The reported change is a per-decade rate
Nature Reviews Earth & Environment
The review states that the Arctic melt season lengthened by about 7.4 days per decade during 1979–2024.
Based on: Nature Reviews Earth & Environment
Verdict
False
Verification confidenceHigh
Explanation
No. The paper says the Arctic sea-ice melt season lengthened by about 7.4 days per decade from 1979 to 2024, not by about one week over the entire period.
Over roughly four and a half decades, that rate implies an increase of about 33 days. A separate open-access study published in April estimated a nearly 40-day increase since 1979, driven mainly by later autumn freeze-up.
A University of Washington Q&A described the change as about 7.5 days since 1979, apparently omitting “per decade.” Recent melt-season length has also been highly variable and roughly stable since 2010, but at a much longer level than in the early record.
Key takeaway
The roughly one-week figure is a per-decade rate, not the total change since 1979. Across the full period, the increase is closer to a month.
Evidence
Contradicts the claim
Independent analysis finds a multi-week increase
Communications Earth & Environment
A separate satellite-based analysis estimates that the Arctic sea-ice melt season lengthened by nearly 40 days since 1979.
Based on: Communications Earth & Environment
The public-facing Q&A drops the per-decade unit
University of Washington
The university Q&A says the melt season became about 7.5 days longer since 1979, wording that differs materially from the review’s per-decade rate.
Based on: University of Washington
Sources
Nature Reviews Earth & Environment
Changes in Arctic and Antarctic sea-ice properties and processes
Sep 2, 2026Communications Earth & Environment
A recent stabilization in the lengthening of the Arctic sea ice melt season into a highly variable regime
Apr 23, 2026University of Washington
Q&A: The Arctic melt season is a week longer now than it was in the 1980s, shows new UW research on sea ice trends
Sep 2, 2026Was this check helpful?
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