Above freezing temps in Beaufort:
I think a long-time poster here (can't remember their name) has repeatedly emphasized the importance of warm, moist air for its melting effect.
At this point, albedo is still quite high because there are few melt ponds, still significant snow cover, etc. so the near 24 hour solar input is mostly reflected. But we see the weather maps predicting several episodes of warm air blowing over the very hot, recently melted tundra of Alaska and eastern Siberia... onto the Chukchi, Beaufort and ESS. In some areas, the wind will blow over 20degC land masses, picking up lots of moisture.
I think that is more important than whether the air temp is +2 or -2 C. The moisture will condense, and the air temp will drop to near freezing no matter what... the air temp is pegged to the freezing point over ice until melt ponds and open water appear. So if +5C very dry air blows over the ice, a very small amount of melting occurs, and that air mass drops to 0 or +1 C.
But if +20C air at 90% humidity blows over the ice, the air mass still drops to 0 or +1 C, but it has added many more joules to melting the snow and ice due to condensation of all that moisture.
Let me try a bit math to quantify this:
1. Dry, +5C air cools to 0C ~= 5 kJ/kg dry air
2. Moist, +20C air cools to 0C ~= 20.2 kJ + 25 kJ/kg moist air = 45.7 kJ
(the +20C moist air loses about 0.01kg of water per kg of air, releasing 2507 kJ/kg H2O as it condenses)
So more than nine times as much heat delivered to the ice.
(hopefully I got the physics and math right)