NOAA refers to the Month end Arctic ice extent by averaging the last five days extents.  Thus monthly gains and losses of ice can be obtained by subtracting the previous month end ice amount.  The chart above shows the April month end Arctic ice extents since 2007, comparing the two relevant datasets: Sea Ice Index (SII, based on satellite microwave sensors) and Multisensor Analyzed Sea Ice Extent (MASIE, based on multiple sources including several satellite sensors and visual analysis).

A sine wave pattern is evident starting after the low 2007 extent, rising to a peak in 2012, declining to 2019, before returning to the mean the last four years.

After a sub-par March maximum, now in April, 2025, Arctic ice has closed the gap with the 19-year average.

During April the average year loses 1.1M km2 of ice extent.  Meanwhile 2025 lost only 0.538 M km2, about half as much.  The end result is MASIE showing a slight deficit and SII a small surplus at end of April.

The regional distribution of ice extents is particularly revealing, as shown in the table below.

Region	2025120	Day 120 Ave.	2025-Ave.	2007120	2025-2007
(0) Northern_Hemisphere	13428208	13510326	-82118	13108068	320140
(1) Beaufort_Sea	1071001	1068240	2761	1059189	11811
(2) Chukchi_Sea	963094	957153	5942	949246	13848
(3) East_Siberian_Sea	1087137	1085746	1391	1080176	6961
(4) Laptev_Sea	893105	891206	1899	875661	17444
(5) Kara_Sea	927530	915007	12523	864664	62866
(6) Barents_Sea	563013	552738	10275	396544	166470
(7) Greenland_Sea	703059	661036	42023	644438	58621
(8) Baffin_Bay_Gulf_of_St._Lawrence	1129634	1194283	-64650	1147115	-17481
(9) Canadian_Archipelago	854878	849548	5330	838032	16846
(10) Hudson_Bay	1249532	1238910	10622	1222074	27458
(11) Central_Arctic	3244486	3231137	13349	3241034.13	3452
(12) Bering_Sea	441499	477412	-35913	475489	-33990
(13) Baltic_Sea	11180	21561	-10382	14683.79	-3504
(14) Sea_of_Okhotsk	287204	363423	-76219	295743	-8539

The table shows only three significant deficits to average; Okhotsk is -72k km2, and Bering adds -40k, together greater than the overall -82k km2, which is 0.6% below average.  The other deficit in Baffin Bay is  offset by surpluses in nearly every other Arctic basin with the exception of Baltic Sea. Clearly the core Arctic ocean is solidly frozen, with a few fringe seas going to open water slightly ahead of schedule.

Why is this important?  All the claims of global climate emergency depend on dangerously higher temperatures, lower sea ice, and rising sea levels.  The lack of additional warming prior to 2023 El Nino is documented in a post March 2025 UAH Yo-yo Temps.

The lack of acceleration in sea levels along coastlines has been discussed also.  See Observed vs. Imagined Sea Levels 2023 Update

Also, a longer term perspective is informative: