G200 GULFSTREAM REJECTS THE TKOF AT LAS DUE TO HIGH TEMP AND GROSS WT.

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I WAS SCHEDULED TO FLY 7 PAX FROM LAS TO FRG AND WAS SUPPOSED TO DEPART EARLY MORNING. WE CALCULATED OUR PERFORMANCE FOR THAT TIME AND THERE WERE NO ISSUES. OUR PAX WERE 1 1/2 HRS LATE. WE CALLED FOR TAXI AND GIVEN AN INITIAL CLRNC TO HOLD SHORT OF TXWY H. AT THAT TIME WE WERE TOLD THAT OUR CLRNC HAD DROPPED OUT OF THE SYS AND WE HAD TO REFILE. WE BECAME VERY BUSY AND TASK SATURATED BEFORE TKOF. DURING THE TKOF ROLL AFTER VR; THE AIRPLANE FAILED TO ROTATE EVEN WITH YOKE IN FULL AFT POS. I CALLED FOR AN ABORT AND WE SAFELY BROUGHT ACFT TO A STOP. UPON RETURNING TO THE RAMP. I REALIZED THAT I HAD FAILED TO ACCOUNT FOR THE INCREASE IN TEMP FROM THE TIME WE CALCULATED PERFORMANCE TILL ACTUAL DEP TIME. DURING THAT TIME; THE TEMP HAD INCREASED BY 9 DEGS C. I BELIEVE THERE WERE SEVERAL ISSUES THAT CONTRIBUTED TO THE SITUATION. I HAD USED CURRENT TEMPS INSTEAD OF FORECAST AT ETD. SECOND; WITH THE FLT PLAN DROPPING OUT OF THE SYS; WE AS A CREW BECAME VERY BUSY RE-FILING AND GETTING A NEW CLRNC; WE FAILED TO RE-CALCULATE PERFORMANCE.