At least over what we call the Holocene, the warm period since the last ice age, the warming we see now is unprecedented. You would have to go back to previous warm intervals and ask whether this rate of warming was as large then as it is now. Unfortunately, the information we have about the detailed timing of temperature increases in these previous epochs, 100,000 or 200,000 years ago, is inferred from paleo records that don't allow for that kind of timing, but it is the case that the rate of warming we see now and over the last several decades is unprecedented over the Holocene period.
On November 8th, 2018. See this statement in context.