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Climatic Distance

According to the Meteonorm definition, the "Climatic distance" between two sites is the quadratic sum of their horizontal distance and the altitude difference weighted by a factor of 100:

\(DistanceClim = SQRT ( Dist Hor ² + (100 · Diff Altit)² )\)

Following Meteonorm Standard, it can be admitted that a weather data site is representative of a given place if their climatic distance does not exceed around 20 km.