MD80 PIC ATTEMPTS TO TURN OFF THE ACTIVE RWY WHEN WX AND RWY CONDITIONS DID NOT WARRANT A TKOF. ACFT SLIDES OFF THE SIDE OF THE RWY WITH NOSEWHEEL ON THE FROZEN GRASS AREA. FLT CANCELED. PAX DEPLANED.

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ROC; NY; RWY 4/22. BRAKING ACTION FAIR TO POOR. MOST TXWYS AND ALL OTHER RWYS CLOSED WITH 2-6 INCHES SNOW; ICE; AND BLOWING SNOW. CREW LANDED JUST OVER 1 HR EARLIER AND DISCUSSED THE POOR CONDITION OF THE LAST 1/2 - 2/3 OF RWY 22. CREW DISCUSSED WITH GND AND OTHER ACFT THE RWY CONDITION FOR TKOF (IE; WHAT HAD CHANGED SINCE LNDG). AFTER BEING CLRED INTO POS FOR TKOF; AND SEEING FIRST HAND THAT THE RWY CONDITION AND NEARLY 90 DEG XWIND MADE THE RWY UNFIT FOR TKOF; I INFORMED TWR THAT WE WOULD NOT ATTEMPT A TKOF. THEY ASKED IF I COULD MAKE A L TURN TO CLR THE RWY AND I INFORMED THEM THAT I COULD. ALTHOUGH THERE WAS BLOWING SNOW; I COULD CLRLY SEE THE TAXI LIGHTS AND OUTLINE OF THE PREPARED SURFACE. I EASED THE ACFT INTO A L TURN WITH DIFFERENTIAL PWR; COORDINATING BRAKING; AND NOSEWHEEL STEERING. AFTER APPROX 90 DEGS OF TURN; I COULD FEEL THE ACFT SKIDDING ON THE SLUSH AND ICE. I GENTLY APPLIED BRAKING BUT THE COMBINATION OF SLICK CONDITIONS AND A DIRECT TAILWIND CAUSED THE NOSEWHEEL TO BECOME INEFFECTIVE. THE ACFT SLID AT A VERY SLOW SPD; COMING TO A STOP WITH THE NOSEWHEEL APPROX 3 FT ON THE FROZEN GRASS. THERE WERE NO INJURIES AND NO DAMAGE TO THE ACFT. IT WAS FLOWN TO CHICAGO BY THE CREW LATER IN THE DAY.