Aviation Digital Data Service (ADDS)

Output produced by METARs form (1008 UTC 18 January 2017)
found at http://aviationweather.gov/adds/metars/
 
KDEN 180858Z 1809/1912 20011KT P6SM SKC 
     FM181700 14007KT P6SM FEW250 
     FM190200 18008KT P6SM FEW250 
     FM190600 24013KT P6SM SCT250