A CESSNA CONQUEST PLT MADE A VFR APCH AND LANDED WITH THE ORT RPTED WX BELOW LNDG MINIMUMS.

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PROB: VIOLATED ARPT WX MINIMUM RULES. ON IFR FLT PLAN ARR TO ORT; CTR CLRED ME FOR VISUAL APCH WHEN I ADVISED ZAN THAT I HAD A VISUAL ON ORT ARPT 30 DME OUT. AT 20 DME; I CONTACTED WX OBSERVER AND WAS TOLD WX WAS 1/2 MI; SKY OBSCURED. I COULD NOT BELIEVE WHAT I HEARD; SO I ADVISED THE WX OBSERVER I WAS 17 DME AND HAD VISUAL ON ORT AGAIN SAME WX RPTED. SINCE I WAS IN VFR CONDITION SKY CLR AND 30 MI OR GREATER VISIBILITY. I CONTINUED; ENTERED L DOWNWIND TO RWY 22. ARPT AND SURROUNDING TERRAIN; TREES; LAKES ALL VISIBLE. CTR ADVISED TO GO TO ADVISORY FREQ AND CANCEL IFR WITH CTR ON ARR. I WENT BACK TO ADVISORY AND CONTINUED VISUAL APCH. TURNED ON FINAL APCH STILL SKY CLR AND 30 MI VISIBILITY. RWY LIGHTS AND VASI FULLY VISIBLE FULL LENGTH. WAS A THIN FOG OVER THE MIDDLE OF ARPT AND TO THE W AT 50 FT AGL; TREE TOP. 30 MI AND CLR SKY CONTINUED TO TOUCHDOWN; AT WHICH TIME VISIBILITY DROPPED TO 2 MI ON ROLLOUT. I CONTACTED CTR AND ADVISED ON AT ORT AND TO CANCEL MY IFR. AFTER SHUTDOWN AND DEPLANING; I REALIZED THE RPTED WX WAS BELOW AUTH NON PRECISION APCH REQUIRING 1 MI; EVEN THOUGH I APCHED AND LANDED VMC AND HAD MORE THAN 1 MI FLT VISIBILITY. CORRECTION: I SHOULD HAVE LET CTR KNOW RPTED VISIBILITY WAS BELOW MINIMUMS AND REQUESTED TO HOLD VFR UNTIL VISIBILITY IMPROVED AND NOT CONTINUE EVEN THOUGH THE ARPT AND RWY WERE IN SIGHT.