Trump and Carter were experiencing a bit of a rebound at this point in their terms due to Covid and the hostage crisis, respectively. But both went on to see their approvals dip.
Of course I'd like to see Biden with higher numbers, but Presidential approval isn't what it used to be. With today's fractured and polarizing media landscape, it's really hard for any President to be above 50% for a long amount of time.
This November, one of two things will become clear: That Biden's low approval ratings made him just as vulnerable as any other one-term President, or that the extraordinary circumstances and stakes in this race mattered more than what they thought of Biden.
When it comes to 1st quarter averages, COVID wouldn't factor in that much. The first impeachment is what unified Trump supporters behind him. That's something Biden needs honestly. The Biden impeachment actually happening would've been the greatest gift the GOP could've given him. His approval is going to rise through the election and I doubt he'll be that much lower than 45% on e-day if he is lower in the first place, but it's better for him to get that ball rolling earlier.