them know rates are based on enrollment not attendance and that payment is non-negotiable.