3.75 - 4.25 seems like kind of a safe bet to me, as "safe" as you can make a prediction. This means 2020 could end up being anywhere from 2nd to 5th lowest on record, which is a wide enough range for an outcome.
More than 4.25? Well, that would be a whimper of a melt season, and we have to consider it's already 2020, not 2015 or 2010 any more, so the expectations to go "down" are higher.
Less than 3.75? Maybe, but it seems like it needs some stars to align for that to happen. Which means at some time during summer the daily loss must really start sprinting compared to other years (apart from 2012). I don't have the know-how to call, how likely is that to happen.