LOL. you do know that "trends" go down and up, don't you? No point on seizing on something that happens a few times, as it will change again.
Scott made his trek to the pole in the wrong year as it was unusually colder then ( ie it had been warmer in previous years ), and Shackleton picked the wrong year for his as there was more sea ice than usual ( ie there had been less in previous years ), which prevented him reaching land.
Weather changes all the time, and more sea ice may form next year, or not, as the case may be.