PLT OF CHARTER ROTARY WING CRAFT WRONGLY ASSUMES FLT FOLLOWING WHILE LNDG AS A PRECAUTION AND WAITING FOR VMC TO OCCUR AT Y90.

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DEPARTED PALMER; MA; AT APPROX XA25; VFR FOR AVP. UPON DEP; CONTACTED BDL APCH FOR FLT FOLLOWING. GIVEN SQUAWK AND THOUGHT RADAR CONTACT AFTER IDENT. TRANSITIONED OVER WESTFIELD ON HDG 267 DEGS FROM PALMER BTWN 600-800 FT AGL. ABOUT 5 MI SW OF BARNES; ENCOUNTERED RAIN AND LOWERING VISIBILITY AND CEILINGS. DID A 180 DEG TURN AND INFORMED BDL WOULD PROCEED TO WESTOVER SEEMED CLRER TO THE S. HOWEVER; SINCE I HAD MADE A R-HAND TURN; IT PUT ME CLOSER TO BARNES AFTER RESETTING MY MAP AND NAVAIDS. REQUESTED BARNES AS AN ARPT AND BDL GAVE ME FREQ CHANGE TO TWR 118.9. CONTACTED TWR AND INFORMED CLRED TO LAND. HOWEVER; ARPT WAS IFR AND I WAS ALREADY INSIDE THEIR AIRSPACE. REQUESTED SVFR TO PROCEED. GIVEN CLRNC TO LAND. LANDED WITHOUT INCIDENT. WAITED ABOUT 1 1/2 HRS FOR RAIN TO MOVE THROUGH THEN PROCEEDED VFR TO DEST. TALKED WITH TWR ON PHONE AND THEY HAD NOT RECEIVED HDOF FROM BDL. I BELIEVED THAT I WAS IN RADAR CONTACT WITH BDL SINCE MY DEP FROM PALMER AND HAD NOT HEARD A TERMINATION OF SVC. DID FEEL THAT THE WX HAD GONE TO IFR IN THE RAIN SHOWERS WHICH CAUSED ME TO DO A 180 DEG TURN AROUND TO MAINTAIN MY VFR CONDITIONS. WAS NEVER IN CLOUDS AND HAD VISIBILITY BELOW 4 MI. WAS SURPRISED THAT BARNES WAS IFR SINCE BDL DID NOT ADVISE ME OF THIS CONDITION PRIOR TO TELLING ME TO CONTACT THEM SINCE THEY WERE INFORMED ON INITIAL CONTACT THAT I WAS VFR FOR ADVISORIES ENRTE THROUGH THE AREA.