Climate indicators: dry days in rainy season (ddrs)

TechnicalInfo: cdo -yearsum -ltc,1 RRmask.nc out.nc Other: Number of dry days in rainy season: Let RRt be the daily precipitation amount on day t. For Ddrs count all days in one year where RRt < 1mm, but only in rainy season which means rs1_ons≤t≤rs1_ces or rs2_ons≤t≤rs2_ces, for climatological rs1_ons, rs1_ces, rs2_ons, rs2_ces.