Temperature has been obtained from NCEP/NCAR as timeseries and composites. There is evidence supporting suggestions of melt ponding along the Alaskan coast, but much of the pack is cool/normal for recent years. Click on images to enlarge.
The timeseries cannot be calculated for a period, just on a monthly basis, so here is the timeseries for May, upto 2015.
The years 2010 and 2015 are a good place to start as upper and lower bounds of average May temperature.
I have used odd numbered days from 23 April to 11 May (the latest day available), and have calculated the difference for those days in 2016 and the same days in 2010 (a warm year) and 2015 (a cool year).
Current temperatures across much of the Arctic Ocean are not exceptional and lie between the warmest recent year and the coolest, temperatures remain well below zero over most of the Arctic Ocean, except for along the Alaskan coast. The following plot is in Kelvin, 273 Kelvin is approximately 0degC.
The low overall extent is due primarily to Barents and Bering and the Greenland Sea, Beaufort continues to fall. Chukchi is starting to fall as normal, ESS remains flat at peak winter extent, likewise Laptev and the Central Arctic, the CAA is falling as normal. Within the Arctic Ocean Basin (Beaufort, Chukchi, ESS, Laptev, Central), only Beaufort is abnormally low and falling abnormally, compactness follows this pattern.