Cold nights percent (tn10p)

TechnicalInfo: cdo -eca_tn10p -ydrunpctl,10,5 TNref.nc -ydrunmin,5 TNref.nc -ydrunmax,5 TNref.nc out.nc Other: Percentage of cold nights: Let TNt be the daily minimum temperature on day t and let TNin10 be the calendar day 10th percentile centred on a 5-day window for the base period 1981-2010. The percentage of time for the base period is determined where: TNt < TNin10.