Tuesday, March 7, 2023

February global surface TempLS up 0.093°C from January.

The TempLS FEM anomaly (1961-90 base) was 0.749°C in February, up from 0.656°C in January.  That makes it the fifth warmest February in the record. The NCEP/NCAR reanalysis base index rose by 0.088°C.

Almost all of Eurasia was warm, to very warm in NE Russia. Warm in E USA, but cool in the W and cold in NE Canada. Warm in the S Atlantic; neutral in the ENSO region.

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


  1. Nick, I think you've made an arithmetic error in the headline. 0.749 - 0.656 = 0.93 change over January.
    Thanks as always for the fine work you do here.

    1. And thanks for your careful reading, Mark. Yes, a failure of mental arithmetic. Fixed.