NOAA and NASA released their monthly global temperature analyses for August 2017 this morning. Both showed August was near-record warm for the world, continuing a trend of hot months driven by climate change.
According to NOAA, it was the third-warmest August on record for the world (land and ocean temperatures combined). Only August 2015 and 2016 were warmer in records back to 1880. Some highlights:
August 2017 was 1.49ºF (0.83ºC) above the 20th century average of 60.1ºF (15.6ºC)
Nine of the ten warmest Augusts on record have occurred since 2005
• The global land surface temperature was the second highest on record at 2.11ºF (1.17ºC) above the 20th century average of 56.9ºF (13.8ºC)
• The average global ocean temperature was the fourth warmest on record for August, running 1.28ºF (0.71ºC) above average
• The globe is on track for its second-warmest year on record. Through August, the planet has been 1.58ºF (0.88ºC) above than the 20th century average of 57.3ºF (14.0ºC), the second highest since records began in 1880. Only 2016 was warmer.
NASA also released their global temperature analysis for August 2017, ranking it as the second-warmest August on record. The difference in NASA and NOAA calculations are largely due to how NASA’s measurements are extended to account for temperature changes at the poles, where there are far fewer monitoring stations.
We have combined NASA and NOAA data and compared it to the early industrial average of 1881-1910 as a way to gauge how close the world is to the 2°C warming threshold agreed upon in the 2015 Paris Climate Agreement.. Our calculations show that August 2017 was 1.08ºC (1.94ºF) above that early industrial baseline.
Enclosed are two core graphics for your use:
• Each month’s global temperature anomaly over the last 12 months, with previous months shadowed to the left, using the early industrial baseline
• Year-to-date temperature percentiles through August 2017