Wikipedia has an article on METAR information explaining the very basics.
These sites make METAR information publicly available:
Copy METAR strings found on these pages to aerowx-metar.
Some clouds over San Francisco (USA):
KSFO 050756Z 11007KT 10SM SCT035 BKN200 10/06 A2983 RMK AO2 SLP099 T01000061 401720039
Rainy in New York (USA) with limited visibility:
KLGA 050808Z 04007KT 1SM R04/P6000FT -RA BR BKN006 OVC014 06/04 A2967 RMK AO2 P0001 T00560044
A foggy night night in Miami (USA):
KMIA 050753Z 18007KT 5SM BR FEW005 23/23 A2997 RMK AO2 SLP149 T02280228
No wind in Geneva (Switzerland):
LSGG 050820Z VRB01KT 9999 FEW070 BKN110 M03/M04 Q1033 NOSIG
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