Aviation Digital Data Service (ADDS)

Output produced by METARs form (0024 UTC 21 December 2014)
found at http://aviationweather.gov/adds/metars/
 
KSFO 202345Z 2100/2206 17004KT P6SM SCT012 BKN040 OVC100 
     FM210300 20005KT 6SM -RA BR SCT010 OVC030 
     FM211800 30006KT P6SM FEW010 BKN020 
     FM220200 29007KT P6SM SCT009 BKN010