LWOC AT MUI; PA.

Narrative

EVENT OCCURRED AT THE CONCLUSION OF VFR FLT TO THIS ARPT (VFR FLT PLAN FILED; NOT ACTIVATED PARTICIPATING WITH ATC FOR FLT FOLLOWING) AT NIGHT. WX BECAME MVFR AT 5; 4 AND 3 MI OF VISIBILITY. ON APCH FROM VOR; I CALLED ON CTAF AND FOUND THE TWR STILL OPEN. I WAS APPROX 6 MI AWAY. INSTRUCTED TO RPT BASE FOR RWY 7. THIS MEANT A XWIND; R DOWNWIND TO BASE. VISIBILITY WAS REDUCED FROM PRIOR TO APCH. CALLED TWR TO CONFIRM WX. TOLD VISIBILITY WAS 3 MI; SCATTERED 1400 FT AGL AND CEILING AT APPROX 2000-2500 FT AGL IN HAZE. I WIDENED OUT E FIRST; THEN WIDER DOWNWIND S OF FIELD WHILE I DSNDED TO PATTERN ALT; EXTENDING DOWNWIND TO APPROX 6 MI W OF THE FIELD. ON 2 POS CALL TWR SAID THEY DID NOT HAVE ME IN SIGHT AND TURNED UP LIGHTS OF FIELD. I TURNED IN AND JUST BEFORE 3 MI I SPOTTED THE FIELD. I ADJUSTED MY APCH TO LINE UP ON FINAL THEN CALLED TWR. NOW AT 2 MI I CALLED 2 MI OUT FROM EXTENDED BASE ON FINAL. TWR SAID 'NOT IN SIGHT; CONTINUE ON IN.' (ALL LIGHTS ON ACFT WORKING.) I LANDED. TWR SAID NOT SEEN. THEN CALLED WHILE TAXIING TO SAY IN THE FUTURE TO CALL ON FINAL; SHE HAD NOT OFFICIALLY CLRED ME TO LAND. I HAD CALLED ON FINAL AND UNDERSTOOD I WAS OK TO 'COME ON IN' AND LAND. MY PERCEPTION WAS THAT I WAS CLRED. I WILL CONFIRM IN THE FUTURE THE WORD 'CLRED.'