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L'Altipiano svizzero sta vivendo il mese di dicembre più asciutto dall'inizio delle misurazioni nel 1864. Sono caduti, dal Lemano al lago di Costanza, in media due millimetri, ossia due litri di acqua al metro quadrato. Alcune zone occidentali non hanno registrato alcuna precipitazione durante tutto il mese, come indicato da MeteoSvizzera.
Le misurazioni dal 1864 ad oggi
Il mese di settembre del 1865 e quello di aprile del 1893 sono gli unici periodi in cui l’Altipiano ha registrato quantitativi di precipitazioni inferiori, rispettivamente 1,7 e 1,1 mm.
La media pluriennale per il periodo tra il 1981 e il 2010 mostra che piovono circa 90 mm in questo periodo e mesi di dicembre con meno del 10% rispetto alla norma sono molto rari. Durante i 153 anni per i quali sono disponibili misure solo altre due volte è stato così asciutto: nel 1963 (4,8 mm) e nel 1864 (6,0 mm).
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