Climate Facts 2017 – The Warmest Non-El Niño Year Ever
White Paper Summary
According to data in January 2018 from the US National Oceanic and Atmospheric Administration (NOAA), the global mean temperature in 2017 over land and sea surfaces exceeded the 20th century average of 13.9°C by 0.84°C. This makes the successive years 2014 to 2017 the four warmest in the measurement series since 1980. Also, 2017 was the third-warmest year, following on from the warmest-ever year of 2016, which was influenced by El Niño. It was also the warmest year without any influence from El Niño, which typically increases the global mean temperature. In this instance, the start of the year saw cool neutral and the end weak La Niña conditions.
On average, the greatest temperature anomalies occurred in central, northern and eastern parts of Asia, where temperatures during the winter and spring were already much too warm. Russia and China registered record high temperatures in the period January to September. It was also too warm in southern regions of North America and in Alaska – reflecting the significant temperature anomalies in the first and last few months of the year. The USA had its third-warmest year, while California experienced its hottest summer with a heatwave in August/September – thus providing one of the prerequisites for the severe forest fires later in the year.
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