Two sources, one signal
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GLOVIZ picked Temperature Madrid from Open-Meteo and Temperature London from Open-Meteo: two institutions, two measurement programmes, one signal. The pair qualifies because the changes move together, not just the trends, with r = 0.755 over 1,632 matched observations. Coincidences are filtered on the correlation board.
Temperature Madrid and Temperature LondonOpen-Meteo against Open-Meteo · Insights opens on load
Sources: Open-Meteo, Open-Meteo
The same two, plotted against each other1632 matched points · trend line open
Sources: Open-Meteo, Open-Meteo