DRG ARR, THE FLT WAS HANDED OFF TO WHIDBEY ISLAND APCH CTL AT WHIDBEY ISLAND (NUW) NAVAL AIR STN (NAS). NUW WAS 35 MI NE OF THE DESTN (FAIRCHILD INTL ARPT/CLM), AT PORT ANGELES, WHICH HAD NO OPERG CTL TWR. THE PLT WAS GIVEN THE NUW WX, WHICH WAS 400 SCAT, ESTD 2600' OVC, VIS 6 MI WITH FOG. THE FLT WAS VECTORED TOWARD CLM & WAS CLRD TO DSCND TO THE MIN VECTORING ALT OF 1000' MSL OVER THE STRAITS OF JUAN DE FUCA. THE PLT RPRTD THE ARPT BEACON IN SIGHT & CANCELLED HIS IFR CLNC. THE ACFT WAS OBSERVED TO FLY OVER THE ARPT AT LOW ALT ON A SW HEADING. THE UNICOM OPERATOR ASKED THE PLT FOR A CEILING RPRT, BUT THE PLT REPLIED THAT HE WAS UNABLE TO DETERMINE THE CEILING DUE TO FOG. SUBSEQUENTLY, THE ACFT CRASHEDON RISING TERRAIN ABOUT 2 MI SSW OF THE ARPT, WHILE IN A LEVEL TURN AT AN ELEV OF 1300'. THE 0505 PDT WX AT CLM WAS ESTD 500' BRKN, 4000' OVC, VIS 6 MI WITH FOG. THE CTLR RPRTD THAT ON INITIAL CONTACT WITH THE FLT, THE 0505 WX FOR CLM WAS NOT YET AVAILABLE ON HIS WX VISION SCREEN. THE ARPT ELEV AT CLM WAS 290'.