2017 was recorded as the third warmest year in the period 1880 to 2017, only beaten by 2016 and 2015. This was despite the lack of an El Nino, which is believed to have affected the temperatures in the two previous years. The anomaly was around 0.9 C above the average for the period.
Reference: https://www.ncdc.noaa.gov/sotc/global/201713