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London Average Temperature vs US Median Age

London Average Temperature and US Median Age correlate at r = +0.71 over 64 years (1960–2023), p < 0.0001. With the time trend removed, r = +0.12. 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 0.12 — the relationship is probably coincidental, not causal.

Pearson r
+0.71
p-value
< 0.0001
Years compared (n)
64 (1960–2023)
95% confidence interval
0.56 to 0.81
Correlation with the time trend removed
+0.12

Sources

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Correlation does not imply causation. How the verdict is worked out.