Tuesday, June 11, 2024

May global surface TempLS down 0.168°C from April, but still warmest May in record.

The TempLS FEM anomaly (1961-90 base) was 1.013°C in May, down from 1.181°C in April. It was still the warmest May in the record, ahead of 0.859°C in 2020. The NCEP/NCAR reanalysis base index fell by 0.044°C.

I'm late posting this month. GHCN data has been slow coming in. I have rules for posting, the most critical is that there be 3800 land stations outside US. But this month there are only 3320 so far. It seems to be a long term change, so there is not much point in waiting longer. The deficit is in just a few countries which were previously very well covered, so it may be by design. Anyway, I'll write a post later today analysing that.

Here is the corresponding stacked graph, showing how much hotter recent months have been:

Here is the temperature map, using the FEM-based map of anomalies. Use the arrows to see different 2D projections.

As always, the 3D globe map gives better detail. There are more graphs and a station map in the ongoing report which is updated daily.

This post is part of a series that has now run since 2011. The TempLS mesh data is reported here, and the recent history of monthly readings is here. Unadjusted GHCN is normally used, but if you click the TempLS button there, it will show data with adjusted, and also with different integration methods. There is an interactive graph using 1981-2010 base period here which you can use to show different periods, or compare with other indices. There is a general guide to TempLS here.

The reporting cycle starts with the TempLS report, usually about the 8th of the month. Then when the GISS result comes out, usually about the 15th, I discuss it and compare with TempLS. The TempLS graph uses the FEM solution on a regular near equal area grid on the sphere ; the residuals are displayed more directly using a triangular grid in a WebGL plot here.

A list of earlier monthly reports of each series in date order is here:

  1. NCEP/NCAR Reanalysis report
  2. TempLS report
  3. GISS report and comparison with TempLS


Post a Comment