Based on analysis of weather station locations from across the globe, NASA has reported that 2017 was the 2nd warmest global average temperature on record, since record-keeping of this particular sort began in 1880*.
In a separate, independent analysis, scientists at the National Oceanic and Atmospheric Administration (NOAA) concluded that 2017 was the 3rd warmest year on their record. The difference in rankings is due to the different methods used by the two agencies to analyze independent readings of global temperatures.
2017 CLIMATE EFFECTS
In 2017, the U.S. experienced 16 weather and climate disasters with losses exceeding $1 billion, and with total costs of approximately $306 billion – a new U.S. annual record. The NOAA credits these increasingly intense wildfires, hurricanes, and more, to the change in global average temperature.
Both analyses show that the five warmest years on record all have taken place since 2010, and both rank 2016 as the warmest year on record. Both also note that 16 of the 17 warmest years on record occurring since 2001. Not only was 2016 the warmest year on record, but eight of the 12 months that make up the year – from January through September, with the exception of June – were the warmest on record for those respective months.
*Accounting for changes in weather station locations and measurement practices change over time, NASA estimates that 2017’s global mean change is accurate to within 0.1 degree Fahrenheit, with a 95 percent certainty level.