This is the update of the progressive year-to-date global average surface temperature, from GISS. This update includes May.
- May was an average of 0.71°C above the 1951-1980 mean.
- April was adjusted back to 0.71°C from 0.75°C
- May this year was equal second hottest with May 2012.
- Every month this year has been at least 0.71°C above the 1951-1980 mean.
- The progressive year to date average up to and including May is 0.77°C above the 1951-1980 mean.
Explaining the chart
The chart is a progressive year to date average for all years from 1995 to the present. What that means is for January each year, it just shows the anomaly for January. For February it shows the average of January and February for each year. For March, its the average of the monthly anomaly from January to March.
If you look at December, each year shows the annual average temperature for the full year. For November, each year has the average for the year up to November, not including December. (As before, I've made it extra large because of all the fine detail.)
|Data Source: NASA GISS|
2015 is still ahead of the pack so far, just ahead of 2010 for this time of the year. The years to watch are 2014, 2010 and 2005. I've plotted them with slightly thicker lines so they stand out more easily.
The coldest year of the lot was 1996, which still ended up more than 0.3°C above the 1950 to 1981 average. The next time someone tries to tell you that "it hasn't warmed since 1996" then show them this chart :)
Related articles and data file
I promised to provide a data file because the chart is so messy. You can access it here on Google drive.
Watching the global thermometer - year to date with April 2015 and the same with YTD to March this year.