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Global Temperature Anomaly vs Arctic Sea Ice Extent (September)
Global Temperature Anomaly and Arctic Sea Ice Extent (September) correlate at r = -0.84 over 47 years (1979–2025), p < 0.0001. With the time trend removed, r = -0.00. Likely spurious (shared time trend).
Verdict: Likely spurious (shared time trend). Both series mostly just trend over time. After removing that trend the correlation collapses to -0.00 — the relationship is probably coincidental, not causal.
- Pearson r
- -0.84
- p-value
- < 0.0001
- Years compared (n)
- 47 (1979–2025)
- 95% confidence interval
- -0.91 to -0.73
- Correlation with the time trend removed
- -0.00
Sources
- Global Temperature Anomaly (°C vs 1901–2000): NOAA NCEI. Annual global land and ocean surface temperature departure from the 1901–2000 average (NOAA NCEI).
- Arctic Sea Ice Extent (September) (million km²): NSIDC. Mean Arctic sea ice extent in September, the yearly minimum (NSIDC Sea Ice Index).
Related pairs
- Atmospheric CO₂ (Mauna Loa) vs Global Temperature Anomaly (r = +0.97)
- Global Temperature Anomaly vs US GDP per Capita (r = +0.97)
- Global Temperature Anomaly vs US GDP (current US$) (r = +0.96)
- Global Temperature Anomaly vs US Population (r = +0.95)
- Global Temperature Anomaly vs US Cereal Yield (r = +0.94)
- Global Temperature Anomaly vs Atmospheric Methane (global) (r = +0.94)
Correlation does not imply causation. How the verdict is worked out.