Hi, yeah, the shading just reflects how each month performed in that specific year. We don’t display monthly factors anywhere at the moment, but that’s something we could easily add. Just to double-check: by monthly factors, you mean the average return for each month across all years, like the average return for all Februarys?

I’ve also seen people use a seasonal index, like the average return in month X divided by the overall average return. That could be interesting to visualize too.