SMA SEES DETERIORATING WX; DETERMINES NEED TO LAND IMMEDIATELY. SEES ARPT; LANDS WITHOUT CONTACTING TWR.

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I RECEIVED AN FAA WX BRIEFING AT TETERBORO; NJ; ARPT AT APPROX XA00 AM (LCL TIME) FOR A 1 HR FLT FROM TETERBORO; NJ TO ITHACA; NY. I ASKED FOR AN IFR BRIEFING; BUT THE WX CONDITIONS SOUNDED GOOD ENOUGH FOR A VFR FLT BELOW THE CLOUDS. THE CONDITIONS WERE EXPECTED TO WORSEN IN ITHACA; BUT NOT FOR SEVERAL HRS AFTER THE COMPLETION OF MY FLT. I DEPARTED TETERBORO ABOUT XB30 AM VFR. AS I NEARED ITHACA; THE WX CONDITIONS BEGAN TO RAPIDLY DETERIORATE WITH RAIN AND FOG BEGINNING TO SHROUD THE HILLS AND VALLEYS. BEING UNFAMILIAR WITH THE AREA; I DEEMED IT EXTREMELY IMPORTANT TO LAND IMMEDIATELY. THE ITHACA ARPT CAME INTO VIEW RIGHT IN FRONT OF ME AND I IMMEDIATELY LANDED. I DID NOT TAKE TIME TO CALL THE TWR BECAUSE THAT WOULD HAVE REQUIRED ADDITIONAL TIME AND MANEUVERING; AND I POSSIBLY WOULD HAVE BEEN OUT OF VISUAL REF WITH THE ARPT BY THE TIME COM WAS INITIATED. I REMAINED AT THE ARPT FOR 30 MINS AFTER LNDG AND SAW NO OTHER ACFT LAND; SO I DO NOT BELIEVE THERE WAS A CONFLICT WITH ANOTHER ACFT. I DO NOT KNOW WHAT CORRECTIVE ACTIONS SHOULD BE TAKEN. I AM SURE THE WX BRIEFER GAVE ME THE FACTS AS THEY WERE GIVEN TO HIM. THE WX CONDITION CHANGED RAPIDLY AND I WAS NOT FAMILIAR WITH THE TERRAIN. I FELT THAT THE SAFEST THING FOR MY PAX; MYSELF AND THE PLANE WAS TO GET ON THE GND (IN 1 PIECE). THE OLD ADAGE ESPOUSING 'AVIATE; NAV AND COMMUNICATE' SEEMED APPROPRIATE. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: RPTR STATES HE TALKED TO THE TWR AND THEY WERE NOT TOO HAPPY. THEY WERE POLITE AND STATED THEY WOULD HAVE TO FILE A RPT. RPTR HEARD FROM FAA WHO WANTED MORE INFO AND MENTIONED REMEDIAL TRAINING. RPTR FEELS HIS ACTIONS WERE NECESSARY TO AVOID GETTING CAUGHT IN THE RAPIDLY DETERIORATING WX.