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Tokyo Average Temperature vs Arctic Sea Ice Extent (September)
Tokyo Average Temperature and Arctic Sea Ice Extent (September) correlate at r = -0.71 over 47 years (1979–2025), p < 0.0001. With the time trend removed, r = +0.02. 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 0.02 — the relationship is probably coincidental, not causal.
- Pearson r
- -0.71
- p-value
- < 0.0001
- Years compared (n)
- 47 (1979–2025)
- 95% confidence interval
- -0.83 to -0.54
- Correlation with the time trend removed
- +0.02
Sources
- Tokyo Average Temperature (°C): Open-Meteo (ERA5). Annual mean 2m air temperature for Tokyo from the ERA5 reanalysis.
- Arctic Sea Ice Extent (September) (million km²): NSIDC. Mean Arctic sea ice extent in September, the yearly minimum (NSIDC Sea Ice Index).
Related pairs
- Arctic Sea Ice Extent (September) vs US Mobile Subscriptions (r = -0.92)
- Arctic Sea Ice Extent (September) vs US Resident Patent Applications (r = -0.91)
- Arctic Sea Ice Extent (September) vs US Adult Obesity (r = -0.91)
- Arctic Sea Ice Extent (September) vs US Population (r = -0.90)
- Arctic Sea Ice Extent (September) vs US Marriage Rate (r = +0.90)
- Atmospheric CO₂ (Mauna Loa) vs Arctic Sea Ice Extent (September) (r = -0.89)
Correlation does not imply causation. How the verdict is worked out.