A319 PLT WAS ASSIGNED TO FLY AN EXHAUSTIVE SCHEDULE AND REFUSED TO FLY THE LAST SEGMENTS DUE TO FATIGUE.

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THIS SAFETY RPT CONCERNS AN ONEROUS PERSONAL SCHEDULE THE AIRLINE DEVELOPED FOR ME. THE COMPANY SCHEDULED ME FOR FLYING DUTY IN 11 OUT OF 12 STRAIGHT DAYS. (2-DAY TRIP; 3-DAY TRIP; 3-DAY TRIP; 3-DAY TRIP.) IN FULL DISCLOSURE; ONE OF MY TURNS WAS PICKED UP BY ONE OF OUR PLT INSTRUCTORS AND I DID NOT FLY THAT DAY. THIS 11 OF 12 DAY SCHEDULE INCLUDED 2 ALL-NIGHT FLTS INSERTED WITHIN THE REST OF THE FLYING. TO PREVENT THIS SCHEDULE FROM GOING ILLEGAL; 2 PERIODS BTWN TRIPS CONTAINED A LAYOVER AND A PERIOD AT HOME BTWN TRIPS OF GREATER THAN 24 HRS. EVEN SO; THIS SCHEDULE WAS 'BARELY LEGAL' CONCERNING 30 IN 7 LIMITS TOWARD THE END OF THE MONTH. AS A SNOWSTORM SLOWED OPS IN ZZZ; I WAS DELAYED JUST ENOUGH TO FORCE A 30 IN 7 SITUATION ON THE FINAL LEG OF MY 12TH DAY OF FLYING. I WAS THEN SCHEDULED TO FLY THE NEXT-TO-LAST LEG OF MY TRIP; THEN DEADHEAD HOME TO AVOID THE 30 IN 7. RATHER THAN DO THAT; I CALLED IN FATIGUED AS I WAS UTTERLY EXHAUSTED. CALLING IN FATIGUED ON THAT LAST TURN COST ME ABOUT 4.5 HRS. I SUSPECT A NUMBER OF PLTS WOULD HAVE GONE AHEAD AND FLOWN THAT FINAL TURN TO AVOID THE PAY PENALTY EVEN THOUGH THEY WERE FATIGUED. A LESS INSANE SCHEDULE WOULD HAVE PREVENTED THIS ENTIRE MESS. THE FACT THAT I MADE IT TO THE LAST DAY OF THIS SCHEDULE BEFORE DROPPING FROM FATIGUE IS A MIRACLE.