Big drops takes 2017 down to 2012 level, both extent and area. Most of the extent drop in the Beaufort/Chukchi/CAB border with contribution from removal of former fast ice in ESS and Laptev.
The first-of-the-month effect is small with this product: drops in Bering and Okhotsk together about 2k.
Update 20170801.
Extent: -163.7 (-140k vs 2016, -611k vs 2015, -493k vs 2014, +112k vs 2013, -1k vs 2012)
Area: -188.1 (+27k vs 2016, -826k vs 2015, -478k vs 2014, +321k vs 2013, -17k vs 2012)
Extent: -163.7 (-43k vs 2016, -140k vs 2015, -611k vs 2014, -493k vs 2013, +112k vs 2012)
Area: -188.1 (+124k vs 2016, +27k vs 2015, -826k vs 2014, -478k vs 2013, +321k vs 2012)
[EDIT: Steven pointed out the error, the comparison with 2012 was with still with SSMIS data and other years pointed to the wrong year]
The details (in 1000 km2):
Extent:
Central Arctic Basin East Siberian Sea Laptev Sea
-46.4 -26.1 -14.2
Kara Sea Barents Sea Greenland Sea
-2.7 -1.4 -20.6
Baffin/Newfoundland Bay St. Lawrence Hudson Bay
-10.1 0.0 4.8
Canadian Archipelago Beaufort Sea Chukchi Sea
-11.8 -29.2 -3.9
Bering Sea Sea of Okhotsk Total Extent
-1.4 -0.8 -163.7
Area:
Central Arctic Basin East Siberian Sea Laptev Sea
-122.1 -13.9 -3.5
Kara Sea Barents Sea Greenland Sea
-6.8 0.1 -12.6
Baffin/Newfoundland Bay St. Lawrence Hudson Bay
-12.0 0.0 3.8
Canadian Archipelago Beaufort Sea Chukchi Sea
-11.7 -5.9 -1.8
Bering Sea Sea of Okhotsk Total Area
-1.0 -0.6 -188.1
Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.