Yes 1991-2020. It's updated every 10 years. A 30 yr average updated every 10 years with a good database prior to 1991 should have a good sample size in it to capture things on smaller time scales and also some larger time scale features too. For instance we had a hell of a snowy period from the 00s to 2018 or so. But we know in reality, that our long term avg certainly is not supportive of those values during that time.