Tuesday, January 17, 2023


December global surface TempLS up 0.065°C from November.

The TempLS FEM anomaly (1961-90 base) was 0.643°C in December, up from 0.578°C in November. This was only a partial recovery from the steep dro to November. The NCEP/NCAR reanalysis base index rose likewise by 0.105°C.

Continental Europe and N Africa were warm, as was Eastren N America. But there was a large cold region in the W of N America, especially Canada. Cold in central Asia, but warm in much of the Arctic..

Apologies for the lateness of this month's report; I have been away from my computer. But the scripts kept going, on the results page here.

Here is the temperature map, using now the FEM-based map of anomalies.

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 a report of the daily reanalysis index on about the 4th of the month. The next post is this, the TempLS report, usually about the 8th. Then when the GISS result comes out, usually about the 15th, I discuss it and compare with TempLS. The TempLS graph uses a spherical harmonics to the TempLS mesh residuals; the residuals are displayed more directly using a triangular grid in a better resolved 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

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