Aviation Digital Data Service (ADDS)

Output produced by METARs form (1203 UTC 21 December 2014)
found at http://www.aviationweather.gov/adds/metars/
 
KBOS 211121Z 2112/2218 01007KT P6SM OVC015 
     TEMPO 2112/2114 4SM -SHSN 
     FM211700 03007KT P6SM OVC040 
     FM220300 01006KT P6SM BKN025 
     FM221500 36005KT P6SM BKN015