I'm clearly not answering the right question anymore but from what I can see, the highest grossing film of the calendar year (i.e including holdovers from the prior year) has never come from a single opening weekend as late as March. Extremely niche record but hey.
This is assuming Captain Marvel passes Aquaman's current 2019 calendar gross (which is ~134m as of today) in it's opening weekend, which isn't necessarily guaranteed. Really puts into perspective how absolutely shite the box office has been for the last couple of months.