Aviation Digital Data Service (ADDS)

Output produced by METARs form (0702 UTC 18 December 2017)
found at http://aviationweather.gov/adds/metars/
 
KDCA 180520Z 1806/1912 00000KT P6SM BKN060 
     FM181200 00000KT P6SM SCT040 
     FM190300 VRB03KT P6SM BKN040 
     FM190600 VRB03KT P6SM BKN030 
     FM190800 VRB03KT P6SM SCT030