Dear authors,

I carefully evaluated your response to the reviewer comments and your revised manuscript. While your efforts in addressing the reviewer comments are very much appreciated, I think that your manuscript needs some further, minor revisions before publication:

First, I would like to encourage you to improve your manuscript in highlighting the novelty of your tool and the changes compared to previous versions. You provide a quite extensive discussion of the previous literature on performance metrics in the author’s response, but your paper is rather short on this. I think the reviewer comment clearly shows that there is a need for clarification. So instead of addressing this issue only in the author’s response, I suggest to extend the discussion of previous metrics and differences to your approach in the introduction.

Some technical corrections:

- L 44/45: consider rephrasing „spatial weight“ -> „area weighting“

- L65: This sentence still does not make sense and needs clarification: what is divided by what? Do you mean „… by dividing by the rms value of the corresponding observed variable“?

- L116: What does CG stand for?

- L 232/233: „No matter what kind of masks chosen, the missing points across all variables of one model are the same.“ This sentence needs clarification. Why would you apply the same mask for all variables of one model? Assume an observational temperature time series includes 10% missing data, while an observational ozone time series includes only 1% missing data: Would the tool discard valid data points from the ozone time series?

- L276: „Lighter colors indicate that the model statistics is closer….“

- L327: „… which is calculated using the climatologies…“

- Caption Fig. 7: „There is a red horizontal bar centered at the REF point of which length is as a measure of the observational uncertainty.“ Sentence needs rephrasing, e.g. „The observational uncertainty is indicated by the red horizontal line centered at the REF point.“ Same for the sentence in lines 322/323. And replace „red bar“ by „red line“

Best regards,
Andrea Stenke