Combine the mayo, buttermilk, vinegar, salt, celery seed, pepper and dill weed in a covered container and shake until mixed well.
Combine the macaroni with the vegetables and toss with desired amount of dressing. Let stand in the refrigerator for at least an hour before serving to allow the flavors to meld.
Recipe by Cooking With MicheleĀ® at https://cookingwithmichele.com/2020/06/macaroni-salad/