Provisional figures for global average near-surface temperatures confirm that last year, 2017, was the warmest year on record without the influence of warming from El Niño.
When viewed alongside 2015 and 2016 – both of which were dominated by a significant El Niño – last year was the second or third warmest year for annual global temperatures since 1850.
Scientists at the Met Office Hadley Centre and the University of East Anglia's Climatic Research Unit produce the HadCRUT4 dataset, which is used to estimate global temperature.
The HadCRUT4 global temperature series shows that 2017 was 0.99±0.1 °C above pre-industrial levels, taken as the average over the period 1850-1900, and 0.38±0.1 °C above the 1981-2010 average. 2017 is nominally the third warmest year in the HadCRUT4 series. Figures from other global centres place 2017 as second or third warmest.
Read all the details here: https://www.metoffice.gov.uk/news/releases/2018/2017-temperature-announcement