According to most estimates, global temperatures in about 272 BCE were not much different from now, and those that do say it was different disagree. Some place it higher, some lower. The two most dramatic from here are the light blue and the red (see here for the full citations), which respectively peg the difference at about 1.5°C higher and 1°C lower then than now.

However, it's critical to remember that these are average temperatures only. Climate patterns were also substantially different then, and we can only conjecture in what way.