Please follow http://www.wcc.nrcs.usda.gov/webmap/index.html#elements=&networks=SNTL&states=!&counties=!&hucs=&minElevation=&maxElevation=&elementSelectType=all&activeOnly=true&hucLabels=false&stationLabels=&overlays=&hucOverlays=&mode=data&openSections=dataElement,parameter,date,elements,location,networks&controlsOpen=true&popup=&base=esriNgwm&lat=42.537&lon=-97.537&zoom=5&dataElement=PREC¶meter=PCTAVG&frequency=DAILY&duration=7&customDuration=&dayPart=E&year=2016&month=10&day=5&monthPart=E.