BELL 206 PLT ENCOUNTERS LOW CEILINGS AND VISIBILITY; ELECTS TO DO AN 'OFF FIELD LNDG' AND WAIT FOR THE WX TO PASS PRIOR TO CONTINUING TO DEST.

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WE LIFTED OFF THE SITE TO APPROX 500 FT AGL AND STARTED TO FLY E AROUND THE CITY OF COEUR D'ALENE ENRTE TO THE AIRFIELD FOR FUEL (WE HAD 25 GALLONS/1 HR ON BOARD). THE AIRFIELD WAS IN SIGHT FROM 5 NM AWAY AND A CEILING I ESTIMATED AT 4000 FT MSL. I TUNED ASOS ON AND IT WAS RPTING A 100 FT OVCST. SINCE I COULDN'T LEGALLY OPERATE IN CLASS B AIRSPACE; I LANDED IN AN OPEN; UNDEVELOPED FIELD AT THE END OF A STREET (CLOSEST VEHICLE A STEAM ROLLER 500 YARDS AWAY). I WAITED 20 MINS ON THE GND TO WAIT FOR THE HVY RAIN SHOWER TO PASS. I POPPED UP TO LISTEN TO ASOS. I COULD SEE THE AIRFIELD; AGAIN ESTIMATED THE CEILING 4000-4500 FT MSL AND THE SHOWER HAD MOVED WELL N OF THE AIRFIELD; BUT THE ASOS WAS STILL RECORDING/RPTING 100 FT OVCST. I MADE THE ASSUMPTION THAT THE ASOS WAS MALFUNCTIONING; FLEW A NORMAL PATTERN AND LNDG AT THE COE ARPT TO OBTAIN FUEL FOR THE LAST LEG OF THE FLT. AT NO TIME DURING THIS EVENT DID I OBSERVE THE CEILING GO BELOW 1000 FT. WHEN THE RAINSHOWER WAS DIRECTLY OVER THE AIRFIELD; THE VISIBILITY WAS REDUCED. AT NO TIME WAS MY FLT VISIBILITY LESS THAN 5 NM OR WAS THE CEILING LESS THAN 1500 FT AGL.