L’estate 2017 potrebbe essere ricordata come una delle più calde della storia. Giunti alla metà della stagione si registrano già quattro gradi oltre la media e non sono previsti fronti freddi nei prossimi giorni.
In Vallese, dove generalmente nello stesso periodo sono censiti 26 giorni estivi con temperature al di sopra dei 25 gradi, ne sono stati contabilizzati già 35, ha comunicato venerdì SRF Meteo. La stazione meteorologica di Sion ha persino rilevato 17 giorni con più di 30 gradi. La media si situa a sette giorni di canicola. Nel Mittelland si sono contati finora 28 giorni durante i quali la colonna di mercurio ha superato i 25 gradi contro i 17 abituali.
In generale la Svizzera è stata più soleggiata rispetto alla media; a San Gallo nella prima metà del periodo estivo si sono registrate 80 ore di soleggiamento più della media e a Basilea e Zurigo 60. Pure la pioggia è stata più rara. Basilea ha registrato un terzo delle precipitazioni in meno della media.
ATS/EnCa
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