The next phase of the Ayrum project was climate, which I'll introduce with the resource that made my work possible in the first place: these datasets created by Nikolai Lofving Hersfeldt, who runs WorldBuildingPasta and shared all of this with my client and me via Panoply. These were tremendously helpful and I wouldn't be able to achieve a fraction of the final detail without them.
My own adjustment to this data begins with Surface Temperature, which came down to correcting the coastlines (I mistakenly sent in a version of the elevation map that resulted in continental shelves appearing above sea level), refining the effects of elevation, and adding a color gradient.
I was then able to combine this data into Annual Minimum, Average, and Maximum temperature maps, seen above, which was pretty useful too.
One use for the Annual Average map, for example, was providing a baseline to compare each month's data against, seen in the sequence above.
And from the Annual Minimum and Maximum maps, I was able to create a map that presents the overall range of temperatures throughout the year, which does a good job of showing just how extreme the conditions are in higher latitudes and further inland.