THE ACFT CRASHED IN MOUNTAINOUS TERRAIN ON A X-COUNTRY IN BAD WEATHER. THE PLT HAD RECEIVED A WEATHER BRIEFING WHICH HADINCLUDED THE CAUTION THAT VFR FLT WAS NOT RECOMMENDED. ALSO THE ACFT HAD NO RADIO SO THE PLT TOLD THE BRIEFER TO ASSUME HIM OFF AT 1330 HOURS. THE PLT HAD FLOWN THE PROPOSED ROUTE MANY TIMES. THIS TIME THE ACFT WAS REPORTED AS MISSING WHEN IT FAILED TO ARRIVE AT DESTINATION. THE ACFT WAS NOT FOUND UNTIL 6/4/83. THE ACFT HAD IMPACTED THE MOUNTAINOUS TERRAIN IN A WINGS LEVEL 70 DEGREE NOSE LOW ATTITUDE AT HIGH SPEED. IT MADE A CRATER ABOUT 3 FT DEEP. A FAST MOVING FRONT HAD MOVED THROUGH THAT AREA ON THE ACCIDENT DAY AT ABOUT THE PRESUMED TIME OF THE ACCIDENT ACCORDING TO THE DEPUTY SHERIFF WHO IS ALSO A PRIVATE PLT. ABOUT 1/2 INCH OF SNOW FELL IN A SHORT TIME AND IT DID NOT MELT ACCORDING TO THE SHERIFF.