NOAA released its monthly global temperature analysis for October 2017 this morning.
Over land and ocean surfaces combined, it was the 4th warmest October on record, tied with 2003. Records go back to 1880. Some highlights:
October was 1.31°F (0.73°C) above the 20th century average of 57.1°F (13.9°C)
The three warmest Octobers on record have come in 2014, 2015, and 2016
• The global ocean was the 4th warmest on record for October, even with developing La Niña in the Pacific
• Over land surfaces only, it was the 11th warmest October on record
• The global average temperature over land and ocean surfaces was 1.55°F (0.91°C) above the 20th century average of 57.4°F (13.5°C), the 3rd highest since records began in 1880. Only 2015 and 2016 were warmer.
NOAA calculations resemble the analysis released by NASA earlier this week, indicating that October was the 2nd warmest on record globally. This small difference reflects the fact the NASA’s calculations are extended to account for temperature changes at the poles, where there are far fewer monitoring stations, whereas the NOAA calculations exclude this extrapolation.
To better gauge how much warming has taken place since the early industrial era, and with reference to the 2°C warming threshold agreed upon at the 2015 Paris Climate Summit, we have combined the NASA and NOAA analyses and compared them to a 1881-1910 baseline (enclosed bar chart). Using these calculations indicates that October 2017 was 1.05°C (1.89°F) above that early industrial baseline.
Enclosed are two core graphics, with versions containing no title or background:
• Each month’s global temperature anomaly over the last 12 months, with previous months shadowed to the left
• Year-to-date temperature percentiles through October 2017, with the hottest locations in Spain, eastern China, and the western Pacific