Cloudiness

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Cloudiness is measured as a percentage of the sky obscured by clouds. For example, a very cloudy day might have a cloudiness measurement of 90%, whereas a day with clear skies would have a cloudiness measurement of 0%.

Based on this data, there appears to be no relationship between a city's latitude and its cloudiness on June 25, 2019. It does appear, however, that many cities across the world had clear skies on that date.