AN ATX FLC WEATHERVANES DURING THE LNDG ROLLOUT AND LEAVES RWY SURFACE WITHOUT INJURING ANYONE OR DAMAGING THE ACFT.

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FAR 135 FLT WITH 19 PAX AND 2 CREW FROM MOBILE; AL; TO JONESBORO; AR. WX FORECAST TO BE VFR UPON ARR; RECENT FRONTAL PASSAGE; STRONG SURFACE WINDS; INDICATING FORECAST TO BE N-NW APPROX 20-25 KTS; WELL WITHIN ACFT LIMITS. AT JBR ONLY LIGHTED; OPERATING RWY 23. WIND RPTED AT APPROX 300 DEGS AT 17-24 KTS; JBR NOT OPERATING AT THAT HOUR. ON FINAL; UNICOM RPTED 300 DEGS; APPROX 14-20 KTS. ACFT FLT MANUAL HAS NO XWIND 'LIMITATION;' ONLY A RECOMMENDED MAX OF 20 KTS. LNDG WAS ACCOMPLISHED AT 1/2 FLAPS CARRYING VREF +10 KTS; ABOUT 120 KTS. TOUCHDOWN AND ROLLOUT WERE NORMAL. WHILE DECELERATING THROUGH ABOUT 80 KTS; ACFT WEATHERVANED ABOUT 40 DEGS TO THE R. MAX RUDDER L; ADDED BRAKING L; EXTRA REVERSE L; DID NOT CORRECT THE SIT. I DETERMINED ACFT WOULD LEAVE THE PAVED SURFACE; THEREFORE I ALLOWED IT TO PASS BTWN THE RWY LIGHTS AND COME TO REST JUST OFF THE RWY. RECENT RAINS AND LACK OF FREEZING ALLOWED ACFT TO SINK INTO SURFACE ABOUT 6-8 INCHES. ACFT PWR WAS NOT SUFFICIENT TO RETURN TO SURFACE. PAX WERE OFF-LOADED; ACFT WAS PULLED ONTO SURFACE NEXT DAY. NO DAMAGE TO THE ACFT OR PAX OR CREW. 2 SEPARATE MAINT TEAMS INSPECTED ACFT AND FOUND NOTHING WRONG WITH IT.