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Gemtemperatuur. Gemiddelde zomer en wintertemperatuur in De Bilt nl br original text Data van CBS en KNMI br original text Jan Arkesteijn nl br original text Jan Arkesteijn Geen restricties PD Jan Arkesteijn original upload log page nl Gemtemperatuur Jan Arkesteijn bytes no Jan Arkesteijn bytes no Gemiddelde zomer