<h2>September global surface TempLS down 0.043&deg;C from August.</h2>

The TempLS mesh anomaly (1961-90 base) was 0.758deg;C in September vs 0.801°C in August. This contrasts with the 0.03°C rise in the NCEP/NCAR reanalysis base index. This makes it the second warmest September in the record, just behind 2016.

SST was down somewhat, mainly due to far Southern Ocean. There was also a cool area north of Australia, and in Russia around the Urals. Most of US was warm, except the Pacific coast; E Canada was cool. There were warm areas N of China, in S America E of Bolivia, and Alaska/E Siberia. Africa was warm.

There was a sharp rise of about 0.2°C in satellite indices, which Roy Spencer attributes to stratospheric warming over Antarctica. TempLS found that Antarctica was net cool at surface, although it shows as rather warm on the lat/lon map. As always, the 3D globe map gives better detail.

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

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