The GISS land/ocean temperature anomaly fell 0.12°C in May. The anomaly average was 0.86°C, down from April 0.97°C. It compared with a 0.149°C fall in TempLS V4 mesh. I should note that there were late moves in both indices. GISS' April figure dropped 0.02°C between posting last month and now, making a total drop of 0.13. I note that GISS says that this month is the first using GHCN V4 (other than beta); the change may be part of that. The drop in TempLS is somewhat less than originally posted. I posted that rather early, since all major countries seemed to have coverage, and I got stable results two days in a row. The latter proved illusory, though. A minor nuisance with GHCN V4 is that they keep adding to the inventory. I have resolved to only update it once a month, and this was the first time it had been updated automatically. It didn't quite work; the net result was that my apparent stability was due to data not being updated. It should be OK in future.
The overall pattern was similar to that in TempLS. Warm in most of Asia and Africa. Cool in central Europe and much of the N America (but warm in NW). Arctic warm.
As usual here, I will compare the GISS and previous TempLS plots below the jump. I have now switched from my spherical harmonics based TempLS plots to LOESS based, which gives a more similar resolution.
Skeptical Science New Research for Week #14 2025
2 minutes ago