Every month since March, I've posted a chart of the progressive year-to-date global average surface temperature, from GISS. This is the update with August included. I'll repeat the explanation with each update and add what seem to be things to watch.
Worth noting: Second Hottest August on Record
- August was an average of 0.81°C above the 1951-1980 mean and is the second hottest August on record, after August last year (0.82°C).
- June and July this year were the hottest June and July on record, respectively.
- The highest anomaly this year is now March at 0.91°C, which makes it the second hottest March after March 2010, at 0.93°C and equal with March 2002.
- 2015 is still hottest on record so far, and not showing any sign of dropping.
- The lowest anomalies this year so far were April, now 0.75°C, and July also 0.75°C above the 1951-1980 mean.
- The progressive year to date average up to and including August is 0.81°C above the 1951-1980 mean.
Explaining the chart
The chart is a progressive year to date average, or running mean, 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 tracking above all other years, and not showing any sign of dropping (yet). 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 being 0.35°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 :)
Here is the link to the table for the Year to Date chart.