Tuesday, August 8, 2017

July global surface temperature up 0.11°C

TempLS mesh anomaly (1961-90 base) was up from 0.568°C in June to 0.679°C in July. This follows the smaller rise of 0.06°C in the NCEP/NCAR index, and a similar rise (0.07) in the UAH LT satellite index. The July value is just a whisker short of July 2016, which was a record warm month. With results for Mexico and Peru still to come, that could change..

Again the dominant change was in Antarctica, from very cold in June to just above average in July. On this basis, I'd expect GISS to also rise; NOAA and HADCRUT not so much. Otherwise as with the reanalysis, Middle East and around Mongolia were warm, also Australia and Western USA. Nowhere very hot or cold. Here is the map:

This post is part of a series that has now run for six years. 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.


  1. Nominate Tallbloke's Talkshop for the worst scientific arguments I have ever seen. The guy considered some sort of brilliant mind there, Vaughan, placed e (Euler's number) in an exponent! He did this to "prove" some sort of numerology equivalent. Everyone there seems to be in awe of this incompetent math.

    Is it really even worth discussing anything with these people?

  2. Your map shows a very similar pattern, but lower resolution than the ERAI map for July 2017.

    1. Thanks, Bryan,
      Yes, it is lower resolution. Reanalyses assimilate a lot more data; some of that may be less reliable. I've pushed the resolution as far as I can with GHCN and spherical harmonics, which fit the whole globe. If I push further, I start getting artefacts in places of sparse data. I keep looking for improvements.